Extra attributes in model fields

[sagi s]

I'd like to store extra attributes in the model fields so I can
control the subsequent field-specific behavior from there.

Let's say I have a model that stores metrics I then need to chart.

In the view, I prefer not to have some logic that says:

metrics = Metric.object.all()
create_chart([metric.productivity for metric in metrics], "bar_chart")
create_chart([metric.defects for metric in metrics], "pie_chart")

I'd rather have something like:

for metric_type in Metric.fields:
  create_chart([metric."metric_type" for metric in metrics],
metric."metric_type".chart_type)

The big advantage here is that I can add a new metrics element from
the model without changing the view (Open-Close principle...)

So it would be great if I could do  something like:

class Metric(models.Model):
  productivity = PositiveIntegerField(
verbose_name = "the number of hot dogs we have produced during
that period",
chart_type = "bar_chart"
   )
  ...

However the model rejects fields it does not recognize.

I tried creating my own doctored model to wrap the built-in models:

class _PositiveIntegerField(models.fields.CharField):
def __init__(self, *args, **kwargs):
if "extra_attrs" in kwargs:
self.extra_attrs = kwargs["extra_attrs"]
del kwargs["extra_attrs"]
models.fields.PositiveIntegerField.__init__(self, *args,
**kwargs)

This way I can do:

class Metric(models.Model):
  productivity = _PositiveIntegerField(
verbose_name = "the number of hot dogs we have produced during
that period",
extra_attrs = {'chart_type' : "bar_chart"}
   )
  ...

There are two problems here:
1. I'd need to wrap every field type
2. In the ModelForm I create from this model the type still registers
as the built-in type:

class MetricForm(models.ModelForm):
  class Meta:
model = Metric

>>> mf = MetricForm()
>>> mf.fields['productivity']


Any suggestion as to how to design this right?


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Re: manage.py test without using a database?

[Russell Keith-Magee]

On Wed, Dec 31, 2008 at 7:08 AM, Bo Shi  wrote:
>
> Hi,
>
> One of our django applications does not use django's ORM.  Is there a
> way to run
>
> ./manage.py test my_app
>
> Such that it does not perform test database setup?

There are two ways that you could do this.

The first would be to define a custom test runner that skipped the
database setup phase. django/test/simple/run_tests() will give you a
model for what needs to be in a test runner; take a copy of this
method (removing the database setup portions) and follow the
instructions in [1]

The second approach would be to define a dummy database backend that
didn't complain about a database not being defined.
django/db/backends/dummy gives you a starting point for this.

Either way, you will need to make changes to your settings file.
Neither of these approaches will fall in to the "if I'm only testing
my_app, don't bother setting up the database, otherwise set up the
database as normal" category.

[1] 
http://docs.djangoproject.com/en/dev/topics/testing/#using-different-testing-frameworks

Yours
Russ Magee %-)

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Re: SimpleDB Support

[Russell Keith-Magee]

On Thu, Jan 1, 2009 at 3:21 AM, Travis Reeder  wrote:
>
> I've read some old threads discussing this, but I'm wondering if any
> progress has been made?

There certainly isn't anything official to report. Adding support for
SimpleDB, CouchDB, Google AppEngine, HBase, or any other non-SQL data
source is on the "nice to have" list, but not a current development
priority of the core Django team. For a list of the current
development priorities, see the v1.1 feature list [1]

However, this is a volunteer project - if anyone wants to contribute a
non-SQL data backend, we're only too happy for their contribution. If
integrating a non-SQL backend requires changes to the Django core, we
are willing to entertain any well explained proposal.

[1] http://code.djangoproject.com/wiki/Version1.1Roadmap

Yours,
Russ Magee %-)

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Re: about templatetags

[Russell Keith-Magee]

On Thu, Jan 1, 2009 at 8:18 AM, Alan  wrote:
> Happy new year List!
> So, I have in a project several apps and they basically use the same
> templatetags. I found out by luck that I just need to define it in one
> application, something like:
> app1/
> models.py
> ...
> app2/
> templatetags/mytags.py
> models.py
> ...
> and app1 will use mytags.
> Is my inference right? Well it's working here. If so, why templatetags has
> to be inside apps folder? Why not at the same level of 'template' folder?
> It sounds inconsistent to me, or I am probably missing something here.

Your usage is correct i.e., you only need to define the template tag
once. However, I'm a little confused as to why you see it as
inconsistent.

Templates will tend to be site/project specific, so it makes sense
that templates aren't associated with the individual applications
inside a project. Hence, projects tend to have a top level templates
directory that are independent of the applications in use.

Template Tags, on the other hand, are just blocks of code, so they
need to be reusable. The unit of reusability in Django is the
application. A template tag is defined as being part of App2, but that
is really just a way of getting the template tag registered - it
doesn't limit the places where the template tag can be used.

The possible source of confusion is that there isn't any namespacing
of template tags - there is only the single global templatetag
namespace. Introducing namespaces for template tags is a subject that
gets raised occasionally - search the archives and the ticket database
if you want to see the state of play of that discussion.

Yours,
Russ Magee %-)

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in db/models/query.py - TypeError: 'exceptions.IndexError' object is not callable

[gkelly]

I am having the following error sent to my email from a live site. I
haven't been able to reproduce the error myself, but was hoping
someone could point me in the right direction as to how to solve this.

First of all, is it something in my code, or in Django? The last line
of the traceback says Django, but I think it's probably something I'm
doing.

Any ideas?
Thanks,
Grant


Traceback (most recent call last):

  File "/usr/lib/python2.5/site-packages/django/core/handlers/
base.py", line 86, in get_response
response = callback(request, *callback_args, **callback_kwargs)

  File "/usr/lib/python2.5/site-packages/django/contrib/auth/
decorators.py", line 67, in __call__
return self.view_func(request, *args, **kwargs)

  File "/usr/local/src/wxcoder/observations/views.py", line 160, in
enter
if form.is_valid():

  File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line
120, in is_valid
return self.is_bound and not bool(self.errors)

  File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line
111, in _get_errors
self.full_clean()

  File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line
241, in full_clean
self.cleaned_data = self.clean()

  File "/usr/local/src/wxcoder/observations/forms.py", line 104, in
clean
self.validate()

  File "/usr/local/src/wxcoder/observations/forms.py", line 462, in
validate
]: validator(self.cleaned_data)

  File "/usr/local/src/wxcoder/observations/forms.py", line 257, in
ValidateGrossLimit
e = Element.objects.get(elementID=e_id)

  File "/usr/lib/python2.5/site-packages/django/db/models/manager.py",
line 93, in get
return self.get_query_set().get(*args, **kwargs)

  File "/usr/lib/python2.5/site-packages/django/db/models/query.py",
line 309, in get
% self.model._meta.object_name)

TypeError: 'exceptions.IndexError' object is not callable


,
POST:,
COOKIES:{'__utma':
'145837938.4275713312103283000.1230773473.1230773473.1230773473.1',
 '__utmb': '145837938.47.10.1230773473',
 '__utmc': '145837938',
 '__utmz': '145837938.1230773473.1.1.utmcsr=(direct)|utmccn=(direct)|
utmcmd=(none)',
 'sessionid': '2678e9af381ca6ae35cb0a020b6818fb',
 'username': 'eklutna.waterplant'},
META:{'AUTH_TYPE': None,
 'CONTENT_LENGTH': 0L,
 'CONTENT_TYPE': None,
 'GATEWAY_INTERFACE': 'CGI/1.1',
 'HTTP_ACCEPT': 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/x-shockwave-flash, application/xaml+xml, application/
vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-
application, application/vnd.ms-excel, application/vnd.ms-powerpoint,
application/msword, */*',
 'HTTP_ACCEPT_LANGUAGE': 'en-us',
 'HTTP_CONNECTION': 'Keep-Alive',
 'HTTP_CONTENT_LENGTH': '166',
 'HTTP_CONTENT_TYPE': 'application/x-www-form-urlencoded',
 'HTTP_COOKIE': 'sessionid=2678e9af381ca6ae35cb0a020b6818fb;
__utma=145837938.4275713312103283000.1230773473.1230773473.1230773473.1;
__utmb=145837938.47.10.1230773473; __utmc=145837938;
__utmz=145837938.1230773473.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=
(none); username=eklutna.waterplant',
 'HTTP_HOST': 'wxcoder.org',
 'HTTP_PRAGMA': 'no-cache',
 'HTTP_REFERER': 'http://wxcoder.org/wxcoder/observations/enter/?
date=20081207',
 'HTTP_UA_CPU': 'x86',
 'HTTP_USER_AGENT': 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT
5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR
3.0.04506.30; .NET CLR 3.0.04506.648)',
 'HTTP_VIA': '1.0 AWWUPROX3',
 'PATH_INFO': u'/wxcoder/observations/enter/',
 'PATH_TRANSLATED': None,
 'QUERY_STRING': None,
 'REMOTE_ADDR': '209.112.193.38',
 'REMOTE_HOST': None,
 'REMOTE_IDENT': None,
 'REMOTE_USER': None,
 'REQUEST_METHOD': 'POST',
 'SCRIPT_NAME': '',
 'SERVER_NAME': 'wxcoder.org',
 'SERVER_PORT': 0,
 'SERVER_PROTOCOL': 'HTTP/1.1',
 'SERVER_SOFTWARE': 'mod_python'}>
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Re: Model fields and arrays?

[Greg Schwimer]

On Wed, Dec 31, 2008 at 6:02 AM, bruno desthuilliers <
bruno.desthuilli...@gmail.com> wrote:

>
>
>
> On 31 déc, 05:40, schwim  wrote:
> > I'm trying to build a model that will store the counts of each of 10
> > possible choices, e.g.:
> >
> > v1 = models.IntegerField(default=0)
> > v2 = models.IntegerField(default=0)
> > v3 = models.IntegerField(default=0)
> > ...
> > v10 = models.IntegerField(default=0)
> >
> > I'd prefer to represent this as an array
>
> Where ?
>
> > rather than 10 separate
> > fields.  I looked at the CommaSeparatedIntegerField as an alternative,
> > but I want to explicitly state that there are 10 entries available per
> > instance.
>
> Note that at the Python level, a list (I suppose that's what you mean
> by 'array') is not fixed-length.


Yes, that is what I meant actually. I'm new to python, a perl convert I
guess you could say.


>
>
> If all you want is a way to access the values as a sequence (read-
> only) from your python/templates code, it's just a matter of adding a
> simple property:
>
>
> class YourModel(models.Model):
># you code here
>@property
>def values(self):
>return [getattr(self, "v%s" % i) for i in range(1,11)]
>
>
> then:
>
> m = YourModel.objects.get(...)
> m.values
> m.values[0]
> m.values[9]


Yes, I think this would work nicely actually.  I really only need to access
the values as a list when reading. Writes will be specific.




>
>
>
> If you want a reliable read-write property, this becomes a bit more
> involved. You have to write a custom descriptor returning a custom
> sequence type that retains a reference on the model instance.
>
> The following code should get you started - warning: it's Q, full of
> magic numbers, not generic, not factorized, and not even tested.
> IOW : it's by no mean production code.
>
> class MySequence(object):
>def __init__(self, model):
>self._model = model
>
>def _as_fieldname(self, index):
># sequences are zero-based
># XXX : magic number
>if not 0 <= index <= 9:
>raise IndexError
># your fields are 1-based
># XXX duplicated in MySequenceDescriptor
>return "v%s" % (index+1)
>
>def __getitem__(self, index):
>fname = self._as_fieldname(index)
>return getattr(self._model, fname)
>
>def __setitem__(self, index, value):
>fname = self._as_fieldname(index)
>setattr(self._model, fname, value)
>
># you may need some other sequence __magicmethods__ here
># check the Python's manual about emulating sequence types
>
>
> class MySequenceDescriptor(object):
>def __get__(self, instance, cls):
>if instance is None:
># looked up in the class
>return self
># looked up on a model instance:
>return MySequence(instance)
>
>def __set__(self, instance, value):
># expects a sequence of len(10)
># XXX : magic number
>if len(value) != 10:
>raise ValueError("yadda yadda")
>for index, val in enumerate(value):
># XXX duplication of  MySequence._as_fieldname
>setattr(instance, "v%s" % (index+1), val)
>
>
> class YourModel(models.Model):
># your code here
>
>values = MySequenceDescriptor()
>
> HTH
>
>
Very helpful, yes, thank you.  I think I understand your approach here, but
it's probably more complicated than I need.

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Re: NetBeans IDE for Python

[urlwolf]

actually, it looks like one has to build netbeans from source... not
being a java person, how dif ficult can this be?

I'm trying:
hg clone http://hg.netbeans.org/main/

But it's taking forever. I've gotta sleep; will check tomorrow :)

On Nov 28 2008, 6:48 pm, Ovnicraft  wrote:
> 2008/11/27 itsnotvalid 
>
>
>
> > It says for requesting username as password to access. Did I miss
> > anything here?
>
> try guest:guest
>
>
>
>
>
> > On Nov 27, 11:14 pm, Ovnicraft  wrote:
> > > 2008/11/27 AndyB 
>
> > > > More to the point - has anyone figured out how to! I couldn't even
> > > > find a dowload or repository link for the Django branch.
>
> > > > On Nov 27, 2:21 pm, Robin  wrote:
> > > > > hello,
>
> > > > > I have also installed it and have seen there is this branch:
> > > >http://wiki.netbeans.org/Python#section-Python-DjangoBranch
>
> > > > > anybody has installed this version of the branch ?
>
> > > svn checkouthttps://nbpython.dev.java.net/svn/nbpython/branches/django
>
> > > > > r
>
> > > > > On Nov 20, 8:04 pm, ohmi  wrote:
>
> > > > > > Same results here although other sorts of autocomplete to seem to
> > be
> > > > > > somewhat functional.
> > > > > > No django-specific documentation yet, like how to set up the
> > debugging
> > > > > > environment.
> > > > > > It looks like this stuff is being done according to their roadmap.
>
> > > > > > Could be a great platform, esp. considering the price.
>
> > > > > > O
>
> > > > > > On Nov 20, 5:01 am, lig  wrote:
>
> > > > > > > On 19 нояб, 21:22, Delta20  wrote:
>
> > > > > > > > NetBeans for Python has been released and based on the NB
> > Python
> > > > > > > > roadmap, it looks interesting for those of us working with
> > Django.
> > > > I
> > > > > > > > haven't had much of a chance to play with it yet since it just
> > came
> > > > > > > > out today, but here's the info for anyone interested:
>
> > > > > > > > NetBeans IDE for Python:
> > > >http://download.netbeans.org/netbeans/6.5/python/ea/
> > > > > > > > NB Python Roadmap:http://wiki.netbeans.org/Python
>
> > > > > > > from django.db import models
>
> > > > > > > class Page(models.Model):
> > > > > > >     name    = models. # hitting Ctrl+Space here don't show field
> > type
> > > > > > > suggestions or anything from imported models package
>
> > > --
> > > [b]question = (to) ? be : !be; .[/b]
>
> --
> [b]question = (to) ? be : !be; .[/b]
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tagging in Practical Django Projects

[waltbrad]

Hi there. I'm still reading this book. I have almost all the templates
done for the blog, but I'm stuck on tagging templates.

I noticed that with the link_detail view that the bit of code  {% if
object.tags.count %} was not evaluating to TRUE even though tags were
associated with the object. This resulted in

"This link doesn't have any tags."

appearing on every page for a link detail.  I thought maybe once I
finished the tagging templates I could resolve this, but I don't know
how to call up a URL for a tag so that it will give a list of links or
entries that tag associates.  IOW,  in my tag_list.html file I have
this bit of code:

{% block content %}
 {% for tag in object_list %}
  {{ tag.name }} 
 {% endfor %}
{% endblock %}

This displays the full list of tag names, but I have no idea what
anchor to use on them to get the entries or links by tag.

Sorry if this sounds pretty dumb. But I have been using a few websites
to help me answer questions and problems that crop up, like Hedged
Down,  but none of those websites seem to have encountered this
problem.

Thanks.
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Re: NetBeans IDE for Python

[urlwolf]

Ok, I have checked out the code.
Now, where do I put it? And how do I use it?
I put it inside the netbeans folder, but nothing seems to have
changed. Should I see a 'django project' option anywhere?

Thanks

On Nov 28 2008, 6:48 pm, Ovnicraft  wrote:
> 2008/11/27 itsnotvalid 
>
>
>
> > It says for requesting username as password to access. Did I miss
> > anything here?
>
> try guest:guest
>
>
>
>
>
> > On Nov 27, 11:14 pm, Ovnicraft  wrote:
> > > 2008/11/27 AndyB 
>
> > > > More to the point - has anyone figured out how to! I couldn't even
> > > > find a dowload or repository link for the Django branch.
>
> > > > On Nov 27, 2:21 pm, Robin  wrote:
> > > > > hello,
>
> > > > > I have also installed it and have seen there is this branch:
> > > >http://wiki.netbeans.org/Python#section-Python-DjangoBranch
>
> > > > > anybody has installed this version of the branch ?
>
> > > svn checkouthttps://nbpython.dev.java.net/svn/nbpython/branches/django
>
> > > > > r
>
> > > > > On Nov 20, 8:04 pm, ohmi  wrote:
>
> > > > > > Same results here although other sorts of autocomplete to seem to
> > be
> > > > > > somewhat functional.
> > > > > > No django-specific documentation yet, like how to set up the
> > debugging
> > > > > > environment.
> > > > > > It looks like this stuff is being done according to their roadmap.
>
> > > > > > Could be a great platform, esp. considering the price.
>
> > > > > > O
>
> > > > > > On Nov 20, 5:01 am, lig  wrote:
>
> > > > > > > On 19 нояб, 21:22, Delta20  wrote:
>
> > > > > > > > NetBeans for Python has been released and based on the NB
> > Python
> > > > > > > > roadmap, it looks interesting for those of us working with
> > Django.
> > > > I
> > > > > > > > haven't had much of a chance to play with it yet since it just
> > came
> > > > > > > > out today, but here's the info for anyone interested:
>
> > > > > > > > NetBeans IDE for Python:
> > > >http://download.netbeans.org/netbeans/6.5/python/ea/
> > > > > > > > NB Python Roadmap:http://wiki.netbeans.org/Python
>
> > > > > > > from django.db import models
>
> > > > > > > class Page(models.Model):
> > > > > > >     name    = models. # hitting Ctrl+Space here don't show field
> > type
> > > > > > > suggestions or anything from imported models package
>
> > > --
> > > [b]question = (to) ? be : !be; .[/b]
>
> --
> [b]question = (to) ? be : !be; .[/b]

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Re: specify alternative settings.py file at startup

[Russell Keith-Magee]

On Wed, Dec 31, 2008 at 11:45 AM, dick...@gmail.com  wrote:
>
> i'm confused on the --settings option on manage.py.
>
> if i have a project call foo, i'd have in ./foo/settings.py
>
> to run: python manage.py runserver 8080
>
> let's say i have a bar.settings.py which contains different values
> (like test database to use or something), i'm trying to run:
>
> python manage.py runserver --settings=bar.settings 8080 (and maybe
> combintations of), but keep getting some derivations of: "Could Not
> Import settings...is it on the sys.path, no module named bar.settings.

The cause of the confusion here is the name of your settings file.
Python uses dot notation to specify module hierarchies. When you
specify bar.settings, Python expects to find a directory named bar
with a file called settings.py in that directory.

If you rename your settings file bar_settings.py (or something else
that is compatible with Python module naming) you should stop getting
the error you report.

Yours,
Russ Magee %-)

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about templatetags

[Alan]

Happy new year List!
So, I have in a project several apps and they basically use the same
templatetags. I found out by luck that I just need to define it in one
application, something like:

app1/
models.py
...

app2/
templatetags/mytags.py
models.py
...

and app1 will use mytags.

Is my inference right? Well it's working here. If so, why templatetags has
to be inside apps folder? Why not at the same level of 'template' folder?
It sounds inconsistent to me, or I am probably missing something here.

Many thanks in advance.

-- 
Alan Wilter S. da Silva, D.Sc. - CCPN Research Associate
Department of Biochemistry, University of Cambridge.
80 Tennis Court Road, Cambridge CB2 1GA, UK.
>>http://www.bio.cam.ac.uk/~awd28<<

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Outdated data in django page rendering w/ cacheing disabled

[Malinka]

I have a django project which will be taking data from a db that is
already being managed and maintained by another set of programs and
read it and display it for reporting and for determineing possible
problems and then in some cases making changes back into the system
through other means (not by making changes to db)

I have created a set of functions and classes to connect to the db and
request the data and then display the data rendered as a page, however
what I'm finding is that when the data is being changed from the main
set of applications connecting to and using this db and then i refresh
my browser django is still displaying old data in some cases, now I've
looked through all the cacheing documentation and as far as I can find
I've disabled all cacheing and I know it's not the browsers' cacheing
because when I telnet and request the pages it's comeing back as the
old data not the new data, and if I run the python code outside of
django just to output the data I'm passing into the templates it's
updating timely

in my views.py for the particular pages in question I have

from django.views.decorators.cache import never_cache

@never_cache
def index(request):

before every function for rendering data

in my settings.py I have

MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
)

TEMPLATE_LOADERS = (
'django.template.loaders.filesystem.load_template_source',
)

I removed every thing that I thought wasn't needed for this situation
to make sure there isn't anything I'm missing that could cause this

As far as I can tell there is no reason for this data to be outdated
on browser refresh, I've tried looking through the documentation and
other places to find what could be causing this

Any Ideas?

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Re: FormWizard: Setting up a ChoiceField.choices based on previous forms,

[David Durham, Jr.]

On Tue, Dec 30, 2008 at 3:16 PM, Ariel Mauricio Nunez Gomez
 wrote:
> Hello list,
> Today I started using FormWizard and could not find a clean way to populate
> a choices field based on previously submitted forms, I ended up overriding
> the render method like this(The only changed line is the one highlited):



If you're doing a lot of FormWizard work, maybe take a look at the
Session-based FormWizard I wrote and give me some feedback.

   http://code.djangoproject.com/ticket/9200

It sounds like you have a reasonable solution to your issue, but I
thought I'd go ahead and solicit some feedback anyway, and maybe this
class I wrote could benefit you some.

Thanks,
Dave

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Re: ROOT_URLCONF

[Daniel Roseman]

On Dec 31, 12:31 pm, "dick...@gmail.com"  wrote:
> was looking for some info on how ROOT_URLCONF setting is supposed to
> be used? i am trying something very simple. i have a single django
> project. there are two apps.
>
> i want to run one app, call it foo,  with a specific settings file,
> and set of urls, and bar with something else.
>
> so, with a    myproject/settings.py, myproject/bar-settings.py,
> myproject/urls.py , myproject/bar-urls.py
>
> bar-settings.py has ROOT_URLCONF=myproject.bar-urls
> everything works great with the foo (default project).
>
> now to run the "bar" project, i start it: python manage.py runserver --
> settings=bar-settings
>
> the error i get is, after i hit a url (everything starts up fine):
>
> File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
> core/urlresolvers.py", line 246, in resolve
>     return get_resolver(urlconf).resolve(path)
>   File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
> core/urlresolvers.py", line 179, in resolve
>     for pattern in self.urlconf_module.urlpatterns:
>   File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
> core/urlresolvers.py", line 198, in _get_urlconf_module
>     self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])
> ImportError: No module named bar

I think your problem is that 'bar-settings' is not a valid identifier
in Python. You can't use a hyphen in names of variables or modules.
Try calling them bar_settings etc, and see if that works.
--
DR.
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[job] freelance django developer needed

[derek73]

We are currently looking for a Django developer or two to join us on a
freelance basis. Our "mission", replyforall.com, is ready for the next
phase and we're looking for some additional developer bandwidth to
help us take it there.

Our current need is more slanted towards a backend web developer/
engineer. Depending on your skills, we'll probably start you off with
some customized reporting in the django admin to see how things work
out and then ask for more site-specific work once you become more
familiar with our project and we see where your skills are.

This is telecommute/work from home, so you should be able to work
independently, but also be able to demonstrate effective people and
time management skills, so as to deliver work within our deadlines.

Location is pretty irrelevant as long as you have decent Internet
access, chat and email. Our current team includes people from New
York, San Francisco, Portland and Argentina.

If you're interested please send us your daily/hourly rates, your
availability as well as a few words about your programming background
and experience with Django.

We'll also need samples/URLs of past projects, completed or still
pending.

Any questions? Feel free to email me.

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Re: Using ModelChoiceField with query set - no error but no list either

[phoebebright]

Thanks that makes sense.  I'll give it go.

Happy New Years

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SimpleDB Support

[Travis Reeder]

I've read some old threads discussing this, but I'm wondering if any
progress has been made?

Cheers,
Travis


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Re: form validation does not work

[Chuck22]

Thanks for the reference. The problem is solved with this code
modification:

def contact(request):
if request.method == 'POST':
f = ContactForm(request.POST)
if f.is_valid():
email = f.cleaned_data['email']
... #send email
return HttpResponseRedirect(reverse('contact_success'))
   else:
 f=ContactForm()

   return render_to_response(
'post_contact.html',
{ 'form':f },
context_instance = RequestContext(request)
)



On Dec 31, 12:36 pm, Daniel Roseman 
wrote:
> On Dec 31, 12:18 am, Chuck22  wrote:
>
>
>
>
>
> > class ContactForm(forms.Form):
> >           email = forms.EmailField(required=True,
> >                              widget=forms.TextInput(attrs=
> > {'size':'30'}),
> >                             error_messages={'required':'Please fill
> > out your Email'})
> >           ...
>
> > in my form html file:
> > ...
> > label for="id_full_name">Your email address
> >             {{ form.email.errors }}
> >             {{ form.email }}
> > ...
>
> > in my view:
> > def contact(request):
> >     if request.method == 'POST':
> >         f = ContactForm(request.POST)
> >         if f.is_valid():
> >             email = f.cleaned_data['email']
> >             ...
> >             return HttpResponseRedirect(reverse('contact_success'))
>
> > When user submit the contact form without fill out email field, the
> > form get submitted without displaying error message 'Please fill out
> > your Email'. Instead, I got error: The view app.views.contact didn't
> > return an HttpResponse object.
>
> > it seems f.is_valud return false, which is correct. But I think form
> > validation should kick in at this point and return error message to
> > {{ form.email.errors }} field in template. Why doesn't the validation
> > work? Did I miss anything?
>
> As Alex says, we'll need to see the full view function to really help.
> But assuming the last line what you've posted is actually the last
> line of the function, you are indeed missing something - the code to
> return something if the form fails validation.
>
> The error message you've posted tells you exactly what's happening -
> your view is not returning an HttpResponse. It's always your
> responsibility to do this - Django won't ever do something by default
> (except 404 and 500 errors). Look more closely at the example given in
> the 
> documentation:http://docs.djangoproject.com/en/dev/topics/forms/#using-a-form-in-a-...
> You'll see that in that view, the return at the end is called in both
> the case of the initial GET, and if the POST failed validation.
> --
> DR.- Hide quoted text -
>
> - Show quoted text -
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Re: form validation does not work

[Daniel Roseman]

On Dec 31, 12:18 am, Chuck22  wrote:
> class ContactForm(forms.Form):
>           email = forms.EmailField(required=True,
>                              widget=forms.TextInput(attrs=
> {'size':'30'}),
>                             error_messages={'required':'Please fill
> out your Email'})
>           ...
>
> in my form html file:
> ...
> label for="id_full_name">Your email address
>             {{ form.email.errors }}
>             {{ form.email }}
> ...
>
> in my view:
> def contact(request):
>     if request.method == 'POST':
>         f = ContactForm(request.POST)
>         if f.is_valid():
>             email = f.cleaned_data['email']
>             ...
>             return HttpResponseRedirect(reverse('contact_success'))
>
> When user submit the contact form without fill out email field, the
> form get submitted without displaying error message 'Please fill out
> your Email'. Instead, I got error: The view app.views.contact didn't
> return an HttpResponse object.
>
> it seems f.is_valud return false, which is correct. But I think form
> validation should kick in at this point and return error message to
> {{ form.email.errors }} field in template. Why doesn't the validation
> work? Did I miss anything?

As Alex says, we'll need to see the full view function to really help.
But assuming the last line what you've posted is actually the last
line of the function, you are indeed missing something - the code to
return something if the form fails validation.

The error message you've posted tells you exactly what's happening -
your view is not returning an HttpResponse. It's always your
responsibility to do this - Django won't ever do something by default
(except 404 and 500 errors). Look more closely at the example given in
the documentation:
http://docs.djangoproject.com/en/dev/topics/forms/#using-a-form-in-a-view
You'll see that in that view, the return at the end is called in both
the case of the initial GET, and if the POST failed validation.
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Re: form validation does not work

[Chuck22]

def contact(request):
if request.method == 'POST':
f = ContactForm(request.POST)
if f.is_valid():
email = f.cleaned_data['email']
... #send email
return HttpResponseRedirect(reverse('contact_success'))
   else:
 f=ContactForm()
 return render_to_response(
'post_contact.html',
{ 'form':f },
context_instance = RequestContext(request)
)

I am still workong on the view code to send email when users submit
the form. The problem is that required field did not validate and
block the form submission. User is able to submit the form without
providing email which is a required field.

On Dec 31, 1:50 am, "Alex Koshelev"  wrote:
> Please post here entire view code
>
>
>
> On Wed, Dec 31, 2008 at 8:18 AM, Chuck22  wrote:
>
> > class ContactForm(forms.Form):
> >          email = forms.EmailField(required=True,
> >                             widget=forms.TextInput(attrs=
> > {'size':'30'}),
> >                            error_messages={'required':'Please fill
> > out your Email'})
> >          ...
>
> > in my form html file:
> > ...
> > label for="id_full_name">Your email address
> >            {{ form.email.errors }}
> >            {{ form.email }}
> > ...
>
> > in my view:
> > def contact(request):
> >    if request.method == 'POST':
> >        f = ContactForm(request.POST)
> >        if f.is_valid():
> >            email = f.cleaned_data['email']
> >            ...
> >            return HttpResponseRedirect(reverse('contact_success'))
>
> > When user submit the contact form without fill out email field, the
> > form get submitted without displaying error message 'Please fill out
> > your Email'. Instead, I got error: The view app.views.contact didn't
> > return an HttpResponse object.
>
> > it seems f.is_valud return false, which is correct. But I think form
> > validation should kick in at this point and return error message to
> > {{ form.email.errors }} field in template. Why doesn't the validation
> > work? Did I miss anything?- Hide quoted text -
>
> - Show quoted text -
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ROOT_URLCONF

[dick...@gmail.com]

was looking for some info on how ROOT_URLCONF setting is supposed to
be used? i am trying something very simple. i have a single django
project. there are two apps.

i want to run one app, call it foo,  with a specific settings file,
and set of urls, and bar with something else.

so, with amyproject/settings.py, myproject/bar-settings.py,
myproject/urls.py , myproject/bar-urls.py

bar-settings.py has ROOT_URLCONF=myproject.bar-urls
everything works great with the foo (default project).

now to run the "bar" project, i start it: python manage.py runserver --
settings=bar-settings

the error i get is, after i hit a url (everything starts up fine):

File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
core/urlresolvers.py", line 246, in resolve
return get_resolver(urlconf).resolve(path)
  File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
core/urlresolvers.py", line 179, in resolve
for pattern in self.urlconf_module.urlpatterns:
  File "/Users/rich/devtools/jython-dev/dist/Lib/site-packages/django/
core/urlresolvers.py", line 198, in _get_urlconf_module
self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])
ImportError: No module named bar



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Re: Model fields and arrays?

[Daniel Roseman]

On Dec 30, 11:40 pm, schwim  wrote:
> I'm trying to build a model that will store the counts of each of 10
> possible choices, e.g.:
>
>     v1 = models.IntegerField(default=0)
>     v2 = models.IntegerField(default=0)
>     v3 = models.IntegerField(default=0)
>     ...
>     v10 = models.IntegerField(default=0)
>
> I'd prefer to represent this as an array rather than 10 separate
> fields.  I looked at the CommaSeparatedIntegerField as an alternative,
> but I want to explicitly state that there are 10 entries available per
> instance.
>
> Any suggestions on how this can be done, or perhaps a better way to
> solve this puzzle?

I have a snippet here:
http://www.djangosnippets.org/snippets/1200/
which defines a custom model field and accompanying form field to
store a list of values. It doesn't currently have an option to set a
maximum number of items in the model field, just in the form field,
but that could probably be added fairly easily.
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Re: Using ModelChoiceField with query set - no error but no list either

[Daniel Roseman]

On Dec 31, 11:13 am, phoebebright  wrote:
> I have a model that has a car and a car has a foreign key to carmodel
> via the field model  (too many models!)
>
> This is the line for the form which appears to run:
>
> carmodel=forms.ModelChoiceField(queryset=Car.objects.all().values
> ('model','model__name').distinct() )
>
> It generates the correct SQL
>
> SELECT DISTINCT `carpoint_car`.`model_id`, `carpoint_carmodel`.`name`
> FROM `carpoint_car` INNER JOIN `carpoint_carmodel` ON
> (`carpoint_car`.`model_id` = `carpoint_carmodel`.`id`)
>
> and if I run this manually I get 6 records returned:
>
> 6       Galaxy
> 7       Bigun
> 8       Touring
> 9       Espace
> 10      D1
> 11      Tank
>
> But I don't get the form being displayed.  If I remove this line the
> form displays okay.
>
> What pattern is ModelChoiceField expecting in the queryset to know
> what fields to use to generate a choice from?

You don't need the values() part. Django will use the id and the
__unicode__ method or a normal queryset to generate the choices. If
you want something different, use a standard integer field with a
Select widget, and populate the choices manually.
--
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Re: Calendar

[Karen Tracey]

On Wed, Dec 31, 2008 at 9:35 AM, Mario  wrote:

>
> Karen,
>
> Can you provide me an example of the widget implementation?
>

Sorry, I am not sure what you are asking for.  Someone said (I thought) that
they wanted to have calendar inputs like the admin uses, only in their own
pages, so I pointed to the doc that mentions where the admin widgets are
located in the django source tree.  They then said they "do now" (I assume
that was meant to be "do not") want to use a widget, so I am not sure what
the original question was asking for.  The admin uses custom widgets, if you
don't want to use widgets than you don't really want what the admin uses
(and you're apparently not using Django forms, since Django forms use
widgets?).  Perhaps the objection to the admin widgets is that they use
javascript, I'm not sure, since the response to my pointing to the doc was
not at all clear to me.

Anyway, if you want calendar inputs like the admin uses, it should be fairly
straightforward to re-use the admin widgets that the doc mentions in your
own pages, though you may need to look at the source to get the right names
to specify for the widgets, I don't see that the doc details that.
Personally I have not done this myself and don't have time at the moment to
do any more with it than point at the existing doc.

Karen


>
> On Dec 30, 9:30 am, "Karen Tracey"  wrote:
> > On Tue, Dec 30, 2008 at 7:51 AM, Praveen  >wrote:
> >
> >
> >
> > > Hi All,
> > > I want to use calendar in my html template as the default admin
> > > interface uses.
> >
> > http://docs.djangoproject.com/en/dev/topics/forms/media/#form-media
> >
> > Karen
> >
>

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Using ModelChoiceField with query set - no error but no list either

[phoebebright]

I have a model that has a car and a car has a foreign key to carmodel
via the field model  (too many models!)

This is the line for the form which appears to run:

carmodel=forms.ModelChoiceField(queryset=Car.objects.all().values
('model','model__name').distinct() )

It generates the correct SQL

SELECT DISTINCT `carpoint_car`.`model_id`, `carpoint_carmodel`.`name`
FROM `carpoint_car` INNER JOIN `carpoint_carmodel` ON
(`carpoint_car`.`model_id` = `carpoint_carmodel`.`id`)

and if I run this manually I get 6 records returned:

6   Galaxy
7   Bigun
8   Touring
9   Espace
10  D1
11  Tank


But I don't get the form being displayed.  If I remove this line the
form displays okay.

What pattern is ModelChoiceField expecting in the queryset to know
what fields to use to generate a choice from?


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Re: Calendar

[Mario]

Karen,

Can you provide me an example of the widget implementation?

_Mario

On Dec 30, 9:30 am, "Karen Tracey"  wrote:
> On Tue, Dec 30, 2008 at 7:51 AM, Praveen 
> wrote:
>
>
>
> > Hi All,
> > I want to use calendar in my html template as the default admin
> > interface uses.
>
> http://docs.djangoproject.com/en/dev/topics/forms/media/#form-media
>
> Karen
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Re: Installing Django 1.0.2...

[Karen Tracey]

On Wed, Dec 31, 2008 at 9:20 AM, Peter  wrote:

>
> Python cannot find django/utils/version.py. Usually everything needed
> for
> to run django (which is everything in the 'django' folder) is put
> under the folder 'site-packages'
> in your pythin installation. AFAIK simply copying C:\Django-1.0.2-final
> \django to site-packages\django
> should work.
>

The command that is failing here is "python setup.py install".  It should
not be necessary to copy anything to site-packages prior to running the
install command.

Karen


> -- Peter
>
> On Dec 31, 8:46 am, mic  wrote:
> > I am a first time python/django user..
> >
> > Running "python setup.py install" from django-1.0.2-final directory
> > gives me this error
> >
> > Traceback (most recent call last):
> >   File "setup.py", line 69, in 
> > version = __import__('django').get_version()
> >   File "C:\Django-1.0.2-final\django\__init__.py", line 13, in
> > get_version
> > from django.utils.version import get_svn_revision
> > ImportError: No module named utils.version
> >
> > Any ideas on what I am missing?
> >
> > Thanks
> >
> > Mic
> >
>

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Re: Installing Django 1.0.2...

[Peter]

Python cannot find django/utils/version.py. Usually everything needed
for
to run django (which is everything in the 'django' folder) is put
under the folder 'site-packages'
in your pythin installation. AFAIK simply copying C:\Django-1.0.2-final
\django to site-packages\django
should work.

-- Peter

On Dec 31, 8:46 am, mic  wrote:
> I am a first time python/django user..
>
> Running "python setup.py install" from django-1.0.2-final directory
> gives me this error
>
> Traceback (most recent call last):
>   File "setup.py", line 69, in 
>     version = __import__('django').get_version()
>   File "C:\Django-1.0.2-final\django\__init__.py", line 13, in
> get_version
>     from django.utils.version import get_svn_revision
> ImportError: No module named utils.version
>
> Any ideas on what I am missing?
>
> Thanks
>
> Mic
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Re: Installing Django 1.0.2...

[Karen Tracey]

On Wed, Dec 31, 2008 at 3:36 AM, mic  wrote:

>
> I am a first time python/django user
>
> running "python setup.py install" gives me this error
>
> Traceback (most recent call last):
>  File "setup.py", line 69, in 
>version = __import__('django').get_version()
>  File "C:\Django-1.0.2-final\django\__init__.py", line 13, in
> get_version
>from django.utils.version import get_svn_revision
> ImportError: No module named utils.version
>
> Any help is appreciated.
>
> Thanks for the help.
>

That's odd. Do you have the files:

C:\Django-1.0.2-final\django\utils\__init__.py
C:\Django-1.0.2-final\django\utils\version.py

If not, something has gone wrong with unpacking the 1.0.2 tarfile because
those files are in it.

If you do have those files, what version of Python are you using?

Karen

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Re: Inline problem in Postgres but not MySQL

[Peter]

I just installed 1.0.2 final and the bug has been fixed in that.

-- Peter
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Re: Writing your first Django app

[johan]

Thank you for the response. Good explanation Briel.

Turned out I was loading the wrong URL but start to get an understanding for
how Django works now. (I think!)



 till Django
2008/12/29 Briel 

>
> The quick answer:
> This goes into views.py (copied from the tutorial).
>
> def detail(request, poll_id):
>return HttpResponse("You're looking at poll %s." % poll_id)
>
> Now to understand what happens a bit better:
> In your views.py file you can make as many "def something(request):"
> as you like. This is where you write your code to handle what or how
> you'll make some http response. In your urls.py you write what model
> in your views.py need to handle what urls. So when you write an url,
> Django will find out if that is a valid url, comparing to the urls you
> have in your urls.py file(s). If there is a match, then it will run
> the model in your views file.
>
> In the code from the tutorial, 'mysite.polls.views.detail' will run
> the above code, if it's written in the views.py in your polls app. It
> returns a simple http response, a text string: "You're looking at poll
> %s." % poll_id. The poll_id varible is gotten from the url.
>
> -Briel
>
>
> johan skrev:
> > yes of course my bad!
> >
> > http://docs.djangoproject.com/en/dev/intro/tutorial03/#intro-tutorial03
> >
> >
> >
> > 2008/12/29 Abdel Bolanos Martinez 
> >
> > >  send me the url of the tutorial  where you are, now!!!
> > >
> > >
> > > On Mon, 2008-12-29 at 06:19 -0800, kallep wrote:
> > >
> > > that was a fast reply :)
> > >
> > > In  part 3 I do not understand if I'm suppose to create a new view
> > > called detail.py or if this code should be in to the views.py. The
> > > problem is that I cant load the detail page or even figure out if I'm
> > > supposed to be able to do that. I do not know what I'm building here!
> > >
> > > On Dec 29, 10:02 pm, Abdel Bolanos Martinez 
> > > wrote:
> > > > what you have just done until now ???
> > > >
> > > > On Mon, 2008-12-29 at 05:52 -0800, kallep wrote:
> > > > > This is my first question here.  I find it extremely difficult to
> > > > > follow the "Writing your first Django app tutorial".  I'm  now
> stocked
> > > > > on the third part. Is it possible to see the finished source code
> > > > > somewhere?   The main difficulty is to understand what code are
> > > > > supposed to go where.
> > > >
> > > > Abdel Bola�os Mart�nez
> > > > Ing. Inf�rmatico
> > > > Telf. 266-8562
> > > > 5to piso, oficina 526, Edificio Beijing, Miramar Trade Center. ETECSA
> > >
> > >
> > >
> > >
> > > Abdel Bola�os Mart�nez
> > > Ing. Inf�rmatico
> > > Telf. 266-8562
> > > 5to piso, oficina 526, Edificio Beijing, Miramar Trade Center. ETECSA
> > > >
> > >
>
> >
>

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Re: Model fields and arrays?

[bruno desthuilliers]

On 31 déc, 05:40, schwim  wrote:
> I'm trying to build a model that will store the counts of each of 10
> possible choices, e.g.:
>
> v1 = models.IntegerField(default=0)
> v2 = models.IntegerField(default=0)
> v3 = models.IntegerField(default=0)
> ...
> v10 = models.IntegerField(default=0)
>
> I'd prefer to represent this as an array

Where ?

> rather than 10 separate
> fields.  I looked at the CommaSeparatedIntegerField as an alternative,
> but I want to explicitly state that there are 10 entries available per
> instance.

Note that at the Python level, a list (I suppose that's what you mean
by 'array') is not fixed-length.

At the relational (SQL) level, you could use a joined table storing
values (yourmodel_id, numchoice, value) with yourmodel_id + numchoice
as primary key (or, given Django's ORM limitation, using a unique
(yourmodel_id, numchoice) constraint), but you'll have to add your own
validation stuff (both at the database level and Django code level) to
make sure numchoice is between 1 and 10. Now weither this is the right
thing to do depends on the probabilities that you will want more than
10 "values" anytime soon. if this requirement is really stable, your
current solution is ok to me (purist DBAs would probably run away
screaming, but that's another problem).

If all you want is a way to access the values as a sequence (read-
only) from your python/templates code, it's just a matter of adding a
simple property:


class YourModel(models.Model):
# you code here
@property
def values(self):
return [getattr(self, "v%s" % i) for i in range(1,11)]


then:

m = YourModel.objects.get(...)
m.values
m.values[0]
m.values[9]


If you want a reliable read-write property, this becomes a bit more
involved. You have to write a custom descriptor returning a custom
sequence type that retains a reference on the model instance.

The following code should get you started - warning: it's Q, full of
magic numbers, not generic, not factorized, and not even tested.
IOW : it's by no mean production code.

class MySequence(object):
def __init__(self, model):
self._model = model

def _as_fieldname(self, index):
# sequences are zero-based
# XXX : magic number
if not 0 <= index <= 9:
raise IndexError
# your fields are 1-based
# XXX duplicated in MySequenceDescriptor
return "v%s" % (index+1)

def __getitem__(self, index):
fname = self._as_fieldname(index)
return getattr(self._model, fname)

def __setitem__(self, index, value):
fname = self._as_fieldname(index)
setattr(self._model, fname, value)

# you may need some other sequence __magicmethods__ here
# check the Python's manual about emulating sequence types


class MySequenceDescriptor(object):
def __get__(self, instance, cls):
if instance is None:
# looked up in the class
return self
# looked up on a model instance:
return MySequence(instance)

def __set__(self, instance, value):
# expects a sequence of len(10)
# XXX : magic number
if len(value) != 10:
raise ValueError("yadda yadda")
for index, val in enumerate(value):
# XXX duplication of  MySequence._as_fieldname
setattr(instance, "v%s" % (index+1), val)


class YourModel(models.Model):
# your code here

values = MySequenceDescriptor()

HTH

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Installing Django 1.0.2...

[mic]

I am a first time python/django user

running "python setup.py install" gives me this error

Traceback (most recent call last):
  File "setup.py", line 69, in 
version = __import__('django').get_version()
  File "C:\Django-1.0.2-final\django\__init__.py", line 13, in
get_version
from django.utils.version import get_svn_revision
ImportError: No module named utils.version

Any help is appreciated.

Thanks for the help.

Madhav

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Installing Django 1.0.2...

[mic]

I am a first time python/django user..

Running "python setup.py install" from django-1.0.2-final directory
gives me this error

Traceback (most recent call last):
  File "setup.py", line 69, in 
version = __import__('django').get_version()
  File "C:\Django-1.0.2-final\django\__init__.py", line 13, in
get_version
from django.utils.version import get_svn_revision
ImportError: No module named utils.version

Any ideas on what I am missing?

Thanks

Mic

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Re: Model fields and arrays?

[raj]

I too checking for similar thing. Need to store a list of integers/
floats in the model. When we find existing form fields as inadequate,
we can define our own fields. What about following the same way here
for model fields too?

On Dec 31, 9:40 am, schwim  wrote:
> I'm trying to build a model that will store the counts of each of 10
> possible choices, e.g.:
>
>     v1 = models.IntegerField(default=0)
>     v2 = models.IntegerField(default=0)
>     v3 = models.IntegerField(default=0)
>     ...
>     v10 = models.IntegerField(default=0)
>
> I'd prefer to represent this as an array rather than 10 separate
> fields.  I looked at the CommaSeparatedIntegerField as an alternative,
> but I want to explicitly state that there are 10 entries available per
> instance.
>
> Any suggestions on how this can be done, or perhaps a better way to
> solve this puzzle?
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Re: Getting SQL from QuerySet

[Matías Costa]

On Tue, Dec 30, 2008 at 9:11 PM, Info Cascade
 wrote:
>
> Hi --
>
> I am getting intermittent errors on certain database queries on our
> production server.
> I am having a hard time duplicating them (most of the time they run
> okay, only sometimes on the production server am I receiving exception
> messages),
> so I want to log the SQL query itself and see what it is, and why it
> might be failing.

The Django Debug Toolbar does that and much more

http://rob.cogit8.org/blog/2008/Sep/19/introducing-django-debug-toolbar/

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