date:20131009

Re: Extension to QuerySet.values()

2013-10-09 Thread Russell Keith-Magee

Hi Arnaud,

I can see value in the feature you're describing here.

>From a design perspective, my question would be whether a whole new method
is needed, or whether it could be integrated into the existing values()
method. There will be some complications around the 'flat' key, but its
worth exploring the possibilities before we introduce a whole new API entry
point.

If you're interested in taking this to the next level, we'll need tests and
documentation for the new feature. If you want to discuss finer details of
the API, the django-developers mailing list is a better forum. Our
contribution process is also documented; if you want to get involved in
contributing to the internals of Django, it's worth giving this document a
read [1].

[1] https://docs.djangoproject.com/en/1.5/internals/contributing/

Yours,
Russ Magee %-)

On Wed, Oct 9, 2013 at 6:19 PM, Arnaud Delobelle  wrote:

> Hi there,
>
> I quite often find that when using queryset.values() I would like to be
> able to define myself the values of the keys, especially when they span
> models:
>
> e.g.
>
>my_query_set.values('foo__bar__baz', 'quux',
> 'another__long__field__name')
>
> Then I end up with dictionaries with unnecessarily long keys.  What I'd
> like to be able to do is something like:
>
> my_query_set.values('quux', baz='foo__bar__baz',
> name='another__long__field__name')
>
> Executing this would yield dictionaries of the type:
>
> {'quux': 2, 'baz': 'type 2', 'name': 'Frobulon'}
>
>
> I've had a quick look at the ValuesQuerySet class and there seems to be a
> simple enough way to get this feature.  I'm presenting it in the form of a
> new ValuesQuerySet subclass and a monkey patch to the parent QuerySet.
>  It's not unlikely that it will break some things as this is my first peek
> into the QuerySet class.  I'd like to know if this is something that other
> people feel the need for and if it is worth pushing for inclusion of such a
> feature into django.
>
> Cheers,
>
> Arnaud
>
> 
>
> from django.db.models.query import QuerySet, ValuesQuerySet
>
>
> class ValuesDictQuerySet(ValuesQuerySet):
>
> def iterator(self):
> # Purge any extra columns that haven't been explicitly asked for
> extra_names = list(self.query.extra_select)
> field_map = self.field_map
> field_names = [field_map.get(fname, fname) for fname in
> self.field_names]
> aggregate_names = list(self.query.aggregate_select)
>
> names = extra_names + field_names + aggregate_names
>
> for row in self.query.get_compiler(self.db).results_iter():
> yield dict(zip(names, row))
>
> def _clone(self, klass=None, setup=False, **kwargs):
> c = super(ValuesDictQuerySet, self)._clone(klass, **kwargs)
> c.field_map = self.field_map
> return c
>
>
> def QuerySet_values_dict(self, *field_list, **field_dict):
> fields = list(field_list)
> fields.extend(field_dict.values())
> field_map = dict(zip(field_dict.values(), field_dict.keys()))
> return self._clone(klass=ValuesDictQuerySet, setup=True,
> _fields=fields, field_map=field_map)
>
>
> # Now we monkey-patch QuerySet with the new method
> QuerySet.values_dict = QuerySet_values_dict
>
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Re: Implementation of a Search Engine. How??

2013-10-09 Thread Kelvin Wong

Look up Solr because it does everything you want. You can crawl with Nutch. 
Django can be used as a front end to that.

http://en.wikipedia.org/wiki/Apache_Solr

K


On Wednesday, October 9, 2013 11:57:25 AM UTC-7, Mithil Bhoras wrote:
>
> Hello, I am a newbie in Django. I am required to do a project in Python 
> and I've chosen Django as the Web Framework. My project is a 'Smart' Search 
> Engine that retrieves results most relevant to user's query. This website 
> will:
>
>1. Index all the web pages available
>2. Use Page Ranking algorithm to update the database as the user uses 
>it
>3. Give suggestions for more appropriate queries based on the most 
>recent queries that other users world wide entered.
>4. Correct queries if user makes a spelling mistake.
>
>

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Re: Retrieving json stored in TextField as json

2013-10-09 Thread Rafael Durán Castañeda

I'm using django-json-field [1] for solving the same problem.

[1] https://github.com/derek-schaefer/django-json-field

HTH
El 09/10/2013, a las 16:01, Marc Aymerich  escribió:

> Hi,
> I'm storing large volumes of json data in a TextFields, Then I have a
> view that converts this text data into JSON, but this silly operation
> requires a considerable amount of resources for a large dataset.
> 
> It would be nice if I'm able to retrieve native JSON directly from the 
> database.
> 
> As you can see value is "almost" json, the only problem is that is
> wrapped around quotes :)
> 
 TimeSerie.objects.filter(type='cpu').values('value')
> [{'value': '{"scheduled":2,"total":864,"15min":0.38,"1min":0.3,"5min":0.48}'},
> {'value': '{"scheduled":2,"total":859,"15min":0.34,"1min":0.23,"5min":0.32}'},
> {'value': '{"scheduled":2,"total":849,"15min":0.33,"1min":0.51,"5min":0.32}'},
> {'value': '{"scheduled":2,"total":814,"15min":0.3,"1min":0.2,"5min":0.25}'},
> {'value': '{"scheduled":2,"total":817,"15min":0.25,"1min":0.14,"5min":0.17}'},
> {'value': '{"scheduled":2,"total":815,"15min":0.22,"1min":0.18,"5min":0.14}'}]
> 
> Any suggestion in how I can speed this up by avoiding to convert each
> element to json by iterating on the query results?
> 
> I'm using psotgresql 9.3 with native json support, not sure if it is
> relevant or not :)
> 
> -- 
> Marc
> 
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Re: Implementation of a Search Engine. How??

2013-10-09 Thread Patrick Müssig

Hi,

maybe is http://yacy.net/ what are you looking for. You can use Yacy as
Searchengine and fetch over the yacy API the data. Yacy has also a good
crawler to crawling webpages and indexing this pages.

greetz
Patrick Müssig


2013/10/9 Mithil Bhoras 

> Hello, I am a newbie in Django. I am required to do a project in Python
> and I've chosen Django as the Web Framework. My project is a 'Smart' Search
> Engine that retrieves results most relevant to user's query. This website
> will:
>
>1. Index all the web pages available
>2. Use Page Ranking algorithm to update the database as the user uses
>it
>3. Give suggestions for more appropriate queries based on the most
>recent queries that other users world wide entered.
>4. Correct queries if user makes a spelling mistake.
>
> We are a team of four under-graduates in our final year of engineering
> trying to implement this web search engine site. Being new to Django, I've
> no idea how I can achieve this. Of course, I've gone through the Django
> documentations, various tutorials on other web pages and familiarized my
> self with the basics by building simple apps like a Blog. I've a basic
> knowledge of Python and Html so problem there. But I don't know how to go
> ahead from there as I've no idea where to start. Can anyone just tell me or
> at least give me a hint of how I can make this possible? Like how do manage
> the database (I'm using SQLite3), make a form to get input query from the
> user or how do I display the search results? Thanks in advance!
>
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Re: Nested includes and captured parameters

2013-10-09 Thread Jason Mayfield

Nevermind.  Discovered typo in a URLconf regex that was causing the problem.

On Wednesday, October 9, 2013 2:41:45 PM UTC-4, Jason Mayfield wrote:
>
> The docs state that "An included URLconf receives any captured parameters 
> from parent URLconfs".  And that does work as expected, when the child 
> URLconf makes immediate use of the parameter -- that is, the child URLconf 
> is a terminal node and doesn't include any further child URLconfs.
>
> In my particular use-case, I find myself needing to use two levels of 
> URLconf includes, and when I do this, the captured parameter seems to get 
> lost along the way.
>
> Examples:
>
> a)  In this scenario, "my_view" gets app1_pk passed in kwargs (expected 
> behavior).
>
> root urls.py:
> …
> url(r'^app1/(?P\d+)/app2/', include('app2.urls')),
> …
>
> app2.urls.py:
> …
> url(r'^my_view/$', 'app2.views.my_view'),
> …
>
> b)  In this scenario (my use-case), "my_view" does not get app1_pk passed 
> in kwargs (but I do not expect this to be the correct behavior).
>
> root urls.py:
> …
> url(r'^app1/', include('app1.urls')),
> …
>
> app1.urls.py:
> …
> url(r'^(?P\d+)/app2/', include('app2.urls')),
> …
>
> app2.urls.py:
> …
> url(r'^my_view/$', 'app2.views.my_view'),
> …
>
> Is this expected behavior?  Any thoughts?
>
> Thanks in advance,
> Jason
>

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Nested includes and captured parameters

2013-10-09 Thread Jason Mayfield

The docs state that "An included URLconf receives any captured parameters 
from parent URLconfs".  And that does work as expected, when the child 
URLconf makes immediate use of the parameter -- that is, the child URLconf 
is a terminal node and doesn't include any further child URLconfs.

In my particular use-case, I find myself needing to use two levels of 
URLconf includes, and when I do this, the captured parameter seems to get 
lost along the way.

Examples:

a)  In this scenario, "my_view" gets app1_pk passed in kwargs (expected 
behavior).

root urls.py:
…
url(r'^app1/(?P\d+)/app2/', include('app2.urls')),
…

app2.urls.py:
…
url(r'^my_view/$', 'app2.views.my_view'),
…

b)  In this scenario (my use-case), "my_view" does not get app1_pk passed 
in kwargs (but I do not expect this to be the correct behavior).

root urls.py:
…
url(r'^app1/', include('app1.urls')),
…

app1.urls.py:
…
url(r'^(?P\d+)/app2/', include('app2.urls')),
…

app2.urls.py:
…
url(r'^my_view/$', 'app2.views.my_view'),
…

Is this expected behavior?  Any thoughts?

Thanks in advance,
Jason

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Implementation of a Search Engine. How??

2013-10-09 Thread Mithil Bhoras

Hello, I am a newbie in Django. I am required to do a project in Python and
I've chosen Django as the Web Framework. My project is a 'Smart' Search
Engine that retrieves results most relevant to user's query. This website
will:

1. Index all the web pages available
2. Use Page Ranking algorithm to update the database as the user uses it
3. Give suggestions for more appropriate queries based on the most
recent queries that other users world wide entered.
4. Correct queries if user makes a spelling mistake.

We are a team of four under-graduates in our final year of engineering
trying to implement this web search engine site. Being new to Django, I've
no idea how I can achieve this. Of course, I've gone through the Django
documentations, various tutorials on other web pages and familiarized my
self with the basics by building simple apps like a Blog. I've a basic
knowledge of Python and Html so problem there. But I don't know how to go
ahead from there as I've no idea where to start. Can anyone just tell me or
at least give me a hint of how I can make this possible? Like how do manage
the database (I'm using SQLite3), make a form to get input query from the
user or how do I display the search results? Thanks in advance!

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Re: admin.py: putting "if condition" in ModelAdmin according to username

2013-10-09 Thread Timothy W. Cook

In the ModelAdmin I use a get_form() to test for conditions on the object.
Specifically, if this item has been published then make it read_only.  You
should be able to test for users as well.

I had to add the try/except in order to add new objects because
obj.published doesn't exist on a new object.

See:
https://docs.djangoproject.com/en/1.5/ref/contrib/admin/#django.contrib.admin.ModelAdmin.get_form


Here is a snippet:
def get_form(self, request, obj=None, **kwargs):
try:
if obj.published:
self.readonly_fields =
['prj_name','published','schema_code','data_name','description','sem_attr','resource_uri','asserts',

'simple_units','coded_units','normal_status','reference_ranges','min_inclusive','max_inclusive',

'min_exclusive','max_exclusive','total_digits','fraction_digits','magnitude','error','accuracy','magnitude_status',]
except (AttributeError, TypeError) as e:
self.readonly_fields = ['published','schema_code']
return super(DvQuantityAdmin, self).get_form(request, obj, **kwargs)



On Wed, Oct 9, 2013 at 11:06 AM, Victor  wrote:

> Yes, I know but unfortunately if in Admin Site you say that a user cannot
> Add, Delete, and Modify a model if that user is connected he/she doesn't
> see the model itself in the list but only those models for which it has
> some kind of permission. I instead would like to make the model visible but
> not editable for that user.
>
> Ciao
> Vittorio
>
> Il giorno 09/ott/2013, alle ore 14:14, Rafael E. Ferrero ha scritto:
>
> > In Admin Site, you can manage users permissions for Add, Delete, Modify
> of every model on your site.
> >
> >
> > 2013/10/9 Vittorio 
> > For the sake of simplicity let's suppose I have
> >
> > models.py
> >
> > class Book(models.Model):
> > title = models.CharField(max_length=100)
> > authors = models.ManyToManyField(Author)
> > publisher = models.ForeignKey(Publisher)
> >
> > Under admin I would like that some username (say "vic" and  "lucky") can
> edit every field of the change form while other users ("tom","sue") can
> only visualize the same data without modification.  I think to put some "if
> condition" in admin.py of this kind
> >
> >
> > class BookOption(admin.ModelAdmin):
> >if username  in ["tom", "sue"]:
> > readonly_fields = ['title','authors','publisher']
> > fields=(('title'),('authors', 'publisher'))..
> > .
> >admin.site.register(Book,BookOption)
> >
> >
> > How can I do it?
> >
> > Ciao
> > Vittorio
> >
> > --
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> >
> >
> > --
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> >
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Re: Looking for a way to detect changes in database records with low storage footprint

2013-10-09 Thread Nikolas Stevenson-Molnar

A hash should work fine. Alternatively, you could diff the two records,
using something like difflib: http://docs.python.org/2/library/difflib.html

_Nik

On 10/9/2013 8:05 AM, DJ-Tom wrote:
> Hi,
>
> a customer has requested a function to "compare" reports.
>
> So let's say I create a database report on Monday, then the data is
> constantly changing the whole week and on the following Monday it
> should be possible to get a report that either contains only changed
> and new records or all records plus a column that indicates that
> something has changed.
>
> It is not important to know exactly which field has changed but only
> that something has changed.
>
> I'm already storing a "change_date" for each record, but this is also
> updated if the user just saves the same data again without actually
> changing any content.
>
> Also it is important to be able to not only compare based on
> date/time, but based on a specific reports status.
>
> So I thought about storing a hash value for every record for each
> report so I could compare this later on.
>
> Is there any functionality that makes creating this hash, e.g. by
> serializing each record into a string and creating a hash from this
> information?
>
> Or does someone have any other (better) idea how to implement this?
>
> Thanks
> Thomas
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Re: Table in models.py not being created during syncdb

2013-10-09 Thread Edward Lazarenko

Can you tell what did you exactly do, to make it work?

On Wednesday, March 31, 2010 10:16:11 PM UTC+5, wchildsuk wrote:
>
> Hi,
>
> I'm using the django app, django-schedule (http://github.com/thauber/
> django-schedule) and am adding an additional table to map users to
> calendars (see line 253 on dpaste).  When I run syncdb it completely
> ignores my table and doesn't through any errors. Can anyone shed any
> light on way it might be being igored?
>
> My models file is available here:
>
> http://dpaste.com/178158/
>
> Thanks in advance
>
> Wes
>
>

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Looking for a way to detect changes in database records with low storage footprint

2013-10-09 Thread DJ-Tom

Hi,

a customer has requested a function to "compare" reports.

So let's say I create a database report on Monday, then the data is
constantly changing the whole week and on the following Monday it should be
possible to get a report that either contains only changed and new records
or all records plus a column that indicates that something has changed.

It is not important to know exactly which field has changed but only that
something has changed.

I'm already storing a "change_date" for each record, but this is also
updated if the user just saves the same data again without actually
changing any content.

Also it is important to be able to not only compare based on date/time, but
based on a specific reports status.

So I thought about storing a hash value for every record for each report so
I could compare this later on.

Is there any functionality that makes creating this hash, e.g. by
serializing each record into a string and creating a hash from this
information?

Or does someone have any other (better) idea how to implement this?

Thanks
Thomas

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Re: Ho can I reverse urls inside urls.py?

2013-10-09 Thread DJ-Tom

Hi Tom,

works like a charm - THX!

Cheers 
Thomas

Am Dienstag, 8. Oktober 2013 17:49:18 UTC+2 schrieb Tom Evans:
>
>
> Use reverse_lazy 
>
> https://docs.djangoproject.com/en/1.5/ref/urlresolvers/#reverse-lazy 
>
>
> Cheers 
>
> Tom 
>

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Re: admin.py: putting "if condition" in ModelAdmin according to username

2013-10-09 Thread Bill Freeman

It's easy, if you don't insist on making it part of the admin, to do this
with a custom view.  It can pay attention to whatever permissions you like.


On Wed, Oct 9, 2013 at 10:06 AM, Victor  wrote:

> Yes, I know but unfortunately if in Admin Site you say that a user cannot
> Add, Delete, and Modify a model if that user is connected he/she doesn't
> see the model itself in the list but only those models for which it has
> some kind of permission. I instead would like to make the model visible but
> not editable for that user.
>
> Ciao
> Vittorio
>
> Il giorno 09/ott/2013, alle ore 14:14, Rafael E. Ferrero ha scritto:
>
> > In Admin Site, you can manage users permissions for Add, Delete, Modify
> of every model on your site.
> >
> >
> > 2013/10/9 Vittorio 
> > For the sake of simplicity let's suppose I have
> >
> > models.py
> >
> > class Book(models.Model):
> > title = models.CharField(max_length=100)
> > authors = models.ManyToManyField(Author)
> > publisher = models.ForeignKey(Publisher)
> >
> > Under admin I would like that some username (say "vic" and  "lucky") can
> edit every field of the change form while other users ("tom","sue") can
> only visualize the same data without modification.  I think to put some "if
> condition" in admin.py of this kind
> >
> >
> > class BookOption(admin.ModelAdmin):
> >if username  in ["tom", "sue"]:
> > readonly_fields = ['title','authors','publisher']
> > fields=(('title'),('authors', 'publisher'))..
> > .
> >admin.site.register(Book,BookOption)
> >
> >
> > How can I do it?
> >
> > Ciao
> > Vittorio
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "Django users" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to django-users+unsubscr...@googlegroups.com.
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> > To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/F0A087D2-8E11-4B0B-8D95-6FC131854994%40de-martino.it
> .
> > For more options, visit https://groups.google.com/groups/opt_out.
> >
> >
> >
> > --
> > Rafael E. Ferrero
> >
> > --
> > You received this message because you are subscribed to the Google
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> > To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/CAJJc_8U3EbZXHVSucFndA25V%3DuYyen%3DGgUsyHmzLncD5DuGi2w%40mail.gmail.com
> .
> > For more options, visit https://groups.google.com/groups/opt_out.
>
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Re: ModelMultipleChoiceField ignore invalid choices?

2013-10-09 Thread David Cox

This could be handled in the form clean() and/or save() methods using a 
try/catch block and passing on thrown exceptions.  You'd have to figure out 
what would be an acceptable way to handle a form submission with an invalid 
selection, though.

On Monday, October 7, 2013 11:15:43 AM UTC-5, Jon Dufresne wrote:
>
> Hi, 
>
> I am using a ModelForm with a ModelMultipleChoiceField. I would like 
> for this field to silently ignore invalid choices instead of creating 
> a form error. Here is my use case: 
>
> * User A opens form select model choice 1, 2, and 3 
> * User B (different browser) deletes model choice 3 entirely from system 
> * User A submits form and receives error 
>
> I understand why this should be an error in the general case, but in 
> my case, I want this to silently ignore the invalid choice 3 and 
> continue with choice 1 and 2? Is this possible? 
>
> Thanks, 
> Jon 
>

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Re: admin.py: putting "if condition" in ModelAdmin according to username

2013-10-09 Thread Victor

Yes, I know but unfortunately if in Admin Site you say that a user cannot Add, 
Delete, and Modify a model if that user is connected he/she doesn't see the 
model itself in the list but only those models for which it has some kind of 
permission. I instead would like to make the model visible but not editable for 
that user.

Ciao
Vittorio 

Il giorno 09/ott/2013, alle ore 14:14, Rafael E. Ferrero ha scritto:

> In Admin Site, you can manage users permissions for Add, Delete, Modify of 
> every model on your site.
> 
> 
> 2013/10/9 Vittorio 
> For the sake of simplicity let's suppose I have
> 
> models.py
> 
> class Book(models.Model):
> title = models.CharField(max_length=100)
> authors = models.ManyToManyField(Author)
> publisher = models.ForeignKey(Publisher)
> 
> Under admin I would like that some username (say "vic" and  "lucky") can edit 
> every field of the change form while other users ("tom","sue") can only 
> visualize the same data without modification.  I think to put some "if 
> condition" in admin.py of this kind
> 
> 
> class BookOption(admin.ModelAdmin):
>if username  in ["tom", "sue"]:
> readonly_fields = ['title','authors','publisher']
> fields=(('title'),('authors', 'publisher'))..
> .
>admin.site.register(Book,BookOption)
> 
> 
> How can I do it?
> 
> Ciao
> Vittorio
> 
> --
> You received this message because you are subscribed to the Google Groups 
> "Django users" group.
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> email to django-users+unsubscr...@googlegroups.com.
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> For more options, visit https://groups.google.com/groups/opt_out.
> 
> 
> 
> -- 
> Rafael E. Ferrero
> 
> -- 
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Retrieving json stored in TextField as json

2013-10-09 Thread Marc Aymerich

Hi,
I'm storing large volumes of json data in a TextFields, Then I have a
view that converts this text data into JSON, but this silly operation
requires a considerable amount of resources for a large dataset.

It would be nice if I'm able to retrieve native JSON directly from the database.

As you can see value is "almost" json, the only problem is that is
wrapped around quotes :)

>>> TimeSerie.objects.filter(type='cpu').values('value')
[{'value': '{"scheduled":2,"total":864,"15min":0.38,"1min":0.3,"5min":0.48}'},
{'value': '{"scheduled":2,"total":859,"15min":0.34,"1min":0.23,"5min":0.32}'},
{'value': '{"scheduled":2,"total":849,"15min":0.33,"1min":0.51,"5min":0.32}'},
{'value': '{"scheduled":2,"total":814,"15min":0.3,"1min":0.2,"5min":0.25}'},
{'value': '{"scheduled":2,"total":817,"15min":0.25,"1min":0.14,"5min":0.17}'},
{'value': '{"scheduled":2,"total":815,"15min":0.22,"1min":0.18,"5min":0.14}'}]

Any suggestion in how I can speed this up by avoiding to convert each
element to json by iterating on the query results?

I'm using psotgresql 9.3 with native json support, not sure if it is
relevant or not :)

-- 
Marc

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Re: django model(s) silently fails to sync to the DB ( for no apparent reason )

2013-10-09 Thread David Cox

I just rtfc, and it might have been a copy-paste mistake, but the 
'str_value' field in your 'DirEnumVal' class has unmatched quotation marks 
for the default attribute.

On Monday, October 7, 2013 8:40:33 PM UTC-5, Doug S wrote:
>
> I don't think I'm making a rookie mistake, I've looked over my code 
> several times.
> I've got two pretty simple django models that are just failing to sync to 
> the db
> during the syncdb there are no errors, even with --verbosity 3
> When I try to make a relation to them I get an error saying the models 
> either don't exist or a re abstract
> In fact when I examine the DB, they are not there.
> syncdb is attempting to sync models before and after these 2 models in the 
> same file.
> I've dropped my DB and started from scratch several times
> I don't know how to debug this issue because I don't know how syncdb works 
> under the covers and what can go wrong.
> Here are my models, they look pretty simple to me:
>
> class DirEnumVal(models.Model):
>
> str_val = models.CharField(max_length=64, default='')
>
> def unicode(self):
>
> return self.str_val
>
> class DirAttr(models.Model):
>
> 
>
> BOOL = 'BOOL'
>
> MONO = 'MONO'
>
> SCAL = 'SCAL'
>
> ENUM = 'ENUM'
>
> 
>
> TYPES = (
>
> (BOOL,'Boolean'),
>
> (MONO,'Monomial'),
>
> (SCAL,'Scalar'),
>
> (ENUM,'Enumeration'),
>
> )
>
> 
>
> val_type = models.CharField(max_length=4, choices=TYPES)
>
> val_key = models.CharField(max_length=32)
>
> default_bool = models.BooleanField(default=True)
>
> default_num = models.IntegerField(default = 0)
>
> default_float = models.FloatField(default=1.0)
>
> enum_choices = models.ManyToManyField(DirEnumVal, null=True, blank=
> True)
>
> default_choice = models.CharField(max_length=64, default='')
>
> required = models.BooleanField(default=True)
>
> 
>
> def unicode(self):
>
> return '{k} :=> {t} ( default = {d} )'.format(
>
> k=self.val_key, t=self.val_type, d=self.default())
>
> I am using a pattern with multiple model files for a single app
>
> my dir structure is:
>
> >app
>
>  > models
>
> - __init__.py 
>
> - model_file1.py
>
> - model_file2.py
>
> and in my __init__.py I've got code to pull all the models together into 
> one module:  app.models
>
>   from __future__ import absolute_import
>
>   from .model_file1 import model1a,model1b,model1c
>
>   from .model_file2 import model2a,model2b,model2c
>
> This way of importing the models has been working long before this trouble 
> of models not being synched came up.
>
> When I access the django project and settings through a python shell I can 
> import the models and instatiate them
>
> but when I save them, PostGres gives me this error:
>
> DatabaseError: current transaction is aborted, commands ignored until end of 
> transaction block
>
>
> This problem surfaced after I installed django-categories and set up some 
> category models.
>
> I had some trouble at first setting that up but I've got the BaseCategory 
> subclasses behaving nicely now
>
> and have started with a fresh DB.
>
> At some point when I was getting django categories to work there was an error 
> when I synched the DB
>
> that said something about an unexcepted special character being somewhere in 
> my code or the django-categories code.
>
> That seemed suspicious but that doesn't show up anymore and I'm using a fresh 
> DB.
>
>
> Does anybody see anything obvious or know what type of problems can cause 
> syncdb to ignore models?
>
> I'm running out of ideas about what is wrong
>
> I'm on Django 1.5 using PostGreSQL & MacOS Lion
>
> Best Doug
>

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Re: django model(s) silently fails to sync to the DB ( for no apparent reason )

2013-10-09 Thread David Cox

There's a chance that running 'manage.py sqlall' might show errors that 
syncdb can't display before failing.  'manage.py sqlall' validates the SQL 
without trying to commit it, so to save time in the future, you should 
really run it before syncdb every time.

If not, and the app is installed, check import statements, then model field 
constraints, like trying to assign numbers to 'null' fields or violating 
'unique' constraints.

Since the db sync is failing on transaction commit, it sounds more like the 
latter than the former, though.  Good luck.

On Monday, October 7, 2013 8:40:33 PM UTC-5, Doug S wrote:
>
> I don't think I'm making a rookie mistake, I've looked over my code 
> several times.
> I've got two pretty simple django models that are just failing to sync to 
> the db
> during the syncdb there are no errors, even with --verbosity 3
> When I try to make a relation to them I get an error saying the models 
> either don't exist or a re abstract
> In fact when I examine the DB, they are not there.
> syncdb is attempting to sync models before and after these 2 models in the 
> same file.
> I've dropped my DB and started from scratch several times
> I don't know how to debug this issue because I don't know how syncdb works 
> under the covers and what can go wrong.
> Here are my models, they look pretty simple to me:
>
> class DirEnumVal(models.Model):
>
> str_val = models.CharField(max_length=64, default='')
>
> def unicode(self):
>
> return self.str_val
>
> class DirAttr(models.Model):
>
> 
>
> BOOL = 'BOOL'
>
> MONO = 'MONO'
>
> SCAL = 'SCAL'
>
> ENUM = 'ENUM'
>
> 
>
> TYPES = (
>
> (BOOL,'Boolean'),
>
> (MONO,'Monomial'),
>
> (SCAL,'Scalar'),
>
> (ENUM,'Enumeration'),
>
> )
>
> 
>
> val_type = models.CharField(max_length=4, choices=TYPES)
>
> val_key = models.CharField(max_length=32)
>
> default_bool = models.BooleanField(default=True)
>
> default_num = models.IntegerField(default = 0)
>
> default_float = models.FloatField(default=1.0)
>
> enum_choices = models.ManyToManyField(DirEnumVal, null=True, blank=
> True)
>
> default_choice = models.CharField(max_length=64, default='')
>
> required = models.BooleanField(default=True)
>
> 
>
> def unicode(self):
>
> return '{k} :=> {t} ( default = {d} )'.format(
>
> k=self.val_key, t=self.val_type, d=self.default())
>
> I am using a pattern with multiple model files for a single app
>
> my dir structure is:
>
> >app
>
>  > models
>
> - __init__.py 
>
> - model_file1.py
>
> - model_file2.py
>
> and in my __init__.py I've got code to pull all the models together into 
> one module:  app.models
>
>   from __future__ import absolute_import
>
>   from .model_file1 import model1a,model1b,model1c
>
>   from .model_file2 import model2a,model2b,model2c
>
> This way of importing the models has been working long before this trouble 
> of models not being synched came up.
>
> When I access the django project and settings through a python shell I can 
> import the models and instatiate them
>
> but when I save them, PostGres gives me this error:
>
> DatabaseError: current transaction is aborted, commands ignored until end of 
> transaction block
>
>
> This problem surfaced after I installed django-categories and set up some 
> category models.
>
> I had some trouble at first setting that up but I've got the BaseCategory 
> subclasses behaving nicely now
>
> and have started with a fresh DB.
>
> At some point when I was getting django categories to work there was an error 
> when I synched the DB
>
> that said something about an unexcepted special character being somewhere in 
> my code or the django-categories code.
>
> That seemed suspicious but that doesn't show up anymore and I'm using a fresh 
> DB.
>
>
> Does anybody see anything obvious or know what type of problems can cause 
> syncdb to ignore models?
>
> I'm running out of ideas about what is wrong
>
> I'm on Django 1.5 using PostGreSQL & MacOS Lion
>
> Best Doug
>

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Re: admin.py: putting "if condition" in ModelAdmin according to username

2013-10-09 Thread Rafael E. Ferrero

In Admin Site, you can manage users permissions for Add, Delete, Modify of
every model on your site.


2013/10/9 Vittorio 

> For the sake of simplicity let's suppose I have
>
> models.py
>
> class Book(models.Model):
> title = models.CharField(max_length=100)
> authors = models.ManyToManyField(Author)
> publisher = models.ForeignKey(Publisher)
>
> Under admin I would like that some username (say "vic" and  "lucky") can
> edit every field of the change form while other users ("tom","sue") can
> only visualize the same data without modification.  I think to put some "if
> condition" in admin.py of this kind
>
>
> class BookOption(admin.ModelAdmin):
>if username  in ["tom", "sue"]:
> readonly_fields = ['title','authors','publisher']
> fields=(('title'),('authors', 'publisher'))..
> .
>admin.site.register(Book,BookOption)
>
>
> How can I do it?
>
> Ciao
> Vittorio
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users+unsubscr...@googlegroups.com.
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Re: Recommended dev environment for a Django project deployed to Linode

2013-10-09 Thread Jorge Arevalo

Interesting! I'm downloading it. Many thanks!

On Thursday, September 26, 2013 7:54:55 PM UTC+2, Ezequiel wrote:
>
> On Wednesday, September 25, 2013 3:06:55 PM UTC-3, Jorge Arevalo wrote:
>
>> Fine. I don't think my boss is going to pay for PyCharm license, so I'll 
>> probably go for Eclipse now (I don't really like it too much, but if works, 
>> it's ok for me)
>>
>
> PyCharm, which is my favorite IDE, has now a Free Community Edition: 
> https://twitter.com/pycharm/status/382549991165673472
>
> Best,
> Ezequiel
> http://flickrock.com/mikelpierre
>

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Re: Recommended dev environment for a Django project deployed to Linode

2013-10-09 Thread Jorge Arevalo

Yep. VirtualEnvWrapper looks like a winner. And thanks for the suggestion 
about the requirements.txt

On Thursday, September 26, 2013 1:36:21 PM UTC+2, Dump wrote:
>
> I have the same stack, GeoDjango + PostGIS (and all its dependencies like 
> GDAL, Proj, GEOS, etc). My notebook runs Debian (also I have a Mac Book 
> Pro, but I prefer to work on Linux) and I use Digital Ocean to host my 
> projects, also running Debian boxes. Since Debian keeps an older version of 
> PostGIS, I have created my own .deb package of PostGIS 2.1. 
>
> IMHO VirtualEnv and VirtualEnvWrapper is the best way to keep your 
> environment updated with the same versions. I also keep a requirements.txt 
> file into the project (I use Git and Bitbucket) with the output of pip 
> freeze command.  
>
> best regards,
>
>
> On 25 September 2013 15:01, Jorge Arevalo  > wrote:
>
>> Hello,
>>
>> First of all, many thanks for your response. Sorry for the delay 
>> answering this. I was in a business trip. 
>>
>> So, you basically have 2 environments: your own machine, and the Linode 
>> box. You make the development and testing in your machine, and Linode is 
>> for production purposes. And you connect both environments via dvcs 
>> push/pull. Right?
>>
>> I like it because it's simple and doesn't seem to be specially prone to 
>> errors. I'd just like to add a third scenario here, to end up with:
>>
>> - Development environment: my own machine (Mac OS X) with all the 
>> software stack installed.
>> - Testing environment: my new addition. I would like to put this 
>> environment outside of my machine
>> - Production environment: the Linode box.
>>
>> I can do the communication via push/pull, if there's no other way to 
>> "deploy" software to production with Python/Django (it's simple, I like 
>> it). And maybe I can have 2 urls (testing and production) in the Linode 
>> box. Testing just accessible to developers and testers, and production open 
>> to normal users. Does it make sense?
>>
>> Thanks again
>>
>> On Tuesday, September 17, 2013 3:50:55 PM UTC+2, Vernon D. Cole wrote:
>>>
>>>
>>> I installed a client for my favourite distributed version control system 
>>> on my Linode instance.  I have a private repository on a public IP.  
>>> (github, bitbucket, or launchpad will work, depending on your dvcs of 
>>> choice -- I have used all three, and other times I have used a private dvcs 
>>> host, including my Linode server itself.) I "cloned" a "checkout" of my 
>>> django system to the Linode. When I am happy from testing a new version of 
>>> my application:  I push it to the repository,  log in to my Linode using 
>>> ssh, and do a pull.  Easy and error free.  (My django environment is almost 
>>> exactly like yours with PostGIS, etc.)
>>> --
>>>
>>> On Monday, September 16, 2013 6:33:49 PM UTC+1, Jorge Arevalo wrote:

 Hello,

 I'm going to start a project based on (Geo)Django + PostgreSQL/PostGIS 
 + OpenLayers/LeafLet + Bootstrap/Foundation. The project will be deployed 
 to a Linode box. That box will be created with something like this: 
 https://manager.linode.**com/linodes/deploy/**
 linode393074?StackScriptID=**6482

 My work box is a MacBook with Mac OS X 10.6.8. There will be 2 people 
 working on the web app (me and another guy). I have almost total freedom 
 to 
 choose, so I want to choose wisely. The whole point is that these 
 constraints should be satisfied:

 - I need a reliable way to upload the application to the 
 test/production environments. At least the production environment will be 
 a 
 Linode box. I just don't want to upload files via FTP, or manually copy 
 them with rsync, or any other practice easily subject to errors. How do 
 the 
 professional django developers set up their environment in order to deploy 
 the app?

 - I'm not sure about which IDE/editor choose. I don't want to start an 
 editor war, and I've used several options in the past. My main interest 
 is: 
 I want to focus on develop. If Eclipse/Aptana/Eric/PyCharm/**any IDE 
 can be easily "linked" to my environment, that's my choice. For example, 
 if 
 I can deploy my app to test/production environment with a couple of clicks 
 or commands, thanks to a plugin or script, that's great. Like deploying to 
 Heroku or EC2, but with Linode. Is there any IDE specially friendly with 
 this kind of development environment?

 - The other(s) developer(s) must be up ASAP. They can't spend 
 half a day installing and configuring stuff to start being productive. I 
 guess a VirtualBox machine + Vagrant would be a good choice here. But, 
 would it make more difficult the deployment cycle? And using a virtual 
 machine to just open the IDE and develop sounds like a resource waste to 
 me. Is there

Re: Recommended dev environment for a Django project deployed to Linode

2013-10-09 Thread Jorge Arevalo

Tested. Works great. Thanks a lot!

On Thursday, September 26, 2013 1:13:58 AM UTC+2, Cal Leeming [Simplicity 
Media Ltd] wrote:
>
> +1 for virtualenvwrapper, don't know how I survived without this!!
>
> Cal
>
>
> On Wed, Sep 25, 2013 at 9:59 PM, Roberto López López 
>  > wrote:
>
>>  
>> Check virtualenvwrapper
>>
>> http://virtualenvwrapper.readthedocs.org/en/latest/
>>
>>
>>
>>
>> On 09/25/2013 08:06 PM, Jorge Arevalo wrote:
>>  
>> Fine. I don't think my boss is going to pay for PyCharm license, so I'll 
>> probably go for Eclipse now (I don't really like it too much, but if works, 
>> it's ok for me) 
>>
>>  About virtualenv, is there any method to provide something like a 
>> script to create a virtualenv, install the needed software and have a 
>> working environment in a few commands? Something like "vagrantfile for 
>> virtualenv" http://docs.vagrantup.com/v2/vagrantfile/index.html
>>
>>  Again, many thanks for your useful insights
>>
>> On Tuesday, September 17, 2013 4:29:14 PM UTC+2, Vernon D. Cole wrote: 
>>>
>>>  Answering the other half of your question:  The choice of IDE is not 
>>> nearly as important as its ease of integration with your dvcs.  If you are 
>>> already familiar with a good one, don't change.
>>>
>>> On my present project, my boss and I are both using PyCharm, and my 
>>> other co-worker is using Eclipse, since he is more comfortable (and 
>>> therefore, more productive) with it. Both IDE's have good integration with 
>>> git (my least favourite dvcs, but the boss's choice) and our sharing is 
>>> done using a group private repository on github.  This is on Ubuntu Linux, 
>>> it all works well.   In the evening hours, I use PyCharm on Windows 7 to 
>>> contribute to an open source project hosted on bitbucket using mercurial. 
>>> Both projects end up being tested on the same Linode.
>>>
>>> Yes, use virtualenv.  I also made the mistake of thinking of it as a 
>>> virtual computer.  It is not.  It is only a method of separating Python 
>>> library directories so that you can experiment with different 
>>> configurations easily.  It does not slow anything down, and actually makes 
>>> installation of packages easier.  Use virtualenvwrapper to make switching 
>>> environments easy.  PyCharm also supports virtual environments as well as 
>>> django projects. It is commercial, and suffers from a few Java 
>>> idiosyncrasies, but the boss paid for the license ;-) so I don't mind.
>>>
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>>
>>
>> -- 
>>
>> Roberto López López
>> System Developer
>> Parallab, Uni Computing+47 55584091
>>
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>
>

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Re: Recommended dev environment for a Django project deployed to Linode

2013-10-09 Thread Jorge Arevalo

Thanks both for the suggestions! (and sorry for the delay, I was on a 
business trip). Looks like there's a lot of things to learn. I'll probably 
use a staging machine, like suggested. And now I'm between Eclipse, emacs 
and PyCharm. Time to work!

On Wednesday, September 25, 2013 9:48:26 PM UTC+2, Vernon D. Cole wrote:
>
> Yes, I like to have three levels, too.  I call the middle one "staging".  
> You can tear it down and build it up again as many times as needed to get 
> it right.
>
> A ten-year-old PC will work fine for staging practice. Blow the dust out 
> (the dust affects cooling and leads to poor reliability), load Ubuntu, and 
> park it in an unused corner somewhere.  My home-office Linux box is a Dell 
> desktop purchased at a University surplus sale for $20 six or seven years 
> ago. It runs Apache, MySQL, Asterisk, and the Python program that regulates 
> the lights and heat in our Iguana enclosure. The most expensive component 
> (other than the iguana) is a $50 UPS.  Much easier than trying to make your 
> production machine do double duty.
>
> I use a structured settings module to switch back-and-forth between the 
> three levels.  Look at the manage.py and the formhub/settings directory in 
> https://github.com/vernondcole/formhub for an example how to do that.   
> Also look at requirements.pip in that repository for an idea how to load 
> most of the prerequisites automatically. Documentation is in the wiki of 
> https://github.com/modilabs/formhub/wiki/_pages .  (Formhub is a django 
> system used to receive generic survey data taken using android devices 
> offline.)
>
>
>
>
> On Wed, Sep 25, 2013 at 12:49 PM, Bill Freeman  > wrote:
>
>> I guess that it's what you're used to.  I'm perfectly happy with emacs 
>> (less so with vi or vim, but still happy enough).  I'm happy with emac's 
>> python mode, css mode, etc.  There's even supposed to be help for Django 
>> templates now.  I'm using the Espresso add-on for JavaScript.  It's not 
>> everything that the IDEs offer, but I don't have to keep re-learning how to 
>> do things.  vim has some pretty good syntax support too.  I certainly 
>> wouldn't pay for something.  And having installed eclipse, it makes emacs 
>> look light weight.
>>
>> Indeed, I, too, tend to develop and test on my laptop, when I'm happy, 
>> check in my chaanges (mercurial), push to the linode, ssh in, update to 
>> head, and touch the wsgi script file (IIRC).  In a pinch I can directly 
>> edit on the linode, using vim through ssh, or emacs tramp mode over ssh, 
>> or, if you want to install your favorite X based editor on the linode, 
>> through a ssh -Y tunnel.
>>
>> Bill, the curmudgeon
>>
>>
>> On Wed, Sep 25, 2013 at 2:06 PM, Jorge Arevalo 
>> > > wrote:
>>
>>> Fine. I don't think my boss is going to pay for PyCharm license, so I'll 
>>> probably go for Eclipse now (I don't really like it too much, but if works, 
>>> it's ok for me)
>>>
>>> About virtualenv, is there any method to provide something like a script 
>>> to create a virtualenv, install the needed software and have a working 
>>> environment in a few commands? Something like "vagrantfile for virtualenv" 
>>> http://docs.vagrantup.com/v2/vagrantfile/index.html
>>>
>>> Again, many thanks for your useful insights
>>>
>>>
>>> On Tuesday, September 17, 2013 4:29:14 PM UTC+2, Vernon D. Cole wrote:

 Answering the other half of your question:  The choice of IDE is not 
 nearly as important as its ease of integration with your dvcs.  If you are 
 already familiar with a good one, don't change.

 On my present project, my boss and I are both using PyCharm, and my 
 other co-worker is using Eclipse, since he is more comfortable (and 
 therefore, more productive) with it. Both IDE's have good integration with 
 git (my least favourite dvcs, but the boss's choice) and our sharing is 
 done using a group private repository on github.  This is on Ubuntu Linux, 
 it all works well.   In the evening hours, I use PyCharm on Windows 7 to 
 contribute to an open source project hosted on bitbucket using mercurial. 
 Both projects end up being tested on the same Linode.

 Yes, use virtualenv.  I also made the mistake of thinking of it as a 
 virtual computer.  It is not.  It is only a method of separating Python 
 library directories so that you can experiment with different 
 configurations easily.  It does not slow anything down, and actually makes 
 installation of packages easier.  Use virtualenvwrapper to make switching 
 environments easy.  PyCharm also supports virtual environments as well as 
 django projects. It is commercial, and suffers from a few Java 
 idiosyncrasies, but the boss paid for the license ;-) so I don't mind.

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>>> Groups "Django users" group.
>>> To unsubscribe from this group

admin.py: putting "if condition" in ModelAdmin according to username

2013-10-09 Thread Vittorio

For the sake of simplicity let's suppose I have

models.py

class Book(models.Model):
title = models.CharField(max_length=100)
authors = models.ManyToManyField(Author)
publisher = models.ForeignKey(Publisher)

Under admin I would like that some username (say "vic" and  "lucky") can edit 
every field of the change form while other users ("tom","sue") can only 
visualize the same data without modification.  I think to put some "if 
condition" in admin.py of this kind


class BookOption(admin.ModelAdmin):
   if username  in ["tom", "sue"]:
readonly_fields = ['title','authors','publisher']
fields=(('title'),('authors', 'publisher'))..
.
   admin.site.register(Book,BookOption)


How can I do it?

Ciao
Vittorio

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