Re: Naive redirection programming question
I don't know if this is the best solution, but I made a
context_preocessor which add content from session variable to every
template i load. I then put in my layout a variable to show it. Finally,
every time I want to show some message i add it to a given variable in
session. Code for context processor looks like this:
def
flash(request):
#return {'flash': {'notice':
'works'}}
notice = request.session.get('flash_notice',
False)
request.session['flash_notice']=False
warning = request.session.get('flash_warning',
False)
request.session['flash_warning']=False
error = request.session.get('flash_error',
False)
request.session['flash_error']=False
#sprawdza czy sa w ogole jakiekolwiek
flashe
if notice or warning or
error:
messages =
True
else:
messages =
False
return {'flash': {'notice': notice, 'warning': warning, 'error':
error, 'messages':
messages}}
it checks for three types of messages: notice, warning and error. It
also add additional variable 'messages' to indicate if there is any
message to show at all. So, the only thing you need to do is add a
message to given session variable and reload/redirect a page. You can
read up on context processors and how to use them in django documentation.
Rodney Topor pisze:
> Suppose you've just processed posted form data and successfully added
> a new item to the database. Now you return HttpResponseRedirect('/
> items/') (I know, you should use a pattern name not an absolute URL
> here) to display the list of items, including the newly added item.
>
> But, suppose you want to prefix the list of items with a message,
> e.g., "Congratulations, your item was successfully added.". If you
> were returning render_to_response('item_list.html"), you could pass in
> a dictionary {"message": message}, and the template could display the
> variable message if it is not empty.
>
> How can you do something similar when using HttpResponseRedirect()?
>
> Or am I thinking about this problem the wrong way?
>
> Thanks.
> >
>
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Re: Standalone script with django's ORM and multiprocessing
prabhu S pisze: > Solution appears like a hack to me. Why do you close the connection in > every process? Can you not just close once in parent? Execute commits > alone in each process. > I've checked that. Unfortunately, in my case, it won't work. I have a loop looking like this: for job in joblist: p = Process(target=self.run_job) p.start() When i close connection before this loop i get errors like at the beggining. When i close connection just before creating a new process i get: 'lost connection while performing a query' (or something like that :)). Finally when i close connection just right after this loop it starts to behave weirdly. One time it works fine, but next time i launch it i get mysql has gone away errors. I suppose this happens because sometimes subprocesses fire up queries after parent finishes this loop, but sometimes they're faster and still use parent's connection. Closing connections in subprocesses might look a bit hacky. I could try to somehow reinitialize db connection, but simply closing it, and leaving the rest to django is a lot easier :) Thank you for your replies. I appreciate it. Regards Spajderix --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: Standalone script with django's ORM and multiprocessing
Malcolm Tredinnick pisze: > On Tue, 2009-08-11 at 11:06 +0200, Spajderix wrote: > >> Hi! >> >> I've written a standalone script, which looks throught a table in db for >> tasks to perform. It then starts subprocesses for each task it founds >> using multiprocessing.Process class from python. Everything's fine when >> there is one task, but when i try to start more subprocesses at once i get: >> >> OperationalError: (2013, 'Lost connection to MySQL server during query') >> raise errorclass, errorvalue >> OperationalError: (2006, 'MySQL server has gone away') >> >> I guess that this happens because all subprocesses share one connection, >> and when one of them closes this connection, rest of subprocesses raises >> an error. >> > > That certainly sounds believable. We call close() explicitly, too, so > that is why ongoing operations are interrupted in the middle. > > >> Do you know a way to go round this problem? >> > > If you close the database connection, Django will open a new one the > next time it needs it. So I suspect you can work around this by > explicitly closing the connection immediately after you start a new > process (in the new process). Then the process will get its own > connection when you try to do something. > > Regards, > Malcolm > > Thank you! That solved the problem:) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Standalone script with django's ORM and multiprocessing
Hi! I've written a standalone script, which looks throught a table in db for tasks to perform. It then starts subprocesses for each task it founds using multiprocessing.Process class from python. Everything's fine when there is one task, but when i try to start more subprocesses at once i get: OperationalError: (2013, 'Lost connection to MySQL server during query') raise errorclass, errorvalue OperationalError: (2006, 'MySQL server has gone away') I guess that this happens because all subprocesses share one connection, and when one of them closes this connection, rest of subprocesses raises an error. Do you know a way to go round this problem? Regards Spajderix --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: HttpResponseRedirect with POST
Hi,
wouldn't it be easier to put this data to session?
Sławek Tuleja pisze:
> HI everyone!
>
> Can I redirect to view with form passing few variables in POST method
> (request.POST) and showing them in the form? (i need this in admin
> action)
>
> for example this works:
> def add_mailing(self, request, queryset):
> return HttpResponseRedirect('%s?subject=halo' % \
> urlresolvers.reverse
> ('admin:tenders_mailing_add'))
>
> but this does not:
> def add_mailing(self, request, queryset):
> post = request.POST.copy()
> post.update({'subject': 'halo'})
> request.POST = post
> return HttpResponseRedirect(urlresolvers.reverse
> ('admin:tenders_mailing_add'))
>
> * subject is name of text field in a form
> >
>
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Re: Calculating a date
From what i know, you can operate on datetime.datetime objects using datetime.timedelta, eg: datetime.datetime.now() - datetime.timedelta(days=84) will give you datetime.datetime object with date of today - 12 weeks Link to manual: http://docs.python.org/library/datetime.html#datetime.timedelta adelaide_mike pisze: > This should really be a Python enquiry, but I am sure someone will > know: > > I need to calculate the date 12 weeks before today. What is the best > way? TIA > > Mike > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: buildung query with ORM
tom pisze:
> Hi group,
>
> i build a model to save measurement data. a measurement entry has
> always a channel (that is the source where the data comes from), a
> value (for example 1.04), a unit (for example m/s or Hz) and a
> timestamp.
> The timestamp and the channel are together unique. every channel can
> only have one data entry for one timestamp.
>
> i have the following model:
>
> class Data(models.Model):
> datetime = models.DateTimeField(help_text='the date and time of
> the measurement value', db_index=True)
> channel = models.CharField(help_text='the channelname',
> max_length=20, db_index=True)
> value = models.FloatField(help_text='the measurement value',
> db_index=True)
> unit = models.CharField(help_text='the unit of the measurement
> value', max_length=20, db_index=True)
> class Meta:
> unique_together = [('datetime', 'channel')]
>
> now, i want to have a query to get the following data-table:
>
> datetimechannel1 unit1channel2
> unit2
> 2009-01-01 00:00:00 10.0m/s 1000 Hz
> 2009-01-01 00:00:10 15.0m/s 1040 Hz
> 2009-01-01 00:00:20 16.0m/s 1563 Hz
>
>
> Is something like this possible with django?
> i know that i can get all data ordered by date and the use python to
> get a datastructure like the described table. but i want to do it with
> the database because i think it's much faster.
>
> any ideas how to do this?
>
>
> Best regards,
>
> tom
>
> >
>
I would recommend a bit different solution. Instead of one, use two
tables like this:
class Entry(models.Model):
datetime = models.DateTimeField(help_text='the date and time of the
measurement value', db_index=True)
class Data(models.Model):
entry = ForeignKey(Entry)
channel = models.CharField(help_text='the channelname', max_length=20,
db_index=True)
value = models.FloatField(help_text='the measurement value', db_index=True)
unit = models.CharField(help_text='the unit of the measurement value',
max_length=20, db_index=True)
Then you have one entry element with as many data elements as you like. You
access it by taking one element object and going through relation, eg:
e = Entry(pk=1)
e.data_set.all()
I don't know if "unique_together" will work with this though
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Re: apache
Hi, replace PythonPath "['/home/testpec/public_html/pecwizard/'] + sys.path" with PythonPath "['/home/testpec/public_html/'] + sys.path" and should then work Salvatore Leone pisze: > Hi, > > I'm trying to move my site from the developemente server to Apache but I > always obtain this error: > > ImportError: Could not import settings 'pecwizard.settings' (Is it on > sys.path? Does it have syntax errors?): No module named pecwizard.settings > > > > and here is my apache configuration: > > > > > SetHandler python-program > > PythonHandler django.core.handlers.modpython > > SetEnv DJANGO_SETTINGS_MODULE pecwizard.settings > > PythonPath "['/home/testpec/public_html/pecwizard/'] + sys.path" > > PythonOption django.root /pecwizard > > PythonDebug On > > > > > > any idea of what could be wrong? > > I tryend to put: > > SetEnv DJANGO_SETTINGS_MODULE /home/testpec/public_html/pecwizard/settings.py > > > but it says something about I can't set the variable with a full path to > the settings.py file > > -Salvatore > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: Create a new user profile
Hi,
you have to create new "User" object, assign values to it and then
assign this object to profile_obj. Example:
from django.contrib.auth.models import User
new_user = User()
profile_obj = UserProfile()
new_user.username = 'someusername'
new_user.password = 'somepassword'
new_user.save()
profile_obj.user=new_user
profile_obj.save()
Steven Nien pisze:
> Hi all,
> I have built a model like this:
>
> class UserProfile(models.Model):
> address = models.CharField(max_length=60)
> birthday = models.DateField()
> user = models.ForeignKey(User)
>
> I render the model by the ModelForm:
>
> class UserProfileForm(ModelForm):
> class Meta:
> model = UserProfile
> exclude = ('user', )
>
> I am trying to create a "blank" profile for the current user, if the
> profile does not already exist.
> I have tried the following code but it didn't work.
>
> if request.user.is_authenticated():
> username = request.user.username
> try:
> profile = request.user.get_profile()
> except ObjectDoesNotExist:
> profile_obj=UserProfile(user=username)
> profile_obj.save()
>
> which I got a error message:
> Cannot assign "u'someone": "UserProfile.user" must be a "User"
> instance.
>
> Can someone help me?
> Many thanks.
>
> >
>
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