No worries. Wow, I've got some interesting results. I am pretty sure the
ModelForm class has a bug in it that it is not looking at the secondary
database with the using() method. It is a bug in the foreign reference
fields only, though.
I set up tables in my default database, and in an extra database named
staff, which is set up in settings.py.
In default DB:
n_test_staff
username;nics_group
"tsamuel";1
n_nics_groups
n_group_number;n_group_name
1;"Group1"
2;"Group2"
In staff DB:
n_test_staff
username;nics_group
"tsamuel";2 (Notice tsamuel in group 2 in this DB)
n_nics_groups
n_group_number;n_group_name
1;"Staff1"
2;"Staff2"
In the models, wrote __unicode__(self): method to show the groups.
Here's something strange:
>>> from models import Staff, NICSGroupType
>>> from django.forms import ModelForm
>>> class StaffForm(ModelForm):
... class Meta:
... model = Staff
...
>>> staff = Staff.objects.using('staff').get(username='tsamuel')
>>> print staff
tsamuel <group: Staff2 >
>>> form = StaffForm(instance=staff)
>>> print form
<tr><th><label for="id_username">Username:</label></th><td><input
id="id_username" type="text" name="username" value="tsamuel" maxlength="50"
/></td></tr>
<tr><th><label for="id_nics_group">Nics group:</label></th><td><select
name="nics_group" id="id_nics_group">
<option value="">---------</option>
<option value="2" selected="selected">2: Group2</option>
<option value="1">1: Group1</option>
</select></td></tr>
Notice this ModelForm is getting the Staff data from the 'staff' database,
but is getting the reference n_nics_groups data from the default database's
n_nics_groups table. Remember in staff tsamuel was part of group 2, which
is the selected option, but the label is Group2 instead of Staff2, which is
the value in n_nics_groups table in the 'staff' database.
Then I tried deleting the default database n_test_staff table to verify:
>>> from models import Staff, NICSGroupType
>>> from django.forms import *
>>> class StaffForm(ModelForm):
... class Meta:
... model = Staff
...
>>> staff = Staff.objects.using('staff').get(username='tsamuel')
>>> form = StaffForm(instance=staff)
>>> print form
<tr><th><label for="id_username">Username:</label></th><td><input
id="id_username" type="text" name="username" value="tsamuel" maxlength="50"
/></td></tr>
<tr><th><label for="id_nics_group">Nics group:</label></th><td><select
name="nics_group" id="id_nics_group">
<option value="">---------</option>
<option value="2" selected="selected">2: Group2</option>
<option value="1">1: Group1</option>
</select></td></tr>
Now, if I delete the default database's n_nics_groups table also, so it
should all be using the 'staff' database, the only place n_test_staff and
n_nics_groups exist now.
>>> from models import Staff, NICSGroupType
>>> from django.forms import *
>>> class StaffForm(ModelForm):
... class Meta:
... model = Staff
...
>>> staff = Staff.objects.using('staff').get(username='tsamuel')
>>> print staff
tsamuel <group: Staff2 >
>>> form = StaffForm(instance=staff)
>>> print form
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/lib/python2.5/site-packages/django/utils/encoding.py", line
27, in __str__
return self.__unicode__().encode('utf-8')
File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line 95,
in __unicode__
return self.as_table()
File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line 217,
in as_table
errors_on_separate_row = False)
File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line 180,
in _html_output
'field': unicode(bf),
File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line 408,
in __unicode__
return self.as_widget()
File "/usr/lib/python2.5/site-packages/django/forms/forms.py", line 439,
in as_widget
return widget.render(name, self.value(), attrs=attrs)
File "/usr/lib/python2.5/site-packages/django/forms/widgets.py", line
516, in render
options = self.render_options(choices, [value])
File "/usr/lib/python2.5/site-packages/django/forms/widgets.py", line
533, in render_options
for option_value, option_label in chain(self.choices, choices):
File "/usr/lib/python2.5/site-packages/django/forms/models.py", line 882,
in __iter__
for obj in self.queryset.all():
File "/usr/lib/python2.5/site-packages/django/db/models/query.py", line
107, in _result_iter
self._fill_cache()
File "/usr/lib/python2.5/site-packages/django/db/models/query.py", line
772, in _fill_cache
self._result_cache.append(self._iter.next())
File "/usr/lib/python2.5/site-packages/django/db/models/query.py", line
273, in iterator
for row in compiler.results_iter():
File "/usr/lib/python2.5/site-packages/django/db/models/sql/compiler.py",
line 680, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/lib/python2.5/site-packages/django/db/models/sql/compiler.py",
line 735, in execute_sql
cursor.execute(sql, params)
File
"/usr/lib/python2.5/site-packages/django/db/backends/postgresql_psycopg2/base.py",
line 44, in execute
return self.cursor.execute(query, args)
DatabaseError: relation "n_nics_groups" does not exist
This seems to be a bug in the ModelForm class that is not honoring the
referenced fields that exist outside the default database. I tried
appending the using('staff') to a few different places in the StaffForm
class and also to the instance of StaffForm, but to no avail. Anybody else
see this as not a bug?
Furbee
On Fri, Nov 4, 2011 at 1:45 PM, Tabitha Samuel <tabitha.sam...@gmail.com>wrote:
> I don't mean to be spamming you like this, just thought you might be
> interested in this result:
>
> So I created the same tables (n_test_staff and n_nics_groups) in the
> default gibbs database. I removed the using part in the form statement
> (form = StaffForm(instance = Staff.objects.using('gold').get(username
> =current_staff), so now it looks like form = StaffForm(instance =
> Staff.objects.get(username =current_staff) and it works fine,
> everything is getting displayed in the view perfectly!!
>
> Problem is that those two tables have to live in the other database -
> gold. Not sure how to proceed from here. I may just have to remove the
> foreign key reference for the time being and update it manually in the
> code, until a fix can be found for this.
>
> Tabitha
>
> On Nov 4, 3:19 pm, Tabitha Samuel <tabitha.sam...@gmail.com> wrote:
> > I found this patch for the raw function (https://
> > code.djangoproject.com/attachment/ticket/13805/manager.patch), because
> > according to this ticket (https://code.djangoproject.com/ticket/
> > 13805), .raw does not work in a multi db env. So this is what I have:
> >
> > in django/db/models/manager.py, I have created a new function:
> > def raw(self, raw_query, params=None, using=None, *args, **kwargs):
> > if using is None:
> > using = self._db
> > print using
> > return RawQuerySet(raw_query=raw_query, model=self.model,
> > params=params, using=using, *args, **kwargs)
> >
> > The print using returns "gold" so I know it is using this method.
> >
> > Now, I have
> > form = StaffForm(instance = Staff.objects.raw("SELECT s.*,
> > g.n_group_name FROM n_test_staff s LEFT JOIN n_nics_groups g
> > ON(g.n_group_number = s.nics_group) WHERE s.username =
> > 'tsamuel'",None,"gold"))
> > in my view and I am still getting the error:
> > AttributeError at /staff/staffinfo
> > 'RawQuerySet' object has no attribute '_meta'
> >
> > This is the traceback:
> > Traceback:
> > File "/nics/a/applications/gibbs/python/site-packages_django/django/
> > core/handlers/base.py" in get_response
> > 111. response = callback(request,
> > *callback_args, **callback_kwargs)
> > File "/nics/a/applications/gibbs/python/site-packages_django/django/
> > contrib/auth/decorators.py" in _wrapped_view
> > 23. return view_func(request, *args, **kwargs)
> > File "/nics/a/home/tsamuel/tssandbox/gibbs/utils/decorators.py" in
> > decorate
> > 11. return view_func(request, *args, **kws)
> > File "/nics/a/home/tsamuel/tssandbox/gibbs/../gibbs/staff/views.py" in
> > staff_info
> > 156. form = StaffForm(instance = Staff.objects.raw("SELECT s.*,
> > g.n_group_name FROM n_test_staff s LEFT JOIN n_nics_groups g
> > ON(g.n_group_number = s.nics_group) WHERE s.username =
> > 'tsamuel'",None,"gold"))
> > File "/nics/a/applications/gibbs/python/site-packages_django/django/
> > forms/models.py" in __init__
> > 237. object_data = model_to_dict(instance, opts.fields,
> > opts.exclude)
> > File "/nics/a/applications/gibbs/python/site-packages_django/django/
> > forms/models.py" in model_to_dict
> > 110. opts = instance._meta
> >
> > Exception Type: AttributeError at /staff/staffinfo
> > Exception Value: 'RawQuerySet' object has no attribute '_meta'
> >
> > On Nov 4, 2:49 pm, Tabitha Samuel <tabitha.sam...@gmail.com> wrote:
> >
> >
> >
> >
> >
> >
> >
> > > One thought I have is that the using() is messing things up. Would it
> > > be possible for you to create a second non-default db, throw these two
> > > tables in there and then try the same thing? If that works for you,
> > > then I must have a ghost sitting in my system! :-|
> >
> > > On Nov 4, 2:28 pm, Furbee <furbeena...@gmail.com> wrote:
> >
> > > > That is very strange... I recreated this on my development system
> and it
> > > > worked fine. I looked for Django bugs, but haven't found any related
> to
> > > > this issue. To be clear, the table n_nics_groups definitely exists
> in the
> > > > same database as n_test_staff, right? It does in mine because I used
> python
> > > > manage.py syncdb to create them from the models. If so, maybe we
> should try
> > > > to create a raw() query to see if the system has a bug creating the
> query.
> > > > This should be similar:
> >
> > > > form = StaffForm(instance = Staff.objects.raw("SELECT s.*,
> g.n_group_name
> > > > FROM n_test_staff s LEFT JOIN n_nics_groups g ON(g.n_group_number =
> > > > s.nics_group) WHERE s.username = 'tsamuel'))
> >
> > > > If that throws an error, we may have a problem in the DB layer.
> >
> > > > Thanks,
> >
> > > > Furbee
> >
> > > > On Fri, Nov 4, 2011 at 10:29 AM, Tabitha Samuel <
> tabitha.sam...@gmail.com>wrote:
> >
> > > > > The error that I'm getting is on the second form instantiation,
> that
> > > > > is on the line:
> >
> > > > > form = StaffForm(instance =
> Staff.objects.using('gold').get(username =
> > > > > current_staff)
> > > > > where current_staff='tsamuel' for instance
> >
> > > > > This is the traceback of the error that I get when I do a print
> form
> > > > > right after getting the form:
> > > > > Environment:
> >
> > > > > Request Method: GET
> > > > > Request URL:http://watermelon.nics.utk.edu:8004/staff/staffinfo
> >
> > > > > Django Version: 1.3.1
> > > > > Python Version: 2.6.2
> > > > > Installed Applications:
> > > > > ['django.contrib.auth',
> > > > > 'django.contrib.contenttypes',
> > > > > 'django.contrib.sessions',
> > > > > 'django.contrib.sites',
> > > > > 'gibbs.quartermaster',
> > > > > 'gibbs.userportal',
> > > > > 'gibbs.reports',
> > > > > 'gibbs.events',
> > > > > 'gibbs.job_stats',
> > > > > 'gibbs.simulator',
> > > > > 'gibbs.staff']
> > > > > Installed Middleware:
> > > > > ('django.contrib.csrf.middleware.CsrfViewMiddleware',
> > > > > 'django.middleware.common.CommonMiddleware',
> > > > > 'django.contrib.csrf.middleware.CsrfResponseMiddleware',
> > > > > 'django.contrib.sessions.middleware.SessionMiddleware',
> > > > > 'django.contrib.auth.middleware.AuthenticationMiddleware')
> >
> > > > > Traceback:
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > core/handlers/base.py" in get_response
> > > > > 111. response = callback(request,
> > > > > *callback_args, **callback_kwargs)
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > contrib/auth/decorators.py" in _wrapped_view
> > > > > 23. return view_func(request, *args, **kwargs)
> > > > > File "/nics/a/home/tsamuel/tssandbox/gibbs/utils/decorators.py" in
> > > > > decorate
> > > > > 11. return view_func(request, *args, **kws)
> > > > > File
> "/nics/a/home/tsamuel/tssandbox/gibbs/../gibbs/staff/views.py" in
> > > > > staff_info
> > > > > 159. print form
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > utils/encoding.py" in __str__
> > > > > 27. return self.__unicode__().encode('utf-8')
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/forms.py" in __unicode__
> > > > > 95. return self.as_table()
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/forms.py" in as_table
> > > > > 217. errors_on_separate_row = False)
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/forms.py" in _html_output
> > > > > 180. 'field': unicode(bf),
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/forms.py" in __unicode__
> > > > > 408. return self.as_widget()
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/forms.py" in as_widget
> > > > > 439. return widget.render(name, self.value(), attrs=attrs)
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/widgets.py" in render
> > > > > 516. options = self.render_options(choices, [value])
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/widgets.py" in render_options
> > > > > 533. for option_value, option_label in chain(self.choices,
> > > > > choices):
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/
> > > > > forms/models.py" in __iter__
> > > > > 882. for obj in self.queryset.all():
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > models/query.py" in _result_iter
> > > > > 107. self._fill_cache()
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > models/query.py" in _fill_cache
> > > > > 772.
> > > > > self._result_cache.append(self._iter.next())
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > models/query.py" in iterator
> > > > > 273. for row in compiler.results_iter():
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > models/sql/compiler.py" in results_iter
> > > > > 680. for rows in self.execute_sql(MULTI):
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > models/sql/compiler.py" in execute_sql
> > > > > 735. cursor.execute(sql, params)
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > backends/util.py" in execute
> > > > > 34. return self.cursor.execute(sql, params)
> > > > > File
> "/nics/a/applications/gibbs/python/site-packages_django/django/db/
> > > > > backends/postgresql_psycopg2/base.py" in execute
> > > > > 44. return self.cursor.execute(query, args)
> >
> > > > > Exception Type: DatabaseError at /staff/staffinfo
> > > > > Exception Value: relation "n_nics_groups" does not exist
> >
> > > > > Tabitha
> >
> > > > > On Nov 4, 11:31 am, Furbee <furbeena...@gmail.com> wrote:
> > > > > > Oh no, that would not be a good thing to share! :-) That's a
> bummer that
> > > > > > the upgrade broke things.
> >
> > > > > > So, the error is being raised on this line?
> > > > > > staff_form = StaffForm(request.POST,
> > > > > instance=staffinstance).using('gold')
> >
> > > > > > Furbee
> >
> > > > > > On Fri, Nov 4, 2011 at 8:02 AM, Tabitha Samuel <
> tabitha.sam...@gmail.com
> > > > > >wrote:
> >
> > > > > > > So this is how I'm creating the staff form:
> >
> > > > > > > def staff_info(request, *args, **kws):
> > > > > > > class StaffForm(forms.ModelForm):
> > > > > > > class Meta:
> > > > > > > model= Staff
> > > > > > > ....
> > > > > > > ....
> > > > > > > ....
> > > > > > > if request.method == 'POST' and request.POST['event'] ==
> > > > > > > 'choosestaff':
> > > > > > > current_staff =
> > > > > > > request.POST.get('selectstaff')
> > > > > > > elif request.method == 'POST' and request.POST['event'] ==
> > > > > > > 'editstaff':
> > > > > > > #print
> > > > > > > request
> > > > > > > current_staff =
> > > > > > > request.POST.get('username')
> > > > > > > errors =
> > > > > > > validate_staff(request)
> > > > > > > if errors is not None and len(errors) ==
> > > > > > > 0:
> > > > > > > print...
> >
> > read more ยป
>
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