IntegrityError with proxy model but not with parent?

[Derek]

I am working with a proxy model that does not seem to work with the 'unique_together' of the model being proxied.

What I have is:

class Parent(Model):
    id = AutoField(primary_key=True)
    name = CharField()
    stuff = CharField()

    class Meta:
        ordering = ['name']
        unique_together = (('name', 'stuff'),)

class Myproxy(Parent):

    class Meta:
        proxy = True

    def __init__(self, *args, **kwargs):
        super(Myproxy, self).__init__(*args, **kwargs)
        self.stuff = "test"

If I use the Parent model and try to enter, 'myname' and 'test' as the name/stuff entries twice, I get the usual warning on the second attempt; the admin telling me that this model entry already exists.
       
However, if I try the same thing on the Myproxy model (which has a form without the stuff field; as its meant to be a preset value), I get an:

IntegrityError at /admin/....../add/
(1062, "Duplicate entry 'myname-test' for key 'name'")

The stack trace is as follows:

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in wrapper
  372.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/cache.py" in _wrapped_view_func
  89.         response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in inner
  202.             return view(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _wrapper
  25.             return bound_func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in bound_func
  21.                 return func(self, *args2, **kwargs2)
File "/usr/local/lib/python2.7/dist-packages/django/db/transaction.py" in inner
  223.                 return func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in add_view
  1007.                 self.save_model(request, new_object, form, False)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in save_model
  740.         obj.save()
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save
  546.                        force_update=force_update, update_fields=update_fields)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save_base
  591.                                update_fields=update_fields)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save_base
  650.                 result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py" in _insert
  215.         return insert_query(self.model, objs, fields, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in insert_query
  1675.     return query.get_compiler(using=using).execute_sql(return_id)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in execute_sql
  937.             cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py" in execute
  41.             return self.cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/mysql/base.py" in execute
  122.             six.reraise(utils.IntegrityError, utils.IntegrityError(*tuple(e.args)), sys.exc_info()[2])
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/mysql/base.py" in execute
  120.             return self.cursor.execute(query, args)
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py" in execute
  174.             self.errorhandler(self, exc, value)
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py" in defaulterrorhandler
  36.     raise errorclass, errorvalue


(FTR, I have also tried overriding the model save(), but again get an IntegrityError, instead of Django performing the expected check).

I am obviously missing some key piece of code, but cannot see what it is.

Thanks
Derek

[Rafael Durán Castañeda]

Hi,

As long as I know, a model form needs the fields to be included in order to get validation working, so I suspect you did something like this:

class ProxyForm(forms.ModelForm):

    class Meta:

        model = models.Myproxy

        fields = ('name', )

Since stuff field is not included in the form fields validation doesn't work for it, however you can get it working with something like this:

class ProxyForm(forms.ModelForm):

    stuff = forms.CharField(widget=forms.HiddenInput, initial='stuff')

    class Meta:

        model = models.Myproxy

        fields = ('name', 'stuff',)

Thought you probably need customize validation/error messages or you will get messages like:

Parent with this Name and Stuff already exists.

for a form that does´t include stuff as a hidden input.

HTH

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