edit_inline for a reflexive m2m_intermediary

[Nicola Larosa <nico@…>]

This follows the ​m2m_intermediary pattern, but with associations, not between two different models, but between pairs of instances of the *same* model.

Given this Person model:

class Person(models.Model):
    first_name = models.CharField(maxlength = 100)
    last_name = models.CharField(maxlength = 100)

and associating pairs of persons, while adding some data:

class Association(models.Model):
    person = models.ForeignKey(Person, related_name='friend_of')
    associate = models.ForeignKey(Person, related_name='friends')
    some_data = models.IntegerField()

the admin interface for these models works correctly.

Now, to be able to add Associations while editing Persons, add
edit_inline and core to Association fields.

When adding them to both ForeignKey fields:

class Association(models.Model):
    person = models.ForeignKey(Person, related_name='friend_of',
        core=True, edit_inline=models.TABULAR)
    associate = models.ForeignKey(Person, related_name='friends',
        core=True, edit_inline=models.TABULAR)
    dummy = models.IntegerField()

this error comes out:

Traceback (most recent call last):
File ".../django/template/__init__.py" in render_node
  754. result = node.render(context)
File ".../django/template/defaulttags.py" in render
  134. nodelist.append(node.render(context))
File ".../django/contrib/admin/templatetags/admin_modify.py" in render
  171. bound_related_object = relation.bind(
           context['form'], original, bound_related_object_class)
File ".../django/db/models/related.py" in bind
  129. return bound_related_object_class(self, field_mapping, original)
File ".../django/contrib/admin/templatetags/admin_modify.py" in __init__
  138. for (i,field_mapping) in self.field_mappings.items() ]
File ".../django/oldforms/__init__.py" in items
  264. self.fill()
File ".../django/oldforms/__init__.py" in fill
  283. field = self.parent_manipulator[full_field_name]
File ".../django/oldforms/__init__.py" in __getitem__
  28. raise KeyError, "Field %s not found\n%s" % (
          field_name, repr(self.fields))

  KeyError at /admin/person/add/
  'Field association.0.associate not found
  [FormField "first_name", FormField "last_name",
   FormField "association.0.id", FormField "association.0.person",
   FormField "association.0.dummy",
   FormField "association.1.id", FormField "association.1.person",
   FormField "association.1.dummy",
   FormField "association.2.id", FormField "association.2.person",
   FormField "association.2.dummy",
   FormField "association.0.id", FormField "association.0.person",
   FormField "association.0.dummy",
   FormField "association.1.id", FormField "association.1.person",
   FormField "association.1.dummy",
   FormField "association.2.id", FormField "association.2.person",
   FormField "association.2.dummy"]'

When adding edit_inline and core to the first ForeignKey field only:

class Association(models.Model):
    person = models.ForeignKey(Person, related_name='friend_of',
        core=True, edit_inline=models.TABULAR)
    associate = models.ForeignKey(Person, related_name='friends')
    dummy = models.IntegerField()

this other error come out:

Traceback (most recent call last):
File ".../django/template/__init__.py" in render_node
  754. result = node.render(context)
File ".../django/template/defaulttags.py" in render
  134. nodelist.append(node.render(context))
File ".../django/contrib/admin/templatetags/admin_modify.py" in render
  171. bound_related_object = relation.bind(
           context['form'], original, bound_related_object_class)
File ".../django/db/models/related.py" in bind
  129. return bound_related_object_class(self, field_mapping, original)

  TypeError at /admin/person/add/
  'bool' object is not callable

[Nicola Larosa <nico@…>]

This is an exact duplicate of #1939, sorry for not seeing it before.