A simple InlineModelAdmin class that enables you to edit models that are bound by the instance via a generic foreign key (content_type, object_id pair)
Use like:
class PlacementInlineOptions( generic.GenericTabularInline ):
model = Placement
extra = 2
ct_field_name = 'target_ct'
id_field_name = 'target_id'
Can be also found at #4667
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | from django.contrib.contenttypes.models import ContentType
from django.newforms.models import BaseModelFormSet, _modelformset_factory, save_instance
from django.contrib.admin.options import InlineModelAdmin, flatten_fieldsets
from django.db.models import ForeignKey
class GenericInlineFormset(BaseModelFormSet):
"""A formset for child objects related to a parent."""
def __init__(self, instance=None, data=None, files=None):
self.instance = instance
self.rel_name = '-'.join( ( self.model._meta.app_label, self.model._meta.object_name.lower(), self.ct.name, self.obj_id.name ) )
super(GenericInlineFormset, self).__init__(queryset=self.get_queryset(), data=data, files=files, prefix=self.rel_name)
def get_queryset(self):
if self.instance is None:
return []
return self.model._default_manager.filter( **{
self.ct.name : ContentType.objects.get_for_model(self.instance),
self.obj_id.name : self.instance.pk
})
def save_new(self, form, commit=True):
kwargs = {
self.ct.get_attname(): ContentType.objects.get_for_model(self.instance).pk,
self.obj_id.get_attname(): self.instance.pk,
}
new_obj = self.model(**kwargs)
return save_instance(form, new_obj, commit=commit)
class GenericInlineModelAdmin(InlineModelAdmin):
ct_field_name = None
id_field_name = None
formset = GenericInlineFormset
def get_formset( self, request, obj=None ):
if self.declared_fieldsets:
fields = flatten_fieldsets(self.declared_fieldsets)
else:
fields = None
opts = model._meta
# if there is no field called `ct_field_name` let the exception propagate
ct = opts.get_field(ct_field_name)
if not isinstance(ct, ForeignKey) or ct.rel.to != ContentType:
raise Exception("fk_name '%s' is not a ForeignKey to ContentType" % (ct_field_name))
obj_id = opts.get_field(id_field_name) # let the exception propagate
FormSet = _modelformset_factory(self.model, form=self.form,
formfield_callback=self.formfield_for_dbfield,
formset=self.formset,
extra=self.extra, fields=fields, exclude=[ct.name, obj_id.name] )
FormSet.ct = ct
FormSet.obj_id = obj_id
return FormSet
class GenericStackedInline(GenericInlineModelAdmin):
template = 'admin/edit_inline/stacked.html'
class GenericTabularInline(GenericInlineModelAdmin):
template = 'admin/edit_inline/tabular.html'
|
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Comments
I'm a bit confused about how to use this. Does it require patch #4677 to be applied to my local copy of the NFA branch? I tried simply taking this snippet and creating a generic.py file inside django.contrib.admin. But when trying to use it, I get a NameError exception stating that "global name 'model' is not defined" at line 41.
#
Im guessing this code no longer applies, I get the following error:
ImportError: cannot import name _modelformset_factory
#
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