How to get the current model instance from inlineadmin in Django

Question

I am using the formfield_for_manytomany given in django documentation. But inside that function I need to get the current parent object being edited.

def formfield_for_manytomany(self, db_field, request, **kwargs):     if db_field.name == "car":         kwargs["queryset"] = Cars.objects.filter(owner=person)     return super(myModel, self).formfield_for_manytomany(db_field, request, **kwargs) 

How can I get the person being edited?

Answer 1

If the person cannot be easily got from request, you may need to manually pass it by overriding ModelAdmin.get_form() or InlineModelAdmin.get_formset():

from functools import partial  class MyModelAdmin(admin.ModelAdmin):     def get_form(self, request, obj=None, **kwargs):         kwargs['formfield_callback'] = partial(self.formfield_for_dbfield, request=request, obj=obj)         return super(MyModelAdmin, self).get_form(request, obj, **kwargs)      def formfield_for_dbfield(self, db_field, **kwargs):         person = kwargs.pop('obj', None)         formfield = super(MyModelAdmin, self).formfield_for_dbfield(db_field, **kwargs)         if db_field.name == "car" and person:             formfield.queryset = Cars.objects.filter(owner=person)         return formfield   # or its inline class MyInlineModelAdmin(admin.StackedInline):     def get_formset(self, request, obj=None, **kwargs):         kwargs['formfield_callback'] = partial(self.formfield_for_dbfield, request=request, obj=obj)         return super(MyInlineModelAdmin, self).get_formset(request, obj, **kwargs)      def formfield_for_dbfield(self, db_field, **kwargs):         person = kwargs.pop('obj', None)         formfield = super(MyInlineModelAdmin, self).formfield_for_dbfield(db_field, **kwargs)         if db_field.name == "car" and person:             formfield.queryset = Cars.objects.filter(owner=person)         return formfield  

Or

class MyModelAdmin(admin.ModelAdmin):     def get_form(self, request, obj=None, **kwargs):         kwargs['formfield_callback'] = partial(self.formfield_for_dbfield, request=request, obj=obj)         return super(MyModelAdmin, self).get_form(request, obj, **kwargs)      def formfield_for_dbfield(self, db_field, **kwargs):         if db_field.name != "car":             kwargs.pop('obj', None)         return super(MyModelAdmin, self).formfield_for_dbfield(db_field, **kwargs)      def formfield_for_manytomany(self, db_field, request=None, **kwargs):         person = kwargs.pop('obj', None)         if db_field.name == "car" and person:             kwargs['queryset'] = Cars.objects.filter(owner=person)         return super(MyModelAdmin, self).formfield_for_manytomany(db_field, request, **kwargs)