I have three objects:
Thing some fields Bucket things = models.ManyToManyField(Thing) User buckets = models.ManyToManyField(Bucket) things = models.ManyToManyField(Thing)
When editing my "Bucket" field in the admin, I want to be able to select Things, but only those things that are in the "Things" list on the user currently logged in.
How can I do that? In other words, how can I filter the list of Things in the Bucket admin?
Thank you very much for your help in advance.
A ManyToManyField in Django is a field that allows multiple objects to be stored. This is useful and applicable for things such as shopping carts, where a user can buy multiple products. To add an item to a ManyToManyField, we can use the add() function.
Django-property-filter is an extension to django-filter and provides functionality to filter querysets by class properties. It does so by providing sub-classes for Filters and Filtersets to keep existing django-filter functionality. For more details and examples check the documentation.
There is a formfield_for_manytomany. Usage is similar to the answer given by defuz.
ModelAdmin.formfield_for_manytomany(db_field, request, **kwargs)¶
Like the
formfield_for_foreignkey
method, theformfield_for_manytomany
method can be overridden to change the default formfield for a many to many field. For example, if an owner can own multiple cars and cars can belong to multiple owners – a many to many relationship – you could filter the Car foreign key field to only display the cars owned by the User:class MyModelAdmin(admin.ModelAdmin): def formfield_for_manytomany(self, db_field, request, **kwargs): if db_field.name == "cars": kwargs["queryset"] = Car.objects.filter(owner=request.user) return super(MyModelAdmin, self).formfield_for_manytomany(db_field, request, **kwargs)
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