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These attribute are present on all fields; however, they will only have meaningful values if the field is a relation type (. For example, if the `Manufacturer` model a\ bove is defined in another application called `production`, you'd need to use: class Car(models. See the related objects documentation for a full explanation and example.
Django also defines a set of fields that represent relations. Requires a positional argument: the class to which the model is related. Note that you must set this value when defining relations on abstract models; and when you do so some special syntax is available.
Char Field(max_length=255) # That's now the name of the reverse filter Article.objects.filter(tag__name="important") The field on the related object that the relation is to.By default, Django uses the primary key of the related object.Controls whether or not a constraint should be created in the database for this foreign key. Behind the scenes, Django creates an intermediary join table to represent the many-to-many relationship.This may also be a callable, such as a function, which will be called to obtain the upload path, including the filename.This callable must be able to accept two arguments, and return a Unix-style path (with forward slashes) to be passed along to the storage system.