Working with model field relationships

Django provides three relationship types for linking tables:

• Many–to–one
• Many–to–many
• One–to–one

A many-to-one relationship is defined by using a ForeignKey field, and the other two relationship types are defined using the self-explanatory ManyToManyField and OneToOneField. These fields are named appropriately after the relationship type that they represent.

Next, we will discuss the key components of working with model field relationships.

Field arguments

The three field types, ForeignKey, ManyToManyField, and OneToOneField, all accept the standard default, blank, and verbose_name field arguments that other field types accept. The null argument will have no effect on a ManyToManyField and will only apply to the ForeignKey and OneToOneField types. Two of these field types—ForeignKey and OneToOneField—require at least two positional arguments, the first being...