Django Model Relations
Django models operate by default on relational database systems (RDBMS) and support relationships.
Django Follows the 3 model Relationships:
1- One-To-One Relationship
2- One-To-Many Relationship
3- Many-To-Many Relatiosnship
One-To-One Relationship (OneToOneField)
One record in a table is associated with one and only one record in another table.
- Car company can have only one CEO.
- CEO can work only one Car company.
For more information about one-to-one relationship, you can check :
One-To-Many Relationship (ForeignKey)
One record in a table can be associated with one or more records in another table.
- Car company can have one or more car model.
- Car model can only belong to one car company.
For more information about one-to-many relationship, you can check :
Many-To-Many Relationship (ManyToManyField)
Multiple records in a table are associated with multiple records in another table.
- Many car models can run on same fuel type.
- Car model can run on diffrent fuel types.
For more information about many-to-many relationship, you can check :
Polymorphic Relationship
With Django’s Generic Relation — Polymorphic One-To-Many
One record in a multiple table can be associated with one or more records in another table.
- Sony can be sound system of many car models
- Pioneer can be sound system of many car models
- Car model can have only one sound system (Sony or Pioneer)
With Django-Polymorphic Package
Polymorphic One-To-Many
One record in a multiple table can be associated with one or more records in another table.
- Sony can be sound system of many car models
- Pioneer can be sound system of many car models
- Car model can have only one sound system (Sony or Pioneer)
Polymorphic Many-To-Many
Multiple records in a multiple table are associated with multiple records in another table.
- 2WD can be drive wheel system of many car models
- 4WD can be drive wheel system of many car models
- Car model can have many drive wheel system (2WD or/and 4WD)
For more information about polymorphic relationship, you can check :
If you want to learn more about Django, do check out the documentation, and make sure to check out our articles!
