Django’s ManyToMany Relationship with Additional Fields

by

Here is example of what you want to achieve:

http://docs.djangoproject.com/en/dev/topics/db/models/#extra-fields-on-many-to-many-relationships

In case link ever breaks:

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=128)

    def __str__(self):              # __unicode__ on Python 2
        return self.name

class Group(models.Model):
    name = models.CharField(max_length=128)
    members = models.ManyToManyField(Person, through="Membership")

    def __str__(self):              # __unicode__ on Python 2
        return self.name

class Membership(models.Model):
    person = models.ForeignKey(Person)
    group = models.ForeignKey(Group)
    date_joined = models.DateField()
    invite_reason = models.CharField(max_length=64)

More Related Contents:

  1. How to disable Django query cache?
  2. Is it possible to generate django models from the database?
  3. Version of SQLite used in Android?
  4. What are the performance characteristics of sqlite with very large database files? [closed]
  5. Exposing database IDs – security risk?
  6. How can I put a database under git (version control)?
  7. How to use mongoimport to import csv
  8. NoSql vs Relational database
  9. How to recover a corrupt SQLite3 database?
  10. How do IMMUTABLE, STABLE and VOLATILE keywords effect behaviour of function?
  11. Partial Dependency (Databases)
  12. How to display table data more clearly in oracle sqlplus
  13. Can I rollback a transaction I’ve already committed? (data loss)
  14. internationalization in JSF with ResourceBundle entries which are loaded from database
  15. Kill a postgresql session/connection
  16. What is the most efficient way to store tags in a database?
  17. Microservices with shared database? using multiple ORM’s? [closed]
  18. What’s the best strategy for unit-testing database-driven applications?
  19. data block size in HDFS, why 64MB?
  20. Log to a database using log4j
  21. how to use Blob datatype in Postgres
  22. Django Many-to-Many (m2m) Relation to same model
  23. Are database triggers necessary? [closed]
  24. Which is a good design for a database table that can be owned by two different resources, and therefore needs two different foreign keys? [closed]
  25. How can I solve Postgresql SCRAM authentication problem?
  26. many-to-many relationship in database design
  27. How does the HyperLogLog algorithm work?
  28. Android: Where are database files stored?
  29. HTML5 database storage (SQL lite) – few questions
  30. DB design for microservice architecture [closed]

Leave a Comment