Cannot create custom model fields as in Django 1.9 documentation

Question

Trying to follow the example mentionned in Django 1.9 documentation, I'm unable to make it works as described.

Here's the code I'm stuck with :

fields.py

class Hand(object):
    """A hand of cards (bridge style)"""

    def __init__(self, north, east, south, west):
        # Input parameters are lists of cards ('Ah', '9s', etc)
        self.north = north
        self.east = east
        self.south = south
        self.west = west


class HandField(models.Field):

    def __init__(self, *args, **kwargs):
        kwargs['max_length'] = 104
        super(HandField, self).__init__(*args, **kwargs)

    def deconstruct(self):
        name, path, args, kwargs = super(HandField, self).deconstruct()
        del kwargs["max_length"]
        return name, path, args, kwargs

models.py

from django.db import models
from .fields import HandField

class Game(models.Model)
    hand = HandField()

However, when trying to migrate, I see the hand column is not created :

...
-- Create model Game
--
CREATE TABLE "django_quizz_game" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT);
--
...

What am I missing ? btw, I can't figure out where the relationship between the Hand class and the HandField class (should) occur.

Have you read the whole of that documentation page? Your HandField class is incomplete and needs a lot more adding to it before it can be migrated. — solarissmoke, Apr 16 '16 at 08:09
Thank you for the answer. English is not my mother tongue and it was not clear for me that I had to go through "useful methods" to make it work. — Lapin-Blanc, Apr 16 '16 at 11:49

Cannot create custom model fields as in Django 1.9 documentation

0 Answers0