Django Model MultipleChoice

Question

I know there isn't MultipleChoiceField for a Model, you can only use it on Forms.

Today I face an issue when analyzing a new project related with Multiple Choices.

I would like to have a field like a CharField with choices with the option of multiple choice.

I solved this issue other times by creating a CharField and managed the multiple choices in the form with a forms.MultipleChoiceField and store the choices separated by commas.

In this project, due to configuration, I cannot do it as I mention above, I need to do it in the Models, and I prefer NOT to edit the Django admin form neither use forms. I need a Model Field with multiple choices option

• Have someone solved anything like this via Models ?

Maybe overriding some of the models function or using a custom widget... I don't know, I'm kinda lost here.

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Edit

I'm aware off simple choices, I would like to have something like:

class MODEL(models.Model):     MY_CHOICES = (         ('a', 'Hola'),         ('b', 'Hello'),         ('c', 'Bonjour'),         ('d', 'Boas'),     )     ...     ...     my_field = models.CharField(max_length=1, choices=MY_CHOICES)     ... 

but with the capability of saving multiple choices not only 1 choice.

Answer 1

You need to think about how you are going to store the data at a database level. This will dictate your solution.

Presumably, you want a single column in a table that is storing multiple values. This will also force you to think about how you will serialize - for example, you can't simply do comma separated if you need to store strings that might contain commas.

However, you are probably best off using a solution like django-multiselectfield

Answer 2

In case You are using Postgres consider using ArrayField.

from django.db import models from django.contrib.postgres.fields import ArrayField  class WhateverModel(models.Model):     WHATEVER_CHOICE = u'1'     SAMPLE_CHOICES = (         (WHATEVER_CHOICE, u'one'),     )     choices = ArrayField(         models.CharField(choices=SAMPLE_CHOICES, max_length=2, blank=True, default=WHATEVER_CHOICE),     )