Support for Django 1.8 ArrayField

[jpadilla]

Add models.ArrayField in Django 1.8 to serializers.ListField mapping by default when using a ModelSerializer.

>>> print(ChessBoardSerializer())
ChessBoardSerializer():
    board = ListField(validators=[<django.contrib.postgres.validators.ArrayMaxLengthValidator object>])

[tomchristie]

Nice. We'll also want to figure out how to populate the child argument.

[jpadilla]

@tomchristie doh yeah, completely missed that. Working on it.

[jpadilla]

@tomchristie not sure if that's the best solution. Thoughts?

>>> ChessBoardSerializer()
ChessBoardSerializer():
    board = ListField(child=CharField(allow_blank=True, allow_null=True, label='Board', max_length=10, required=False), validators=[<django.contrib.postgres.validators.ArrayMaxLengthValidator object>])

[tomchristie]

Very nice! 🚀

I tried adding a test and bumped into the fairly major issue that we'd need to start using postgres as our test database (no, I don't want us to have to do that).

Only thing I'd like to see before we commit this is a double check that it really does work for nested array fields. The example you gave above doesn't quite match up to the example in the Django docs, as the representation is only listing ListField(child=CharField()), not ListField(child=ListField(child=CharField()))` - once that's double checked I'm happy for this to go in.

[jpadilla]

@tomchristie yeah I'm looking into that. I did model_field.base_field.base_field which was obviously wrong. That should be kind of an easy fix. Also, should we doing anything with ArrayField.size?

[jpadilla]

@tomchristie yeah I think that was an easy fix.

>>> ChessBoardSerializer()
ChessBoardSerializer():
    board = ListField(
        child=ListField(
            child=CharField(allow_blank=True, allow_null=True, label='Board', max_length=10, required=False),
            label='Board',
            validators=[<django.contrib.postgres.validators.ArrayMaxLengthValidator object>]
        ),
        validators=[<django.contrib.postgres.validators.ArrayMaxLengthValidator object>]
    )

Does that look good?

[tomchristie]

Stellar! 🌟