Arrayfield in Django

Question

my code:

pagerange_str_array = ArrayField(models.CharField(max_length=10,
                                 blank=True, default=list()))

docs example: https://docs.djangoproject.com/en/2.0/ref/contrib/postgres/fields/

board = ArrayField(
    ArrayField(
        models.CharField(max_length=10, blank=True),
        size=8,
    ),
    size=8,
)

docs - size: This is an optional argument.

error message:

DETAIL: Array value must start with "{" or dimension information.

But none of these work: default={}, '{}',or {''} They all get the same error message.

docs: If you give the field a default, ensure it’s a callable such as list (for an empty default) or a callable that returns a list (such as a function)

But none of these work either: default=list, list(). null=True (my original code) also does not work.

All these examples give the same error. I have seen non-Django solutions on the web, but what is an example of code that works in Django?! Thanks.

Solution

In your case you are talking about 1-dim array, and it should be smth like that:

board = ArrayField(
    ArrayField(
        models.CharField(max_length=10, blank=True),
        size=8,
    ),
    size=1,
)

so in your case smth like:

pagerange_str_array = ArrayField(
    ArrayField(
        models.CharField(max_length=10, blank=True)
    ),
    size=1
)

Comments

[Paulo Almeida]

This is probably not the issue, but your default is in the CharField, not in the ArrayField.

[Malik A. Rumi]

I've never seen it done that way, but perhaps a good tip. Thanks.

[Malik A. Rumi]

Ok, that makes sense. I thought if there was nothing there about size, then by default the dimensions would match.