Configuring a custom JSONField to be treated like a django.db.models.fields.TextField

[Michael Jones]

Hi,

My app is using a custom field that subclasses the JSONField provided by this project:

    https://github.com/bradjasper/django-jsonfield

Unfortunately for reasons beyond my experience, when south does a data-migration with this simple rule setup:

    from south.modelsinspector import add_introspection_rules

    add_introspection_rules([], ["^top\.modelfields\.DescriptionField"])

The json data is escaped inappropriately. I think this is to do with the JSONField implementation and how it figures out when to encode & decode the json data. 

I have found a work around which is to generate the migration script and then edit the field entries like so:

-            'description': ('top.modelfields.DescriptionField', [], {'default': '[]', 'blank': 'True'}),

+            # Tell south that the description field is actually just a text field

+            'description': ('django.db.models.fields.TextField', [], {'default': '[]', 'blank': 'True'}),

Unfortunately, whilst this works, I have to remember to do and as a recent experience as proven, I don't always do that.

Is there a way I can tell South to treat the field as a TextField for these migrations? Or would there be a better way to approach the situation? Ideally the JSONField implementation would be fixed, but I don't understand how to do that currently.

Any help would be much appreciated,

Michael

[Andrew Godwin]

You should implement the south_field_triple method on the custom class and make it return the TextField path as the first argument. Docs here: http://south.readthedocs.org/en/latest/customfields.html#south-field-triple

Andrew

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[Michael Jones]

Fantastic, thank you and sorry for not realising that was part of the docs. I did try, but I apparently failed.

Much appreciated,

Michael