Custom TYPE_MAPPING

I am extending the Schema class from marshmallow for my schemas and extending the TYPE_MAPPING attribute, but because of these lines here, the ModelConverter doesn’t pick up my changes, because it hardcodes marshmallow’s Schema class.

from datetime import datetime
from marshmallow import Schema

[...]

class BaseSchema(Schema):

    TYPE_MAPPING = Schema.TYPE_MAPPING.copy()
    TYPE_MAPPING.update({
        datetime: APIDateTime,
    })

    def __init__(self, *args, **kwargs):
        if 'strict' not in kwargs:
            kwargs['strict'] = True
        super(BaseSchema, self).__init__(*args, **kwargs)

How do I override the mapping in marshmallow-sqlalchemy for datetime => my own custom field?

[fuhrysteve]

Hmm, not sure if I am misunderstanding your issue or not, but you could also do something like this if you wanted something resembling a custom TYPE_MAPPING in your BaseSchema:

class BaseSchema(ModelSchema):
    class Meta:
        model_converter = MyDefaultConverter
        # other defaults

class MyModelSchema(BaseSchema):
    class Meta(BaseSchema.Meta):
        # MyModelSchema specific customizations
        pass

The only downside is that you need to remember to have your Meta classes extend BaseSchema.Meta if you want to customize it further.

[imhoffd]

Awesome, @sloria! Thank you.