`exclude` in Meta breaks with marshmallow 3

We have a pattern where we exclude some relations from the marshmallow schema like this:

class CustomerSchema(MyBaseSchema):
    class Meta(MyBaseSchema.Meta):
        model = Customer
        exclude = ('orders',)

Where Customer is a sqlalchemy model and orders is a relation from another table.

This works fine with marshmallow 2.x, but with marshmallow 3, an exception is thrown in the instantiation of CustomerSchema because marshmallow-sqlalchemy did not create the orders field, and so orders doesn’t exist to be excluded.

See also https://github.com/marshmallow-code/marshmallow/issues/877

[sloria]

Yeah, dependent builds would be a nice feature in Travis. Shame that it’s not on the roadmap.

Nice work finding that test @deckar01 .

I won’t have time to look into this bug this week. @deckar01 or @yaheath would you be up for sending a PR?

[sloria]

The bugfix is released in 0.14.1.