Use mixins in schema declarations

Hello. Is there any way to use mixins with umongo Document class? I have following structures:

class A(EmbeddedDocument):
  field1 = StringField()
  field2 = StringField()
  ...
  field99 = StringField()


class B(Document):
  field1 = StringField()
  field2 = StringField()
  ...
  field99 = StringField()
  items = ListField(EmbeddedDocumentField(A))

I want to put all of my fields to another class and use it as mixin for A and B. Is it possible in umongo?

[lafrech]

@gerasim13 #267 should fix this.

There’an an issue with your implementation: the mixin overrides the doc class fields in case of name collision, while expected behaviour would be the doc class overriding the mixin. This is why I use setdefault in #267.

[lafrech]

Right. I just fell into this myself.

I think this could be fixed by modifying _collect_schema_attrs in builder.py. Make it recursive, and change parameter to template instead of template.__dict__.

I don’t have time for this right now but I’d be happy to merge a PR implementing it.