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Schema serialization and deserialization is not symmetric? #419

@jeff-bonevich

Description

@jeff-bonevich

If I try to dump a an object with a relationship, then deserialize the output, i do not get the same object - the relationship is now represented as the id of the related schema.

from marshmallow_jsonapi import fields, Schema
from pprint import pprint


class TeamSchema(Schema):
    id = fields.Int()
    name = fields.Str(required=True)

    class Meta:
        type_ = 'team'


class AssetSchema(Schema):
    id = fields.Int()
    name = fields.Str(required=True)

    team = fields.Relationship(
        include_resource_linkage=True,
        type_='team',
        schema='TeamSchema',
        id_field='id'
    )

    class Meta:
        type_ = 'asset'


data = {'name': 'Asset#1', 'team': {'id': 456}}
print('Input data:')
pprint(data)

asset_serialized = AssetSchema().dump(data)
print('*****DUMP (SERIALIZED) *****')
pprint(asset_serialized)

asset_deserialized = AssetSchema(include_data=('team',)).load(asset_serialized)
print('*****LOAD (DESERIALIZED) *****')
print('Deserialized vs original data:')
pprint(asset_deserialized)
pprint(data)

Output is:

Input data:
{'name': 'Asset#1', 'team': {'id': 456}}
*****DUMP (SERIALIZED) *****
{'data': {'attributes': {'name': 'Asset#1'},
          'relationships': {'team': {'data': {'id': '456', 'type': 'team'}}},
          'type': 'asset'}}
*****LOAD (DESERIALIZED) *****
Deserialized vs original data:
{'name': 'Asset#1', 'team': 456}
{'name': 'Asset#1', 'team': {'id': 456}}

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