bug with polymorphic relationship

[senid231]

when primary_key is changed on resource level id mismatch between relatioship linkage and included data.
Reproduced in bug report template according to PR #980 proposal

Models

class Storage < ActiveRecord::Base
  has_one :keeper, class_name: 'Keeper', as: :keepable
end

class Keeper < ActiveRecord::Base
  belongs_to :keepable, polymorphic: true
end

resources

class StorageResource < JSONAPI::Resource
  model_name 'Storage'
  key_type :string
  primary_key :token

  attribute :name
end

class KeeperResource < JSONAPI::Resource
  model_name 'Keeper'
  has_one :keepable, polymorphic: true

  attribute :name
end

class KeepableResource < JSONAPI::Resource
end

Data

storage = Storage.create! name: 'Warehouse 1', token: 'some-token'
Keeper.create! name: 'John Doe', keepable: storage

Response

{
  "data": {
    "id": "1",
    "type": "keepers",
    "links": {
      "self": "http://example.org/keepers/1"
    },
    "attributes": {
      "name": "John Doe"
    },
    "relationships": {
      "keepable": {
        "links": {
          "self": "http://example.org/keepers/1/relationships/keepable",
          "related": "http://example.org/keepers/1/keepable"
        },
        "data": {
          "type": "storages",
          "id": "1"
        }
      }
    }
  },
  "included": [
    {
      "id": "some-token",
      "type": "storages",
      "links": {
        "self": "http://example.org/storages/some-token"
      },
      "attributes": {
        "name": "Warehouse 1"
      }
    }
  ]
}

as you see included data for storages has "id: "some-token", but keepable relationship linkage has "id": "1"