ActiveModel :: Serializer：与联接表一起使用的推荐方式（has_many至）

Question

I'm facing a case when a need to display information contained in my join table. For example:

# == Schema Information
#
# Table name: quality_inspections
#
#  id, content
#
# =============================================================================

class QualityInspection
  has_many :inspection_inspectors
  has_many :inspector, through: :inspection_inspectors
end

# == Schema Information
#
# Table name: inspection_inspectors
#
#  quality_inspection_id, inspector_id, inspection_date
#
# =============================================================================

class InspectionInspector
  belongs_to :quality_inspection
  belongs_to :user, foreign_key: :inspector_id
end

Then, I'd like to have the following json:

{
  "quality_inspectors": [{
    "id": 1,
    "content": "foo",
    "inspectors": [{
      "id": 1, // which is the user's id
      "first_name": "Bar",
      "last_name": "FooFoo",
      "inspection_date": "random date"
    }]
  }]
}

For now, I'm doing the following in my serializer:

module Api::V1::QualityInspections
  class InspectorSerializer < ActiveModel::Serializer
    type :inspector

    attributes :id, :first_name, :last_name, :inspection_date

    def id
      inspector.try(:public_send, __callee__)
    end

    def first_name
      inspector.try(:public_send, __callee__)
    end

    def last_name
      inspector.try(:public_send, __callee__)
    end

    private

    def inspector
      @inspector ||= object.inspector
    end
  end
end

Do you have any better solution ? Or maybe I'm not using the right methods on my Serializer ?

Anyway, I'm really stuck when it came to display information on a join table. Oddly, I'd the same issue when using cerebris/jsonapi-resources.

EDIT: Linked issue on GH: https://github.com/rails-api/active_model_serializers/issues/1704

Answer 1

I don't think you need to put additional methods such as id, first_name, last_name. Instead, use association within your serializer to get the appropriate JSON data as mentioned afore.