object_serializer_caching_spec.rb

require 'spec_helper'

describe FastJsonapi::ObjectSerializer do
  include_context 'movie class'

  context 'when caching has_many' do
    before(:each) do
      rails = OpenStruct.new
      rails.cache = ActiveSupport::Cache::MemoryStore.new
      stub_const('Rails', rails)
    end

    it 'returns correct hash when serializable_hash is called' do
      options = {}
      options[:meta] = { total: 2 }
      options[:links] = { self: 'self' }

      options[:include] = [:actors]
      serializable_hash = CachingMovieSerializer.new([movie, movie], options).serializable_hash

      expect(serializable_hash[:data].length).to eq 2
      expect(serializable_hash[:data][0][:relationships].length).to eq 3
      expect(serializable_hash[:data][0][:attributes].length).to eq 2

      expect(serializable_hash[:meta]).to be_instance_of(Hash)
      expect(serializable_hash[:links]).to be_instance_of(Hash)

      expect(serializable_hash[:included]).to be_instance_of(Array)
      expect(serializable_hash[:included][0]).to be_instance_of(Hash)
      expect(serializable_hash[:included].length).to eq 3

      serializable_hash = CachingMovieSerializer.new(movie).serializable_hash

      expect(serializable_hash[:data]).to be_instance_of(Hash)
      expect(serializable_hash[:meta]).to be nil
      expect(serializable_hash[:links]).to be nil
      expect(serializable_hash[:included]).to be nil
    end

    it 'uses cached values for the record' do
      previous_name = movie.name
      previous_actors = movie.actors
      CachingMovieSerializer.new(movie).serializable_hash

      movie.name = 'should not match'
      allow(movie).to receive(:actor_ids).and_return([99])

      expect(previous_name).not_to eq(movie.name)
      expect(previous_actors).not_to eq(movie.actors)
      serializable_hash = CachingMovieSerializer.new(movie).serializable_hash

      expect(serializable_hash[:data][:attributes][:name]).to eq(previous_name)
      expect(serializable_hash[:data][:relationships][:actors][:data].length).to eq movie.actors.length
    end

    it 'uses cached values for has many as specified' do
      previous_name = movie.name
      previous_actors = movie.actors
      CachingMovieWithHasManySerializer.new(movie).serializable_hash

      movie.name = 'should not match'
      allow(movie).to receive(:actor_ids).and_return([99])

      expect(previous_name).not_to eq(movie.name)
      expect(previous_actors).not_to eq(movie.actors)
      serializable_hash = CachingMovieWithHasManySerializer.new(movie).serializable_hash

      expect(serializable_hash[:data][:attributes][:name]).to eq(previous_name)
      expect(serializable_hash[:data][:relationships][:actors][:data].length).to eq previous_actors.length
    end
  end
end