JSON API - Helper methods for controllers

jsonapi_utils_lib.rb

module JsonapiUtils
 extend ActiveSupport::Concern

 include do
   helper_method :jsonapi_serialize, :jsonapi_serialize_collection
 end

 def jsonapi_serialize_collection(records)
   records = records.map { |record| @request.resource_klass.new(record) }
   jsonapi_serialize(records)
 end

 def jsonapi_serialize(records)
   is_collection = records.is_a?(Array)
   resources = is_collection ? records : @request.resource_klass.new(records)
   @included = params[:include].present? ? params[:include].split(',') : []
   @resources =
     JSONAPI::ResourceSerializer.new(
       @request.resource_klass,
       include: @included,
       fields: @request.fields
     ).serialize_to_hash(resources)

     if is_collection
       @resources.merge({
         meta: {
           record_count: records.size.zero? ? 0 : records.first.model.class.count
         }
       })
     else
       @resources
     end
  end
end