Rendering problem

admin_controller.rb

module Admin
  class AdminController < ApplicationController

    def initialize
      @datatable_class = "#{self.class.to_s.gsub("Controller", "Datatable")}".constantize
      @model_class = "Object::#{self.class.to_s.gsub("Admin::", "").gsub("Controller", "").singularize}".constantize
      @param_path = "#{@model_class.to_s.gsub("::", "_").downcase}"
      @model_name = "#{@model_class.to_s.demodulize.downcase}"
    end

    def index
      respond_to do |format|
        format.html
        format.json {
          @records = @model_class.all
          render json: @datatable_class.new(view_context, @model_class)
        }
      end
    end
  end
end

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
end

my_models_controller.rb

module Admin
  module MyModule
    class MyModelsController < Admin::AdminController
    end
  end
end