How active admin works

gistfile1.rb

#Dit is plumbing

class Active
  @@resources = []

  def self.register(type, &block)
    resource = Resource.new(type, &block)
    resource.register
    @@resources << resource
  end
  
  def self.routes(r)
    for a in @@resources 
      a.register_routes r 
    end
  end
end

class Resource 

  def initialize(type, &block)
    @type = type
    @block = block
  end

  def type
    @type
  end

  def controller_name
    "#{@type.to_s.pluralize}Controller"
  end

  def controller_const
    controller_name.constantize
  end

  def register_routes(routes)
    resource_name = type.name.underscore.pluralize.to_sym
    routes.resources resource_name
  end

  def register
    Module.parent.send(:remove_const, controller_name) if Module.const_defined? controller_name
    eval "class ::#{controller_name} < BaseController; end;"
  
    controller_const.register(self)
    instance_eval &@block
  end

  def controller(&block)
    controller_const.class_eval(&block)
  end

  def params_permit!
    puts "WOO"
  end
end

# Dit is de DSL waar je utieindelijk mee moe werken 

Active.register Comment do
  params_permit!

  controller do
    def hello

    end
  end
end

Testapp::Application.routes.draw do
  Active.routes(self)
end