hopsoft/self_renderer

require "json"
require "active_support/core_ext/string/inflections"
require "self_renderer/version"

module SelfRenderer
  # Renders an string representing this object using the specified template or partial
  def render_with(template: nil, partial: nil, assigns: {}, locals: {})
    name          = self.class.name.parameterize(separator: "_").to_sym
    assigns[name] = self
    locals[name]  = self
    return self_renderer.render(template, assigns: assigns, locals: locals).squish if template.present?
    return self_renderer.render(partial: partial, assigns: assigns, locals: locals).squish if partial.present?
    nil
  end

  # Returns a Hash representation of this object as rendered by #render_to_json
  def render_to_hash(template: nil, partial: nil, assigns: {}, locals: {})
    raise ArgumentError.new("Must use json template") unless template.nil? || template.to_s.include?(".json")
    raise ArgumentError.new("Must use json partial") unless partial.nil? || partial.to_s.include?(".json")
    JSON.load render_with(template: template, partial: partial, assigns: assigns, locals: locals)
  end

  protected

    def self_renderer
      @self_renderer ||= begin
        renderer = ApplicationController.renderer.new

        # get around limitations in devise/warden when rendering views outside the contect of a formal http request
        if defined? Warden
          env = renderer.instance_eval { @env }
          warden = Warden::Proxy.new(env, Warden::Manager.new(Rails.application))
          env["warden"] = warden
        end

        renderer
      end
    end
end