Rails Form block in helper - How do i include "Protect from forgery"

Question

I'm trying to build a form block for my liquid theme language. I have based my approach on this answer. How ever the answer seems to be incomplete.

The problem is that protect from forgery and some other methods are unavailable. Causing an error:

Liquid error: undefined method `protect_against_forgery?' for #

This is my code:

   class LiquidFormTag < Liquid::Block

        include ActionView::Context
        include ActionView::Helpers::FormHelper

        def initialize(tag_name, markup, tokens)

            super
        end

        def render(context)
            form_tag("#") do

                super
            end
        end
    end

    Liquid::Template.register_tag('liquid_form', LiquidFormTag)

Does any one know how i add the protect_against_forgery method do this class?

Edit: this is the error output:

Edit 2:

This is the relevant part of my Liquid code:

{% ticket_form %}
    {% for offer in event.offers %}

        <div class="well well-sm">  
            <div class="row">
                <div class="col-xs-3 col-sm-5 col-md-6 col-lg-7">
                    <h5>{{offer.name}}</h5>
                </div>
                <div class="col-xs-9 col-sm-7 col-md-6 col-lg-5 pull-right">
                    <div class="input-group">
                        <span class="input-group-addon">{{offer.price}}</span>
                        <input type="email" class="form-control tickets-count" cols="2" id="exampleInputEmail1" placeholder="0">
                        <span class="input-group-btn">
                            <button type="button" class="btn btn-default"><i class="fa fa-plus"></i></button>
                            <button type="button" class="btn btn-default"><i class="fa fa-minus"></i></button>
                        </span>
                    </div>
                </div>
            </div>
        </div>

    {% endfor %}
{% endticket_form %}

Answer 1

I agree to Rodrigo but it will be hard to identify method names that will be deleagated to controller.

That's why I prefer to extend Liquid::Block class and delegate missing methods to controller if responds..

class LiquidFormTag < Liquid::Block
  include ActionView::Context
  include ActionView::Helpers::FormHelper

  attr_reader :controller

  def initialize(tag_name, markup, tokens)
    super
  end

  def render(context)
    @controller = context.registers[:controller]
    form_tag('#') do
      super(context).html_safe
    end
  end

end


Liquid::Block.class_eval do
  # This delegates missing - including private & protected - methods (like protect_against_forgery?) to controller.
  def method_missing(*args)
    begin
      if controller.respond_to?(args.first, true)
        controller.send(args.first)
      else
        super
      end
    rescue
      super
    end
  end
end