How to pass data to the views Rails

Question

I have form, that send ajax post request to my controller. In my controller I caluculate total price:

def price
  @direction = params[:@directions_ids].to_f
  @kind_of_work = params[:kind_of_work].to_f
  @topic = params[:topic].to_f
  @work_discipline = params[:work_discipline].to_f
  @number_of_pages = params[:number_of_pages].to_f
  @deadline = params[:deadline].to_f
  @singularity = params[:singularity].to_f
  @manual = params[:manual]
  @example = params[:example]
  @total_price = @direction*@kind_of_work*@number_of_pages*@deadline*@singularity
  respond_to do |format|
    format.js
    format.html
  end
end

but i cant use it in my form

<%= f.hidden_field :total_price, :value => @total_price %>

Answer 1

If I understand your question correctly, your price action is handled by the POST request you are making. But you are expecting the instance variable @total_price be available in the form.

You need to set the instance variables in the action that renders the form. Not in the action that processes the form.