Question

I’m having a hard time understanding the difference the two lines bellow. The only difference is the usage of :url =>

1- The following line in my view is generating an error (removing form_for removes the error and rendering is done with no error):

<%= form_for( [@company, @appointment], :action => 'company_edit', :html => {:class => "form-horizontal"}) do |f| %>

I spent a lot of time trying to make sense of the error, but I do not know where ‘company_edit’is coming from.

ActionView::Template::Error (undefined method `company_appointment_path' for #<#<Class:0x5047cc8>:0x5045070>):
9:       </div>
10:       <div class="widget-content nopadding">
11:         <!--form action="#" method="get" class="form-horizontal"-->
12:         <%= form_for([@company, @appointment], :action => 'company_edit', :html => {:class => "form-horizontal"}) do |f| %>
13:           <% if @appointment.errors.any? %>
14:             <div class="control-group">
15:                 <div id="error_explanation">
app/views/appointments/company_edit.html.erb:12:in `_app_views_appointments_company_edit_html_erb___287242072_42128364'

Here is a snippet of my route file:

resources :companies do

  resources :appointments, only: [:company_edit] do
    member do
      get 'company_edit', :as => :company_edit
    end
  end
end

2- I found that using :url, made all work again, but why?

<%= form_for([@company, @appointment], :url => {:action => 'company_edit'}, :html => {:class => "form-horizontal"}) do |f| %>

I’m trying to understand this since I use ‘form_for’ in many places and I have never used ‘:url =>’ before and I want to know if I was not using ‘form_for’ correctly and that I now need to update my code to properly use the helper.

---

EDIT

This is my controller:

def company_edit
    @appointment = Appointment.find(params[:id])
    @company = Company.find(params[:company_id])

end

Answer 1

I’m afraid the answer to your question is no.

:action is not an options parameter recognized by form_for.

Here’s the API:

http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for

:url is an option it recognizes and itself includes an options hash which includes :action.

I hope that helps.