What is the form_for syntax for nested resources?

Question

I am trying to create a form for a nested resource. Here is my route:

map.resources :websites do |website|
  website.resources :domains
end

Here are my attempts and the errors:

<% form_for(@domain, :url => website_domains_path(@website)) do | form | %>
<%= form.text_field :name %>

# ArgumentError: wrong number of arguments (1 for 0)
# form_helper.rb:290:in 'respond_to?'
# form_helper.rb:290:in 'apply_form_for_options!'
# form_helper.rb:277:in 'form_for'

<% form_for([@website, @domain]) do | form | %>
<%= form.text_field :name %>

# ArgumentError: wrong number of arguments (1 for 0)
# form_helper.rb:290:in 'respond_to?'
# form_helper.rb:290:in 'apply_form_for_options!'
# form_helper.rb:277:in 'form_for'

<% form_for(:domain, @domain, :url => website_domains_path(@website)) do | form | %>
<%= form.text_field :name %>

# ArgumentError: wrong number of arguments (1 for 0)
# wrapper.rb:14:in 'respond_to?'
# wrapper.rb:14:in 'wrap'
# active_record_helper.rb:174:in 'error_messages_for'

<% form_for(:domain, [@website, @domain]) do | form | %>
<%= form.text_field :name %>

# UndefinedMethodError 'name' for #<Array:0x40fa498>

I have confirmed both @website and @domain contain instances of the correct class.

The routes also generate correctly is used like this for example, so I dont think their is an issue with the route or url helpers.

<%= website_domains_path(1) %>
<%= website_data_source_path(1, 1) %>

Rails 2.3.5

Hock · Accepted Answer · 2013-10-08 12:15:49Z

1

You can use

<%= form_for [@website, @domain] %>

Where @domain belongs to @website

edited Oct 8, 2013 at 12:15

user1930607

answered Mar 20, 2010 at 3:54

Hock

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1 Comment

Kris Over a year ago

Even though the solution to my problem it is the correct answer to the question and I would prefer to award the points to someone other than myself!

klew · Accepted Answer · 2010-03-18 11:46:32Z

1

I've just tried:

<% form_for @note, :url => teams_person_notes_path(@person) do |f| %>
  <%= f.text_field :note %>
  <%= f.submit "Add" %>
<% end %>

and it works without any problem. My routes looks like this:

  map.namespace :teams do |t|
    t.resources :people do |p|
      p.resources :notes
    end
  end

So it is the same as yours (only namespace is added, but it's not a case).

Of Course, your example form is for new object of @domain. It won't work for edit action, then you should have:

 <% form_for @domain, :url => edit_website_domain_path(@website, @domain) do |form| %>

answered Mar 18, 2010 at 11:46

klew

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2 Comments

Kris Over a year ago

This could be a deeper problem than I first thought. The form example is for a new object, ie. @domain.new_record? # => true.

klew Over a year ago

I think that your second example also should work, but both for new and edit. So probably you have error somewhere else. Do you have all blocks closed with end? Or, try to remove all fields from form.

Kris · Accepted Answer · 2010-03-18 15:34:25Z

0

This was so obvious when it finally clicked, I had a field called respond_to. It was of course overriding an existing method.

Its a shame ActiveRecord does not warn when a database column will overwrite an already defined method...

answered Mar 18, 2010 at 15:34

Kris

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