RESTful routes: How to code the "create" form correctly

Rails
1

Hi there,

I’ve been trying to fix this for the whole afternoon, but don’t get it
to work:

I have:

-> Nested RESTful resources/routes like this:

map.resources :users, :member => { :enable => :put, :view => :get } do
|users|
users.resource :account
users.resources :roles
users.resources :messages
end

-> A link on a page (should bring up a form for a new message
“new.html.erb”):

<%= link_to ‘Send a message’, new_user_message_path(@user, :target_id
=> @member.id) %>

-> The “MessagesController” like this:

def new
@target = User.find(params[:target_id])
@message = Message.new
end

-> And the message form “new.html.erb” like this:

<% form_for @message do |f| %>


Subject:
<%= f.text_field :subject, :focus => true %>


[…etc…]
<% end %>

…but I get the error:

NoMethodError in Messages#new
Showing messages/new.html.erb where line #4 raised:
undefined method `messages_path’ for #ActionView::Base:0x554b884

Line 4 is: <% form_for @message do |f| %>

As far as I know, with RESTful routes, it’s sufficient to only have the
“@message” in the form header. Rails 2.0 should automatically understand
that “@message” is a new message and therefor redirect me to the “new”
form, right?

Thank you very much for any hint which could help me get out of the
mess!
Tom

2

NoMethodError in Messages#new
Showing messages/new.html.erb where line #4 raised:
undefined method `messages_path’ for #ActionView::Base:0x554b884

Line 4 is: <% form_for @message do |f| %>

Correct me if I’m wrong, but as far as I know the form_for helper is not
able to deal with nested resources when used in the super compact
fashion above. You’re right, Rails knows that it is dealing with a new
object; however it tries to use message_path instead of
user_messages_path(@user) to create the url. This format should work:

<% form_for :messages, @message,
:url => user_messages_path(@user) do |f| %>

Cheers,
Jan

3

… that should have read “messages_path instead of user_messages_path”

4

On Apr 22, 10:20 pm, Jan F. [email protected]
wrote:

<% form_for :messages, @message,
:url => user_messages_path(@user) do |f| %>

form_for [@user, @message] do

  • Hendrik
5

Hendrik M. wrote:

On Apr 22, 10:20�pm, Jan F. [email protected]
wrote:

� <% form_for :messages, @message,
� � � � � � � :url => user_messages_path(@user) do |f| %>

form_for [@user, @message] do

Nice! Thanks Hendrik.

6

Very cool, thanks a lot guys!