[noob question] View error, Resource route

rubyonrails-talk
1

Hello everyone,

I have a little problem, since I have change my route from resources to resource. My files look like:

# config/routes.rb ActionController::Routing::Routes.draw do |map|   map.resource :system end

# app/controllers/systems_controller.rb class SystemsController < ApplicationController   def new     @system = System.new   end end

# app/views/systems/new.html.erb <% form_for @system do |f| %> <%= f.error_messages %>

And here is my error message:

NoMethodError in Systems#new

Showing app/views/systems/new.html.erb where line #1 raised:

undefined method `systems_path' for #<ActionView::Base:0x3459fe0> Extracted source (around line #1):

1: <% form_for @system do |f| %> 2: <%= f.error_messages %> 3: 4: <dl> RAILS_ROOT: /Users/pulu/Sites/test

Do you think I get an error in new.html.erb?

Thanks

2

try... <% form_tag system_path do %>

using @system is a shortcut way of writing systems_path but it looks for the plural path - you've set yours to a singular resource path

run "rake routes" to see your available paths in the terminal window.

Hope that helps

3

Gavin Morrice wrote:

try... <% form_tag system_path do %>

Thanks, Gavin. When I do this, I get an error at the line 2 about: <%= f.error_messages %>

To solve it, I had just rewrite this line with: <%= error_messages %>

But an other error message is occuring, saying that "error_messages" is not defined (if I remember well).

4

Sorry - should have explained:

If you use the form_tag method then you can't pass a variable like |f|

you'd have to replace things like f.text_field :your_field

with

text_field :system, :your_field

and use the error_messages_for method instead: http://api.rubyonrails.org/classes/ActionView/Helpers/ActiveRecordHelper.html#M001662

I think you can use form_for as you did before but write it like:

<% form_for :system, :url => {:action => :create} do |f| %>

This would be the easiest option but I'm not 100% sure if that works with a singular resource.

Would be curious to find out if it does?

5

Many thanks, Gavin Morrice.

Thanks to your answer, I had making some modifications to gets this:

<% form_tag system_path do %> <%= error_messages_for 'system' %> ... <%= submit_tag 'Create' %> <% end %>

After testing this line: <% form_for :system, :url => {:action => :create} do |f| %>

it's okay too.