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Ruby

Posted by Malgorzata Dlugosz
Malgorzata Dlugosz
907 Points

Problem with form

Hey I try to create form from scratch .. I can't just make it work.

Controller named : websites_controller Action named : website Model named : website.rb

Now my form ..

<%= simple_form_for @website do |f| %>

f.input :somefield

<% end %>

In my routes I have -> resources :website And -> get '/website', :to => 'websites/website' This is main view, where the form is

I get funny errors like -> undefined model_name for nil Or -> undefined path websites_path

What do I do wrong?

Thanks in advance

Victor Miclovich
Victor Miclovich
9,108 Points

Make sure that in your webites controller (websites_controller.rb) file that you have defined the @website instance; for example

class WebsitesController < ActionController

   # am assuming that you are trying to create a new website
   def new
       @website = Website.new  # set up instance variable
   end

  def create
      @website = Website.create params[:website] 
  end

  ## several other methods left
end

In your routes.rb, you probably have that as your bare mininum

resources :websites
get '/website', to: 'website#website'   # I suppose that in your websites_controller you defined a `website` action

Its wise to keep the method names as RESTful as possible (7 methods: index, new, show, edit, update, and destroy). Following conventions make it easy to debug. I hope the above helps... a nill class or undefined model name signifies not defining the model instance in the fast place to the expecting action/method.

Victor Miclovich
Victor Miclovich
9,108 Points

Quick correction on the controller class, its supposed to subclass ApplicationController, my bad.

class WebsitesController < ApplicationController

   # am assuming that you are trying to create a new website
   def new
       @website = Website.new  # set up instance variable
   end

  def create
      @website = Website.create params[:website] 
  end

  ## several other methods left
end

1 Answer

Malgorzata Dlugosz
Malgorzata Dlugosz
907 Points
Malgorzata Dlugosz
Malgorzata Dlugosz
907 Points

simple_form_for -> @website, does the website instance variable has to be the same name as controllers name or new insance of the controller ->

def website @website = Website.new end

??

Victor Miclovich
Victor Miclovich
9,108 Points

Not really. The instance variable is defined in your controller (websites_controller.rb). However, Rails developers follow certain conventions when it comes to defining routes in your routes.rb.

It is not really wise to make your controllers fat with new methods such as website: for more information, check out: http://guides.rubyonrails.org/layouts_and_rendering.html and http://guides.rubyonrails.org/routing.html (very important links)

If you want your route to pick up the website method in your controller, then you can do this (as mentioned in the previous post):

In your routes.rb

get '/website', to: 'websites#website'

In your websites_controller.rb:

class WebsitesController < ApplicationController
   def website
      @website = Website.new
   end
end

However, I still advise that you follow the RESTful way of working.