ruby on rails - undefined local variable or method `city' ROR -

i created form using scaffold , creating models make nested model error in browser , cannot solve , looking here, getting error :

    nameerror in clients#new      line #33 raised:  undefined local variable or method `city' #<#<class:0xc4fb5bc>:0xb704f94>  extracted source (around line #33):  30:     <% end %> 31:   </div> 32:   <div class="field"> 33:     <%= city.fields_for :street |street| %> 34:     <%= street.label :street %> 35:     <%= street.text_field :name %> 36:     <% end %> 

client.rb

class client < activerecord::base   attr_accessible :email, :name   has_one :city   accepts_nested_attributes_for :city end 

city.rb

class city < activerecord::base   attr_accessible :client_id, :name   belongs_to :client   has_many :streets   accepts_nested_attributes_for :streets end 

street.rb

class street < activerecord::base   attr_accessible :city_id, :name   belongs_to :city end 

clients_controller.rb [ generated scaffold ]

def new     @client = client.new     @city = @client.build_city     @street = @city.build_street # don't know should add line or not      respond_to |format|       format.html # new.html.erb       format.json { render json: @client }     end    end 

the form

<%= form_for(@client) |f| %>   <% if @client.errors.any? %>     <div id="error_explanation">       <h2><%= pluralize(@client.errors.count, "error") %> prohibited client being saved:</h2>        <ul>       <% @client.errors.full_messages.each |msg| %>         <li><%= msg %></li>       <% end %>       </ul>     </div>   <% end %>    <div class="field">     <%= f.label :name %><br />     <%= f.text_field :name %>   </div>   <div class="field">     <%= f.label :email %><br />     <%= f.text_field :email %>   </div>   <div class="field">     <%= f.fields_for :city |city| %>     <%= city.label :city %>     <%= city.text_field :name %>          <%= city.fields_for :street |street| %>     <%= street.label :street %>     <%= street.text_field :name %>     <% end %>     <% end %>   </div>   <div class="field">    </div>    <div class="actions">     <%= f.submit "submit client", class: "btn btn-large btn-primary" %>   </div> <% end %> 

routes.rb

 resources :clients     resources :cities       resources :streets     end   end 

you have change model:

class city < activerecord::base   attr_accessible :client_id, :name   belongs_to :client   has_many :streets   accepts_nested_attributes_for :streets # add "s"! end 

and have modify _form.html.erb

<%= city.fields_for :streets |street| %>  ## add "s"   <%= street.label :street %>   <%= street.text_field :name %> <% end %> 

and have modify controller mind.blank said in answer.

btw maybe in general understand accepts_nested_attributes_for bit better..

• http://railscasts.com/episodes/196-nested-model-form-part-1
• http://railscasts.com/episodes/197-nested-model-form-part-2
• http://railscasts.com/episodes/196-nested-model-form-revised