NoMethodError在CarController＃添加未定義的方法`USER_ID =」爲＃<汽車：0x71451d8>

Question

NoMethodError in CarController#add 

undefined method `user_id=' for #<Car:0x7160c70> 
RAILS_ROOT: C:/Users/Jatinder/BitNami RubyStack projects/mercedes_mod 2 
add.html (for adding car) 

add.html在/視圖/汽車

<h1>Ask a Question or Discuss Your Car</h1> 
<%= error_messages_for :car %> 
<br> 
<p>You can ask anything related to cars even if its not a Mercedes!</p> 
<% form_for :car do |f| %> 

    <p> 
    <%= f.label :name, "Title of Question" %> 
    <%= f.text_field :name %> 
    </p> 
    <p> 
    <%= f.label :description, "Describe Your Question" %> 
    <%= f.text_area :description %> 
    </p> 
    <p> 
    <%= f.submit "Add" %> 
    </p> 
<% end %> 

在car_controller.rb DEF添加：

def add 
     @title = "Ask a New Question" 
    if request.post? 
     @car = Car.new(params[:car]) 
     @car.user_id = User.logged_in(session).id 
    if @car.save 
     flash[:notice] = "Car #{@car.name} added!" 
     redirect_to :controller => :car, :action => :index 
     end 
    end 
    end 

car.rb型號：

class Car < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :subject 
    validates_presence_of :name, :description 
end 

的routes.rb

個

map.connect ':controller/:action/:id' 
    map.connect ':controller/:action/:id.:format' 
    map.resources :car, :users => { :delete => :get } 
    map.root :controller => "main" 
    map.root :controller => "car", :action => "destroy" 
end 

create_cars遷移：

class CreateCars < ActiveRecord::Migration 
    def self.up 
    create_table :cars do |t| 
     t.interger :user_id 
     t.string :name 
     t.string :description 

     t.timestamps 
    end 
    end 

    def self.down 
    drop_table :cars 
    end 
end 

Answer 1

您的遷移有一個錯字。 ，而不是t.interger您的:user_id。此外，請確保在運行您的應用程序之前在您的控制檯中運行rake db:migrate。

Answer 2

你的遷移破獲：

t.interger :user_id 

你正在尋找一個整數。