has_and_belongs_to_many关联和未定义的方法

我在我的rails应用程序中使用devise进行身份验证，并在我的一个控制器中使用'current_user'方法。从那以后，我在用户和活动表格之间建立了一个'has_and_belongs_to_many'关联，如下所示。has_and_belongs_to_many关联和未定义的方法

我的问题是，我得到以下错误，当新/ create方法被调用我的活动控制器：

'undefined method `user_id' for #<Activity:0x007fe89c4e8400>'

任何人有什么这是由引起的线索？谢谢！

activities_controller.rb

def create 
    @activity = Activity.new(params[:activity]) 

    respond_to do |format| 
     if @activity.save 
     format.html { redirect_to @activity, notice: 'Activity was successfully created.' } 
     format.json { render json: @activity, status: :created, location: @activity } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @activity.errors, status: :unprocessable_entity } 
     end 
    end 
    end

user.rb

class User < ActiveRecord::Base 
    # Include default devise modules. Others available are: 
    # :token_authenticatable, :confirmable, 
    # :lockable, :timeoutable and :omniauthable 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable 

    # Setup accessible (or protected) attributes for your model 
    attr_accessible :email, :password, :password_confirmation, :remember_me, :name 

    # attr_accessible :title, :body 

    #many to many association 
    has_and_belongs_to_many :activities 
end

activity.rb

class Activity < ActiveRecord::Base 
    attr_accessible :description, :image 


    validates :description, presence: true 
    validates :user_id, presence: true 
    validates_attachment :image, presence: true, 
         content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/gif', 'image/png']}, 
         size: { less_than: 5.megabytes } 
    has_and_belongs_to_many :user 
    has_attached_file :image, styles: { small: "240x180"} 

end

schema.rb

ActiveRecord::Schema.define(:version => 20130630004839) do 

    create_table "activities", :force => true do |t| 
    t.string "description" 
    t.datetime "created_at",   :null => false 
    t.datetime "updated_at",   :null => false 
    t.string "image_file_name" 
    t.string "image_content_type" 
    t.integer "image_file_size" 
    t.datetime "image_updated_at" 
    end 

    create_table "activities_users", :id => false, :force => true do |t| 
    t.integer "activity_id" 
    t.integer "user_id" 
    t.datetime "created_at", :null => false 
    t.datetime "updated_at", :null => false 
    end 

    create_table "users", :force => true do |t| 
    t.string "email",     :default => "", :null => false 
    t.string "encrypted_password",  :default => "", :null => false 
    t.string "reset_password_token" 
    t.datetime "reset_password_sent_at" 
    t.datetime "remember_created_at" 
    t.integer "sign_in_count",   :default => 0 
    t.datetime "current_sign_in_at" 
    t.datetime "last_sign_in_at" 
    t.string "current_sign_in_ip" 
    t.string "last_sign_in_ip" 
    t.datetime "created_at",        :null => false 
    t.datetime "updated_at",        :null => false 
    t.string "name" 
    end 

    add_index "users", ["email"], :name => "index_users_on_email", :unique => true 
    add_index "users", ["reset_password_token"], :name => "index_users_on_reset_password_token", :unique => true 

end

来源

2013-06-30 garys

你必须这样做：

@activity = current_user.activities.build(params[:activity])

来源

2013-06-30 07:50:14 sunny1304

has_and_belongs_to_many关联和未定义的方法

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