驗證每個用戶每個課程的唯一性記錄// Rails 4

問題：我希望每個用戶只有每位用戶1個UserLesson 因爲我正在構建一個跟蹤系統（進度系統）用戶應該能夠看到多少教訓剩餘課/總教訓，也標記爲已完成應添加的CSS驗證每個用戶每個課程的唯一性記錄// Rails 4

我從視圖的數據發送到所述控制器時：

<%= link_to 'Mark as completed', user_lessons_path(@user_lesson, user_lesson: {user_id: current_user.id, lesson_id: @lesson.id}), :method => :post, class: 'btn btn-primary-big' %>

控制器接收數據，並且啓動創建方法

class UserLessonsController < ApplicationController 
    before_filter :set_user_and_lesson 

    def show 
    end 

    def create 
    @user_lesson = UserLesson.create(user_lesson_params) 
    if @user_lesson.save 
     flash[:success] = "You rock! Keep up ;)" 
     redirect_to(:back) 
    else 
    flash[:success] = "You have already completed this lesson" 
    redirect_to(:back) 
    end 
end 

    private 

    def user_lesson_params 
     params.require(:user_lesson).permit(:user_id, :lesson_id, :completed) 
end 
end

這裏是模型關係

class UserLesson < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :lesson 
    # validates_uniqueness_of :user_lesson, :scope => [:user, :lesson] 
    end 

class Lesson < ActiveRecord::Base 
    has_one :lecture, through: :chapter 
    belongs_to :chapter 
end 

class User < ActiveRecord::Base 
    has_many :enrollments 
    has_many :user_lessons 
    has_many :lectures, through: :enrollments 
    accepts_nested_attributes_for :enrollments 
end 

class Enrollment < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :lecture 
    validates :lecture, uniqueness: { scope: :user, message: "should happen once per user" } 
end 

class Lecture < ActiveRecord::Base 
    belongs_to :category 
    has_many :lessons, through: :chapters, dependent: :destroy 
    has_many :chapters 
    belongs_to :teacher 

    # For course user relationship 
    has_many :enrollments 
    has_many :users, through: :enrollments 

    accepts_nested_attributes_for :enrollments 
    accepts_nested_attributes_for :chapters 
end 

class Chapter < ActiveRecord::Base 
    has_many :lessons 
    belongs_to :lecture 
    accepts_nested_attributes_for :lessons 
end

我的猜測是，驗證每個用戶和教訓的用戶課的獨特性。但似乎無法工作得到了錯誤信息。

來源

2015-08-24 AdrienNhm

什麼是錯誤訊息？ – usmanali

控制器 – AdrienNhm

中未定義的user_lesson可以粘貼整行嗎？ – usmanali

此驗證添加到您的模型，以確保用戶範圍的獨特性：

validates :lesson_id, :uniqueness => {:scope=>:user_id}

來源

2015-08-25 14:33:55 AdrienNhm

驗證每個用戶每個課程的唯一性記錄// Rails 4

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