RoR:标记一个完整的对象，将completed_on保存在其他模型中

Question

我正在创建一个操作，用户可以将作业标记为完整。

作业主要存储在作业表中，但homework_student保存completed_on和布尔完整属性：

homework_student.rb

 id             :integer          not null, primary key
    #  school_user_id :integer          not null
    #  homework_id    :integer          not null
    #  completed_on   :datetime
    #  created_at     :datetime         not null
    #  updated_at     :datetime         not null
    #  complete       :boolean

belongs_to :homework, :class_name => 'Homework', :foreign_key => :homework_id, dependent: :destroy

homework.rb

 has_many :homework_students, :class_name => 'HomeworkStudent', dependent: :destroy

我的尝试。

在我的作业显示视图中，我希望用户能够单击“完成作业”，并将日期存储在completed_on属性中的homework_students中。

路线：

 resources :homeworks do 
    resources :homework_students do
    member do
      patch :complete
    end
  end
end

homeworks_controller.rb：

def complete
        @complete_item = Homework.homework_students.update_attribute(:completed_on, Time.now)
    end

我认为：

<% @homework.homework_students.each do |homework_student| %> 
          <%= link_to "complete", complete_homework_path(:homework_id => @homework, :home_work_students_id => homework_student), method: :patch %> 
          <% end %>

我正在尝试一种补丁方法，但它不起作用。我不确定为此使用布尔属性是否更好，但我不确定如何使用。家庭作业有很多用户，每个用户都会更新，不管他们是否已经完成。

错误：

undefined local variable or method `homework

非常感谢你的指导。

更新: homeworks_controller.rb

        before_action :find_homework, only: [:show, :complete, :edit, :update]
                    #before_action :set_homework, only: [:show]
                    #before_action :set_homework_student, except: [:create]
                    before_action :authenticate_user!

            ....
    def complete
        # Loop over each matching homework_student for the @homework where the id matches and update the completed_on attribute.
        # You need to get the indivual homework_student record and update it. You could do it other ways but this seemed to work for me.
        @homework.homework_students.where(id: params[:home_work_students_id]).each do |homework_student| homework_students.update_attributes(:completed_on => Time.now)
        end
        # Redirect back to the @homework view.
        redirect_to @homework, notice: 'Homework was successfully marked as complete.'        
      end
            ....

          private

                def set_homework_student
                    @homework_students =    HomeworkStudent.find(params[:homework_id])
                end

                def set_homework
                  @homework = @homework_students.homeworks.find(params[:id])
                end


                def homework_params
                    params.require(:homework).permit(:user_id, :id, :school_user_id, :homeworks, :significance, :significance_id, :sig_option, :feedback_request, :subject, :source, :description, :due, :completed_at, homework_students: [:completed_on, :complete], school_user: [:f_name, :s_name])
                end



def find_homework
            @homework = Homework.find(params[:id])
        end
end

更新错误：

Error message:

undefined method `update_attributes' for nil:NilClass

Rails.root: 

Application Trace | Framework Trace | Full Trace
app/controllers/homeworks_controller.rb:39:in `block in complete'
app/controllers/homeworks_controller.rb:39:in `complete'
Request

Parameters:

{"_method"=>"patch",
 "authenticity_token"=>"OL1vW0BnnJ8TM5lshZWNKisNMrTU2Gp2cY7jYf3T+NRhlx2994q0ndrpehz+vW5unY1EBtSKCHecOJjTDwLHsw==",
 "home_work_students_id"=>"142",
 "homework_id"=>"78",
 "id"=>"78"}

视图更新

 <% @homework.homework_students.each do |homework_student| %>
              <%= link_to "complete", complete_homework_path(@homework, homework_student), method: :patch %> 
              <% end %>

Answer 1

我根据我们的评论来嘲弄这个版本，虽然它可能不是最好的方法，但它在我的端起作用了。您可能希望看到使用ajax在他的todo应用程序上进行这种更新的这是Mackenzie Child的视频 (将事情标记为完整，等等)。

在你的routes.rb里

resources :homeworks do 
    member do
      patch :complete
    end
    resources :homework_students
end

在你的homework_controller.rb里

 def complete
    # Loop over each matching homework_student for the @homework where the id matches and update the completed_on attribute.
    # You need to get the indivual homework_student record and update it. You could do it other ways but this seemed to work for me.
    @homework.homework_students.where(id: params[:home_work_students_id]).each do |homework_student|
      homework_student.update_attributes(:completed_on => Time.now)
    end
    # Redirect back to the @homework view.
    redirect_to @homework, notice: 'Homework was successfully marked as complete.'        
  end

before_action :set_homework, only: [:show, :complete]

在你的作业中show.html.erb

# This assumes you are looping over the @homework.homework_students in your view to create a link for each homework_student record and that will give you access to the homework_student local variable.
<%= link_to "complete", complete_homework_path(:homework_id => @homework, :home_work_students_id => homework_student), method: :patch %>