Question

首先，我为代码量和我要问的内容道歉。但我拼命地需要帮助。我无论如何都无法理解这个概念。

我有一个基本的CRUD（项目），我试图将另一个CRUD（讨论）嵌套到项目中，以便可以对每个项目进行讨论。现在，我一直试图连续五天这样做。我无法理解我的生活。我已经阅读并研究了所有要阅读和研究的内容。我无法自己解决这个问题。

所以，我开始新鲜了。我已经建立了一个新项目并获得了基础知识，但我不知道从哪里开始。如果有人能花时间给我一步一步的指示，我会非常感激。或者，如果你能够快速完成，甚至可能为我完成我的代码？因为我将不得不做大约5个以上，所以如果我有1个完全完成的我可以参考那将是如此惊人。

projects_controller.rb

class ProjectsController < ApplicationController

  def index
    @projects = Project.all
  end

  def show


  end

  def new
    @projects = Project.new

  end

  def create #no view
    @projects = Project.new(project_params)
    if @projects.save
      redirect_to projects_path, :notice => "Your project was sent!"
    else 
      render "new"
    end
  end

  def edit
    @projects = Project.find(params[:id])
  end

  def update #no view
    @projects = Project.find(params[:id])

    if @projects.update_attributes(project_params)
      redirect_to projects_path, :notice => "Your project has been updated."
    else
      render "edit"
    end
  end

  def destroy #no view
    @projects = Project.find(params[:id])
    @projects.destroy
    redirect_to projects_path, :notice => "Your project has been deleted."
  end

  private
  def project_params
    params.require(:project).permit(:title, :description)
  end


end

discussions_controller.rb

class DiscussionsController < ApplicationController


  def index
    @discussion = Discussion.all
  end

  def show
    @discussions = Discussion.find(params[:id])
    @projects = @discussions.Project.all
  end

  def new
    @discussions = Discussion.new

  end

  def create #no view
    @discussions = Discussion.new(discussion_params)
    if @discussions.save
      redirect_to discussions_path, :notice => "Your discussion was submitted."
    else 
      render "new"
    end
  end

  def edit
    @discussions = Discussion.find(params[:id])
  end

  def update #no view
    @discussions = Discussion.find(params[:id])

    if @discussions.update_attributes(discussion_params)
      redirect_to discussions_path, :notice => "Your discussion has been updated."
    else
      render "edit"
    end
  end

  def destroy #no view
    @discussions = Discussion.find(params[:id])
    @discussions.destroy
    redirect_to discussions_path, :notice => "Your discussions has been deleted."
  end

  private
  def discussion_params
    params.require(:discussion).permit(:title, :description)
  end

end

的routes.rb

Rails.application.routes.draw do

  resources :homes
  resources :projects
  resources :discussions

  root "homes#index"

型号：

discussion.rb

class Discussion < ActiveRecord::Base
  belongs_to :project
end

project.rb

class Project < ActiveRecord::Base
  has_many :discussions
end

迁移：

_create_projects.rb

class CreateProjects < ActiveRecord::Migration
  def change
    create_table :projects do |t|
      t.string :title
      t.text :description
      t.date :due_date

      t.timestamps null: false
    end
  end
end

_create_discussions.rb

class CreateDiscussions < ActiveRecord::Migration
  def change
    create_table :discussions do |t|
      t.string :title
      t.text :description

      t.timestamps null: false
    end
  end
end

_create_nested_discussions

class NestedDiscussion < ActiveRecord::Migration
  def change
    add_column :discussions, :project_id, :integer
  end
end

Answer 1

我注意到的一件事是您不允许在强参数中使用project_id属性。因此，在discussion_controller.rb中的参数中添加:project_id：

private
def discussion_params
  params.require(:discussion).permit(:title, :description, :project_id)
end

Answer 2

您可能希望您的路线如此：

resources :projects do
  resources :discussions
end

Rails：与关联一起奋斗（嵌套注释）

2 个答案: