Question

所以我通过编写一些简单的应用程序来学习rails，在那个应用程序中我有两种类型的对象：Tasks和Projects.Sense是所有这些对象都可以由用户创建，用户必须能够操作它们等等。每个任务belongs_to项目和项目has_many任务。但是当我创建新项目时 - 它已经包含了所有其他项目的所有任务，所以看起来像：

这＆＃39; 123＆＃39;通过简单地将任务添加到项目＆＃39;创建任务。但是同样的任务仍然出现在另一个项目中。如何修复这个bug并使我的任务与众不同？我认为必须在任务或项目模型中添加一些内容但我不知道应该添加什么。

以下是相应的型号和控制器：

Task.rb

class Task < ActiveRecord::Base
  belongs_to :project
end

Project.rb

class Project < ActiveRecord::Base
  belongs_to :user
  has_many :tasks, dependent: :destroy
  validates :name, presence: true, uniqueness: true
end

tasks_controller.rb

class TasksController < ApplicationController
  before_action :set_task, only: [:show, :edit, :update, :destroy]

  # GET /tasks
  # GET /tasks.json
  def index
    @tasks = Task.all
  end

  # GET /tasks/1
  # GET /tasks/1.json
  def show
  end

  # GET /tasks/new
  def new
    @task = Task.new
  end

  # GET /tasks/1/edit
  def edit
  end

  # POST /tasks
  # POST /tasks.json
  def create
    @task = Task.new(task_params)

    respond_to do |format|
      if @task.save
        format.html { redirect_to home_url }
        format.json { render :show, status: :created, location: @task }
      else
        format.html { render :home_url }
        format.json { render json: @task.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /tasks/1
  # PATCH/PUT /tasks/1.json
  def update
    respond_to do |format|
      if @task.update(task_params)
        format.html { redirect_to home_url }
        format.json { render :home_url, status: :ok, location: @task }
      else
        format.html { render :home_url }
        format.json { render json: @task.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /tasks/1
  # DELETE /tasks/1.json
  def destroy
    @task.destroy
    respond_to do |format|
      format.html { redirect_to home_url }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_task
      @task = Task.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def task_params
      params.require(:task).permit(:deadline, :name)
    end
end

projects_controller.rb

class ProjectsController < ApplicationController
  before_action :set_project, only: [:show, :edit, :update, :destroy]

  # GET /projects
  # GET /projects.json
  def index
    @projects = Project.all
  end

  # GET /projects/1
  # GET /projects/1.json
  def show
  end

  # GET /projects/new
  def new
    @project = Project.new
  end

  # GET /projects/1/edit
  def edit
  end

  # POST /projects
  # POST /projects.json
  def create
    @project = Project.new(project_params)

    respond_to do |format|
      if @project.save
        format.html { redirect_to home_url }
        format.json { render :show, status: :created, location: @project }
      else
        format.html { render :home_url }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /projects/1
  # PATCH/PUT /projects/1.json
  def update
    respond_to do |format|
      if @project.update(project_params)
        format.html { redirect_to home_url }
        format.json { render :show, status: :ok, location: @project }
      else
        format.html { render :home_url }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /projects/1
  # DELETE /projects/1.json
  def destroy
    @project.destroy
    respond_to do |format|
      format.html { redirect_to home_url }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_project
      @project = Project.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def project_params
      params.require(:project).permit(:name)
    end
end

任务视图 -

<% @tasks.each do |task| %>
  <div  class="row task">
    <div class="col-xs-12">
      <div class="col-xs-1 checkbox">
         <%= check_box_tag 'accept' %>
      </div>
      <div class="col-xs-8 taskbody">
        <%= task.name %>
      </div>
    <div class="mini-glyph">
      <div class="col-xs-1">
        <span class="glyphicon glyphicon-arrow-up"></span>
        <span class="glyphicon glyphicon-arrow-down"></span>
      </div>
      <div class="col-xs-1">
        <%= link_to edit_task_path(task) do %>
          <span class="glyphicon glyphicon-pencil"></span>
        <% end %>
      </div>
      <div class="col-xs-1">
        <span><%= link_to " ", task, method: :delete, data: { confirm: 'Are you sure?' }, class:"glyphicon glyphicon-trash" %></span>
      </div>
    </div>
  </div>
</div>
<% end %>

Answer 1

要在创建任务时设置project_id，请在表单中添加以下内容：

<%= f.select :project_id, options_for_select(Project.choices) %>

然后在project.rb

def self.choices
  all_projects = []
  Project.find_each do |project|
    # show the name but save the id
    all_projects << [project.name, project.id]
  end
  all_projects
end

然后更改显示Task.where(project_id: project_id)而不是Task.all的任务，如前两条评论所示。

在rails中创建唯一对象

1 个答案: