缺少必需的按键导轨

Question

I'm trying to create a form for task in my app.App has two entities:

• Project belongs_to User
• Task belongs_to Project

But I get this error in my view when I'm trying to create this (pretty basic) form

No route matches {:action=>"index", :controller=>"tasks"} missing required keys: [:project_id]

Here is a part of my view with this form

<div class="glyphicon glyphicon-plus col-xs-1 left_plus" ></div>
        <div class="col-xs-10" >
        <%= form_for [@project, @task],url: project_tasks_path do |f| %>
          <%= f.input :body,class: 'form-control' %>
          <%= f.submit 'Add task', class: 'btn' %>
        <% end %>

And here is the project controller:

class ProjectsController < ApplicationController
  before_action :load_project, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!


  def index
    @projects = current_user.projects unless current_user.nil?
    @task = Task.find_by(params[:project_id])
  end

  def show
    @task = @project.tasks.build
  end

  def new
    @project = current_user.projects.new
  end

  def edit
  end

  def create
    @project = current_user.projects.create(project_params)

    if @project.save
      redirect_to root_path
    else
      render :new
    end
  end

  def update
    if @project.update(project_params)
      redirect_to @project
    else
      render :edit
    end
  end

  def destroy
    @project.destroy
    redirect_to projects_path
  end

  private

  def load_project
    @project = Project.find(params[:id])
  end

  def project_params
    params.require(:project).permit(:name, :user_id)
  end

end

And the tasks controller:

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

  def index
    @tasks = Task.where(project_id: project_id)
  end

  def show
    project = Project.find_by(id: params[:project_id])
    @task = Task.new(project: project)
  end

  def new
    project = Project.find_by(id: params[:project_id])
    @task = Task.new(project: project)
  end


  def edit
    project = Project.find_by(id: params[:project_id])
    @task = Task.new(project: project)
  end

  def references
    respond_to do |format|
      if @task.valid?
        format.html { redirect_to root_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

  def create
    @project = Project.find_by(id: params[:project_id])
    @task = @project.tasks.create(task_params)

    respond_to do |format|
      if @task.valid?
        format.html { redirect_to root_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


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

  def edit
  end

  def destroy
    @task.destroy
    respond_to do |format|
      format.html { redirect_to root_url }
      format.json { head :no_content }
    end
  end

  private
    def set_task
      @task = Task.find(params[:id])
    end

    def task_params
      params.require(:task).permit(:deadline, :body, :project_id)
    end
end

The routes file:

devise_for :users, :controllers => { :omniauth_callbacks => "callbacks" }
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
  root 'projects#index'

  resources :projects do
    resources :tasks
  end

And my routes:

projects#index
                   project_tasks GET      /projects/:project_id/tasks(.:format)          tasks#index
                                 POST     /projects/:project_id/tasks(.:format)          tasks#create
                new_project_task GET      /projects/:project_id/tasks/new(.:format)      tasks#new
               edit_project_task GET      /projects/:project_id/tasks/:id/edit(.:format) tasks#edit
                    project_task GET      /projects/:project_id/tasks/:id(.:format)      tasks#show
                                 PATCH    /projects/:project_id/tasks/:id(.:format)      tasks#update
                                 PUT      /projects/:project_id/tasks/:id(.:format)      tasks#update
                                 DELETE   /projects/:project_id/tasks/:id(.:format)      tasks#destroy
                        projects GET      /projects(.:format)                            projects#index
                                 POST     /projects(.:format)                            projects#create
                     new_project GET      /projects/new(.:format)                        projects#new
                    edit_project GET      /projects/:id/edit(.:format)                   projects#edit
                         project GET      /projects/:id(.:format)                        projects#show
                                 PATCH    /projects/:id(.:format)                        projects#update
                                 PUT      /projects/:id(.:format)                        projects#update
                                 DELETE   /projects/:id(.:format)                        projects#destroy

Can somebody please help me to clarify where is the problem and what is the problem?

Answer 1

The problem is with your TasksController#index action. What is project_id there? For accessing a project's tasks, the project needs to exist in the first place. And not just that. To access any CRUD action on tasks, a project has to exist first.

Modify your TasksController as

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

  def index
    @tasks = @project.tasks
  end

  def show
    #makes use of set_task
  end

  def new
    @task = @project.tasks.new
  end


  def edit
  end

  def references
    respond_to do |format|
      if @task.valid?
        format.html { redirect_to root_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

  def create
    @task = @project.tasks.create(task_params)
    respond_to do |format|
      if @task.valid?
        format.html { redirect_to root_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


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


  def destroy
    @task.destroy
    respond_to do |format|
      format.html { redirect_to root_url }
      format.json { head :no_content }
    end
  end

  private

  def set_project
    @project = current_user.projects.find(params[:project_id]
  end

  def set_task
    @task = @project.tasks.find(params[:id])
  end

  def task_params
    params.require(:task).permit(:deadline, :body, :project_id)
  end
end

Since we have defined a before_action set_project, @project will be available to all methods. Note that set_project finds the project from the projects created by the current user.

In the ProjectsController#index, you won't actually get a value for params[:project_id] . Modify your index action to

def index
@projects = current_user.projects unless current_user.nil?
end

And I don't understand your show method. The build method is actually used to create a in-memory representation of an object. The show method of projects_controller can be used to display the project along with its tasks. If this is what you need, change you show action in ProjectsController to

def show
  #@project is available from load_project
  @tasks = @project.tasks
end

You could also modify your load_project project as

def load_project
  begin
    @project = Project.find(params[:id]) #raises an exception if project not found        
  rescue ActiveRecord::RecordNotFound
    redirect_to projects_path
  end
end

To know more about rescuing exceptions, see Begin, Rescue and Ensure in Ruby?

For more, see http://blog.8thcolor.com/en/2011/08/nested-resources-with-independent-views-in-ruby-on-rails/

Answer 2

The problem is with the url for submitting the form. If you check your rake routes you'd see that all your task routes would be nested under projects, therefore in passing the url option, you should have something like:

   <div class="glyphicon glyphicon-plus col-xs-1 left_plus" ></div>
    <div class="col-xs-10" >
    <%= form_for [@project, @task],url: project_tasks_path(@project) do |f| %>
      <%= f.input :body,class: 'form-control' %>
      <%= f.submit 'Add task', class: 'btn' %>
    <% end %>

or even better, I think you should be able to do that without passing the url option:

    <div class="glyphicon glyphicon-plus col-xs-1 left_plus" ></div>
     <div class="col-xs-10" >
     <%= form_for [@project, @task] do |f| %>
      <%= f.input :body,class: 'form-control' %>
      <%= f.submit 'Add task', class: 'btn' %>
    <% end %>

UPDATE

def index
  project = Project.find(params[:project_id])
  @projects = ProjectsViewPresenter.new(project)
end

# presenters/projects_view_presenter.rb
class ProjectsViewPresenter
  attr_reader :project
  def initialize(project)
    @project = project
  end

  def tasks
   @tasks ||= project.tasks
  end

  def task
   @task ||= tasks.new
  end
end

Your form_for would now be like this:

   <div class="glyphicon glyphicon-plus col-xs-1 left_plus" ></div>
    <div class="col-xs-10" >
    <%= form_for [@project.project, @project.task] do |f| %>
      <%= f.input :body,class: 'form-control' %>
      <%= f.submit 'Add task', class: 'btn' %>
    <% end %>

Answer 3

If the form to create a new task is in projects/index.html.erb you should make a @task variable available to the view; try to change the index action as follow:

def index
  @projects = current_user.projects unless current_user.nil?
  @task = Task.new
end