Rails：没有路线匹配...缺少必需的键：[：id] [英] Rails: No route matches ... missing required keys: [:id]

问题描述

完全错误：

No route matches {:id=>#<Reminder id: nil, medication: nil, time: nil, created_at: nil, updated_at: nil, user_id: 1>} missing required keys: [:id]

这是导致错误的index.html.erb中的代码：

Here is the code from index.html.erb that is causing the error:

<tbody>
    <% @reminders.each do |reminder| %>
      <tr <%= dom_id(reminder) %>>
        <td><%= reminder.medication %></td>
        <td><%= reminder.time %></td>
        <td>
          <%= link_to "Edit", edit_reminder_path(reminder) %>
          or
          <%= link_to 'Remove', reminder, method: :delete, data: { confirm: 'Are you sure?' } %>
      </td>
      </tr>
    <% end %>
  </tbody>

型号：

class Reminder < ActiveRecord::Base
    validates :medication, presence: true
    belongs_to :user
end
class User < ActiveRecord::Base
  has_many :reminders
end

操作：

  def index
    @reminders = current_user.reminders
    @reminder = current_user.reminders.new 
  end
  def edit
  end

路线：

Medy::Application.routes.draw do
  devise_for :users
  resources :reminders
  root 'reminders#index'
end

是否需要在编辑操作中添加一些内容才能使这项工作正常？

Do I need to add something to the edit action to make this work?

我将 @ reminders = Reminders.all 更改为 @ reminders = current_user之后，错误开始发生.reminders 在索引操作中。

The error started happening after I changed @reminders = Reminders.all to @reminders = current_user.reminders in the index action.

推荐答案

原因是您传递的是未保存的实例提醒到edit_reminder_path。当您将实例作为参数传递给路由时，将在该实例上调用 to_param方法。默认情况下， to_param方法返回实例的 id。

The reason for this is that you are passing an unsaved instanced of 'reminder' into the edit_reminder_path. When you pass an instance as a parameter to a route the 'to_param' method is called on that instance. By default the 'to_param' method returns the 'id' of the instance.

在您的情况下，您具有：

In your case you have:

def index
  @reminders = current_user.reminders
  @reminder = current_user.reminders.new
end

因为您已将@reminder的作用域设置为当前用户。该实例将添加到该用户的提醒集合中，因此也包含在@reminders中。这意味着当您在索引页面上呈现@reminders时，它还将尝试呈现尚未设置'id'的未保存的@reminder。

Because you have scoped the @reminder to the current user. That instance is added to the collection of reminders for that user, and so is also included in @reminders. This means that when you are rendering out the @reminders on the index page, It also tries to render out the unsaved @reminder which has not yet got an 'id' set.

一个更好的解决方案是将索引操作更改为：

A better solution would be to change you index action to:

def index
  @reminders = current_user.reminders
  @reminder = Reminder.new
end

您可以保存提醒，很可能是在创建操作中，将范围设置为current_user：

And then at the point that you save the reminder, most likely in a 'create' action, you would scope to the current_user:

def create
  @reminder = current_user.reminders.new(reminder_params)
  if @reminder.save .....
end

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