Ruby on rails Rails 4:ActionController::UrlGenerationError
我有三种型号:Ruby on rails Rails 4:ActionController::UrlGenerationError,ruby-on-rails,ruby-on-rails-4,has-many-through,nested-resources,nested-routes,Ruby On Rails,Ruby On Rails 4,Has Many Through,Nested Resources,Nested Routes,我有三种型号: class User < ActiveRecord::Base has_many :administrations has_many :calendars, through: :administrations end class Calendar < ActiveRecord::Base has_many :administrations has_many :users, through: :administrations end class Ad
class User < ActiveRecord::Base
has_many :administrations
has_many :calendars, through: :administrations
end
class Calendar < ActiveRecord::Base
has_many :administrations
has_many :users, through: :administrations
end
class Administration < ActiveRecord::Base
belongs_to :user
belongs_to :calendar
end
-----------
更新:
以下是我在终端中运行rake routes
时得到的结果:
Prefix Verb URI Pattern Controller#Action
user_administrations GET /users/:user_id/administrations(.:format) administrations#index
POST /users/:user_id/administrations(.:format) administrations#create
new_user_administration GET /users/:user_id/administrations/new(.:format) administrations#new
edit_user_administration GET /users/:user_id/administrations/:id/edit(.:format) administrations#edit
user_administration GET /users/:user_id/administrations/:id(.:format) administrations#show
PATCH /users/:user_id/administrations/:id(.:format) administrations#update
PUT /users/:user_id/administrations/:id(.:format) administrations#update
DELETE /users/:user_id/administrations/:id(.:format) administrations#destroy
user_calendars GET /users/:user_id/calendars(.:format) calendars#index
POST /users/:user_id/calendars(.:format) calendars#create
new_user_calendar GET /users/:user_id/calendars/new(.:format) calendars#new
edit_user_calendar GET /users/:user_id/calendars/:id/edit(.:format) calendars#edit
user_calendar GET /users/:user_id/calendars/:id(.:format) calendars#show
PATCH /users/:user_id/calendars/:id(.:format) calendars#update
PUT /users/:user_id/calendars/:id(.:format) calendars#update
DELETE /users/:user_id/calendars/:id(.:format) calendars#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
root GET / static_pages#home
-----------
更新2:
这是我的日历\u controller.rb
文件:
class CalendarsController < ApplicationController
before_action :set_calendar, only: [:show, :edit, :update, :destroy]
# GET /calendars
# GET /calendars.json
def index
@calendars = Calendar.all
end
# GET /calendars/1
# GET /calendars/1.json
def show
end
# GET /calendars/new
def new
@user = User.find(params[:user_id])
@calendar = @user.calendars.new
end
# GET /calendars/1/edit
def edit
@user = User.find(params[:user_id])
@calendar = @user.calendar.find(params[:calendar_id])
end
# POST /calendars
# POST /calendars.json
def create
@user = User.find(params[:user_id])
@calendar = @user.calendars.new(calendar_params)
respond_to do |format|
if @calendar.save
format.html { redirect_to user_calendar_path(@user,@calendar), notice: 'Calendar was successfully created.' }
format.json { render :show, status: :created, location: @calendar }
else
format.html { render :new }
format.json { render json: @calendar.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /calendars/1
# PATCH/PUT /calendars/1.json
def update
respond_to do |format|
if @calendar.update(calendar_params)
format.html { redirect_to @calendar, notice: 'Calendar was successfully updated.' }
format.json { render :show, status: :ok, location: @calendar }
else
format.html { render :edit }
format.json { render json: @calendar.errors, status: :unprocessable_entity }
end
end
end
# DELETE /calendars/1
# DELETE /calendars/1.json
def destroy
@calendar.destroy
respond_to do |format|
format.html { redirect_to calendars_url, notice: 'Calendar was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_calendar
@calendar = Calendar.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def calendar_params
params.require(:calendar).permit(:name)
end
end
特别是,我不理解缺少的必需键:[:id,:user\u id]
部分,因为我的用户日历路径中既有@user
又有@calendar
显然,我遗漏了一些东西,但我不知道是什么
有什么想法吗?您还没有在日历#show
方法中设置@user
和@calendar
。new
操作可以很好地呈现您的视图,但它不知道如何填充参数voor@user
和@calendar
这里的问题是,您正在点击http://localhost:3000/users/1/calendars
url,它映射到您的日历#索引
操作,正确的路径是:user\u calendars\u path
,它只需要一个参数user\u id
,因为它会将您带到用户的索引页面,并显示来自数据库
但是,在index.html.erb
视图中,您有以下内容:
<td><%= link_to 'Edit', edit_user_calendar_path(@user, @calendar) %></td>
因为它被映射到日历#show
操作,并且相应的视图应该是show.html.erb
,但目前它位于index.html.erb
中
回答最后一个问题:
特别是,我不理解缺少的必需键:[:id,
:user_id]part,因为我的
用户\日历\路径
是的,您在控制器中定义了@user
和@calendar
,但在show
方法和user\u calendar\u路径
映射到该日历#show
方法。但是嘿!您正在通过index.html.erb
调用此函数,该函数对应于calendars#index
操作。这就是你所缺少的。希望现在一切都清楚了:-)
最后,差别很微妙
user\u calendars\u path
用于index
视图,该视图显示特定用户的所有日历。在这种情况下,必须在控制器的索引
操作中设置@user
user\u calendar\u path
用于show
,它会将您带到特定用户的特定日历。在这种情况下,您必须在控制器的show
方法中设置@user
和@calendar
。post calendars\u controller code请确认您的回复。我刚刚将@user=user.find(params[:user_id])@calendar=@user.calendars.find(params[:calendar_id])
添加到calendars#show
中,但问题和错误仍然存在。此代码有问题吗?非常感谢您的详细回答。我应该如何更新我的日历\u controller
来解决这个问题?如果您从index.html.erb
中删除:``则它基本上可以工作,这取决于您想要完成什么。您不能在index.html.erb
中使用user\u calendar\u path
如果您告诉我您想在index
视图中显示,那么我可以告诉您要更改什么。什么是可能的,什么不是。请澄清你的目标。好吧,你没有!这就是show
页面的工作,您需要在show.html.erb
ActionController::UrlGenerationError in Calendars#index
Showing /Users/TXC/code/rails/calendy/app/views/calendars/index.html.erb where line #17 raised:
No route matches {:action=>"show", :controller=>"calendars", :id=>nil, :user_id=>nil} missing required keys: [:id, :user_id]
Extracted source (around line #17):
<tr>
<td><%= calendar.name %></td>
<td><%= link_to 'Show', user_calendar_path(@user, @calendar) %></td>
<td><%= link_to 'Edit', edit_user_calendar_path(@user, @calendar) %></td>
<td><%= link_to 'Destroy', calendar, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<td><%= link_to 'Edit', edit_user_calendar_path(@user, @calendar) %></td>
<td><%= link_to 'Show', user_calendar_path(@user, @calendar) %></td>