Ruby on rails 控制器#创建中缺少参数
当一个用户可以预订一个训练小时时,我正在尝试制作一个应用程序。 当我尝试创建这本书时,我收到了以下方法: ActionController::BookingsController中的参数缺失#创建 缺少参数或值为空:booking 这是我的预订管理员:Ruby on rails 控制器#创建中缺少参数,ruby-on-rails,model-view-controller,restful-architecture,Ruby On Rails,Model View Controller,Restful Architecture,当一个用户可以预订一个训练小时时,我正在尝试制作一个应用程序。 当我尝试创建这本书时,我收到了以下方法: ActionController::BookingsController中的参数缺失#创建 缺少参数或值为空:booking 这是我的预订管理员: class BookingsController < ApplicationController before_action :load_training, only: [:create] def new @bookin
class BookingsController < ApplicationController
before_action :load_training, only: [:create]
def new
@booking = Booking.new
end
def create
@booking = @training.bookings.build(booking_params)
@booking.user = current_user
if @booking.save
flash[:success] = "Book created"
redirect_to training_index_url
else
render 'new'
end
end
def index
@booking = Booking.all
end
def destroy
@booking = Booking.find(params[:id])
@booking.destroy
flash[:success] = "Book deleted"
redirect_to training_index_url
end
private
def booking_params
params.require(:booking).permit(:user_id, :training_id)
end
def load_training
@training = Training.find_by(params[:training_id])
end
end
新预订视图:
<h1>Booking confirmation</h1>
<%= form_for (@booking) do |f| %>
<%= f.submit "Book", class: "btn btn-primary" %>
<% end %>
谢谢代码的问题在于您没有从预订视图发送
用户id
和培训id
您应该有user\u id
,它可以是一个隐藏字段,对于用户选择的培训,您应该有training\u id
<%= f.hidden_field :user_id, value: current_user.id %>
如果用户一次可以预订多个培训,则可以使用“多选”选项创建培训列表
It用户在一个事务中只能预订一个培训,每个培训对应的复选框应该可以做到这一点
<ul>
<% @trainings.each do |training| %>
<li>
<%= check_box_tag 'training_ids[]', training.id -%>
<%= h training.name -%>
</li>
<% end %>
</ul>
-
当用户提交此文件时,您将获得
user\u id
以及training\u id
作为training\u id=[“1”、“2”、“3”]
您能在终端中发布发布发布期间发送的内容吗。您好,欢迎来到Stack Overflow。。。因此,在您的表单/视图中,我没有看到user\u id
或training\u id
的字段。你忘了包括它们了吗?我应该如何添加培训id?好吧,我有点困惑,我要让用户每天只能有一个预约,我必须把迭代@training对象的代码放在哪里?训练索引?它给了我一个错误:未定义nil:NilClass的方法'each'
Started POST "/bookings" for 127.0.0.1 at 2017-03-09 00:31:53 -0400
Processing by BookingsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"EUoo8M66O2XlRgeMoEsSqwH2i/EKKFzMMRsY9UilzcU+T+5n6/Gjx0abxlZ7nJlqgr5wsALtXW/UMf2Q01pNUg==", "commit"=>"Reservar"}
Training Load (0.1ms) SELECT "trainings".* FROM "trainings" LIMIT ? [["LIMIT", 1]]
Completed 400 Bad Request in 2ms (ActiveRecord: 0.1ms)
ActionController::ParameterMissing (param is missing or the value is empty: booking):
app/controllers/bookings_controller.rb:36:in `booking_params'
app/controllers/bookings_controller.rb:9:in `create'
Rendering /home/cesar/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb wi
<%= f.hidden_field :user_id, value: current_user.id %>
<ul>
<% @trainings.each do |training| %>
<li>
<%= check_box_tag 'training_ids[]', training.id -%>
<%= h training.name -%>
</li>
<% end %>
</ul>