Rails - "Cannot find object with 'id'="

Question

希望有人能帮我解决这个问题。我正在创建一个 nested_form_for Order.new，fields_for 日期Order.new。

在我的orders_controller中，我在'new'和'create'动作中定义了@school，这对order/new和order/show都很重要。然而，Rails 似乎没有找到符合参数的学校。

提交表单时出错：ActiveRecord::RecordNotFound in OrdersController#create

（找不到 'id'= 的学校）

参数："order"=>{"user_id"=>"2", "school_id"=>"1", ... } <-- 对我来说很好，:school_id = 1.

Routes.rb

get '/schools/:school_id/orders/new' => 'orders#new'

resources :schools do
  resources :orders
end
resources :orders

Orders_controller.rb

def new
    @order = Order.new
    @order.date_orders.build
    @school = School.find(params[:school_id])
end

def create
    @school = School.find(params[:school_id])
    @order = Order.new(order_params)
    if @order.save
        flash[:success] = "Thank you for your request. We will get in touch with you shortly."
        render @order
    else
        render 'new'
    end
end

def show
    @order = Order.find(params[:id])
    @user = current_user
    if current_user && current_user.school_manager
      @school = School.find(SchoolAdmin.find_by(user_id: current_user.id).school_id)
    elsif current_user && current_user.district_manager
      @district = District.find(DistrictAdmin.find_by(user_id: current_user.id).district_id)
    end
end

Orders/new.html.erb

<%= nested_form_for @order do |f| %>

  <%= f.hidden_field :user_id, :value => current_user.id %>
  <%= f.hidden_field :school_id, :value => params[:school_id] %>
  # SOME MORE FIELDS #
  <%= f.fields_for :date_orders do |builder| %>
    # SOME FIELDS_FOR #
  <% end %>

<% end %>

这是我的日志：

    Started POST "/orders" for 174.116.225.174 at 2016-05-06 18:53:52 +0000
Processing by OrdersController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"X2mZC7JqEPdygS5vL5Y5ecOEkEdSCoGT6EHhPIIAqqKQlsV4z9xJD4sqhlH3fO5FeO+Ds7T4CWynZCYmhF+ayA==", "order"=>{"user_id"=>"2", "school_id"=>"1", "district_id"=>"1", "facility_school_id"=>"1", "date_orders_attributes"=>{"0"=>{"_destroy"=>"false", "order_date"=>"", "time_start"=>"", "time_end"=>""}}, "purpose"=>"Meeting or workshop", "attendees"=>"Mission High School students", "attendees_number"=>"", "description"=>"", "full_name"=>"", "user_group"=>"Mission High School student", "email"=>"", "phone_number"=>"", "occupation"=>""}, "commit"=>"Request to book"}
  School Load (1.4ms)  SELECT  "schools".* FROM "schools" WHERE "schools"."id" = ? LIMIT 1  [["id", nil]]
Completed 404 Not Found in 3ms (ActiveRecord: 1.4ms)

ActiveRecord::RecordNotFound (Couldn't find School with 'id'=):
  app/controllers/orders_controller.rb:13:in `create'

Answer 1

在查询中，您传递了 2 个值：
SELECT "schools".* FROM "schools" WHERE "schools"."id" = ? LIMIT 1 [["id", nil]] 错误是说 school.id = 'id='.

没有学校

我认为您需要做的是明确地将 @school 关联到 @order。

在创建函数中，添加：

@school = School.find(params[:school_id])
@order = Order.new(order_params)
@order.school = @school
if @order.save
....

在构造 @order 之前，您可能还需要从 order_params 中删除 school_id。

Answer 2

在 params 散列中，school_id 嵌套在 order 键下，因此您需要使用 params[:order][:school_id] 访问它。现在，params[:school_id] 将 return nil，这就是为什么您会收到实际上没有 ID 的错误消息。

您的参数：

Parameters: {
    "utf8"=>"✓",
    "authenticity_token"=>"X2mZC7JqEPdygS5vL5Y5ecOEkEdSCoGT6EHhPIIAqqKQlsV4z9xJD4sqhlH3fO5FeO+Ds7T4CWynZCYmhF+ayA==",
    "order"=>{
      "user_id"=>"2",
      "school_id"=>"1",
      "district_id"=>"1",
      "facility_school_id"=>"1",
      "date_orders_attributes"=>{
        "0"=>{"_destroy"=>"false", "order_date"=>"", "time_start"=>"", "time_end"=>""}},
      "purpose"=>"Meeting or workshop",
      "attendees"=>"Mission High School students",
      "attendees_number"=>"",
      "description"=>"",
      "full_name"=>"",
      "user_group"=>"Mission High School student",
      "email"=>"",
      "phone_number"=>"",
      "occupation"=>""},
      "commit"=>"Request to book"
  }

请注意 school_id 嵌套在 order 下。这无法通过 params[:school_id].

访问

编辑

所以现在从您的评论看来，当通过将 create 更改为 params[:order][:school_id] 来修复时，您会在 new 操作中遇到错误。

往后退一点，只需要在create动作中改成params[:order][:school_id]即可。对于 new 操作，您可以将其保留为 params[:school_id]。

Answer 3

刚刚解决了这个问题。

正如两位好心的评论者所指出的，我从参数中的 :school_id 开始，而我的创建操作在 :order 参数中包含 :school_id 。当我重定向创建 :order 的有缺陷的尝试时，Rails 找不到具有该 ID 的学校。虽然他们的解决方案都不适合我，但他们帮助我找到了解决方案。

我是怎么解决的：

def create
    @order = Order.new(order_params)
    @school = School.find(@order.school_id)
    if @order.save
        flash[:success] = "Thank you for your request. We will get in touch with you shortly."
        render @order
    else
        **redirect_to "/schools/#{@school.id}/orders/new"**
    end
end

Rails - "Cannot find object with 'id'="

Rails - "Cannot find object with 'id'="

ruby-on-rails

nested-forms

ruby-on-rails-4