ActionController :: RoutingError（没有路线与[POST]“ / cars / 1 / consumptions / new”匹配）：

Question

添加消耗（提交失败后）时出现此路由错误，并且被卡住，我在做什么错了？

用户可以拥有多辆汽车，并且他想照顾每辆汽车的汽油消耗。

我有三个活动记录模型

create_table "cars", force: :cascade do |t|
    t.string "car_name"
    t.integer "user_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "consumption_searches", force: :cascade do |t|
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "consumptions", force: :cascade do |t|
    t.float "total_price"
    t.float "kilometers"
    t.string "shop"
    t.float "liter_price"
    t.float "total_liters"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer "car_id"
  end

  create_table "users", force: :cascade do |t|
    t.string "email", default: "", null: false
    t.string "encrypted_password", default: "", null: false
    t.string "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["email"], name: "index_users_on_email", unique: true
    t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
  end

• 汽车belongs_to :users和has_many :consumptions
• 用户has_many :cars和has_many :consumptions through: :cars
• 消费belong_to :car和belongs_to :user

我在 consumptions_controller.rb

中的创建方法

def create 
    @car = Car.find(params[:car_id])
    @consumption = Consumptions.new(consumption_params)
    @consumption.car = @car
  if @consumption.save!
    redirect_to car_consumptions_path, notice: 'consumption was successfully created.'
  else
    render :new
  end
end

cars_controller.rb

def show
    @car = Car.find(params[:id])
    @search = ConsumptionSearch.new(params[:search])
    @consumptions = @search.date_range
    @consumptions = @consumptions.order('created_at ASC').where(car_id: @car.id)
end

视图/消耗/_form.html.erb

<%= simple_form_for car_consumptions_path do |f| %>
...
<% end %>

routes.rb

Rails.application.routes.draw do
  devise_for :users
    root to: "cars#index"

    resources :cars do
        resources :consumptions
    end
end

铁路路线| grep消费

  car_consumptions GET    /cars/:car_id/consumptions(.:format)                                                     consumptions#index
                          POST   /cars/:car_id/consumptions(.:format)                                                     consumptions#create
      new_car_consumption GET    /cars/:car_id/consumptions/new(.:format)                                                 consumptions#new
     edit_car_consumption GET    /cars/:car_id/consumptions/:id/edit(.:format)                                            consumptions#edit
          car_consumption GET    /cars/:car_id/consumptions/:id(.:format)                                                 consumptions#show
                          PATCH  /cars/:car_id/consumptions/:id(.:format)                                                 consumptions#update
                          PUT    /cars/:car_id/consumptions/:id(.:format)                                                 consumptions#update
                          DELETE /cars/:car_id/consumptions/:id(.:format)                                                 consumptions#destroy

根据要求

编辑

如果可以帮助的话，以下是HTML中的内容：

<form novalidate="novalidate" class="simple_form /cars/1/consumptions" action="/cars/1/consumptions/new" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓"><input type="hidden" name="authenticity_token" value="0nwq/pQSXCU2ptBjbewTCBffPLpZZUPAj6/HPQTGtYd8cHz9zv8R/C/JYnXPDpKw5o3/vGlVtav2Sa2nSvgOQdQ==">

Answer 1

尝试一下：

 <%= form_for [@cars, @consumptions] do |form| %>
      ...
  <% end %>

或

<%= form_with(model: [ @cars, @consumptions ]) do |form| %>

***更新：

resources :cars, shallow: true do
    resources :consumptions
end

格式：

<% = simple_form_for [@car, @consumption] do |f| %>

Answer 2

您没有显示new动作，但是我假设您正在设置@car和@consumption = @car.consumptions.build变量。

尝试一下：

simple_form_for @consumption, url: url_for(controller: :consumptions, action: :create, car_id: @car.id) do |f|

它应该与simple_form_for [@car, @consumption] do |f|一起使用，但是您却说“它不起作用”，这太含糊了（这怎么不起作用？相同的错误？新的错误？您在回答答案时应该更加清楚）< / p>

Answer 3

让我们从控制器开始

# GET /cars/:car_id/consumptions/new
def new
  @car = Car.find(params[:car_id])
  @consumption = @car.consumptions.new
end

# POST /cars/:car_id/consumptions
def create 
  @car = Car.find(params[:car_id])
  @consumption = @car.consumptions.new(consumption_params)
  # `.save!` will raise an exception and blow up if the record is invalid. 
  # Not good.
  if @consumption.save
    redirect_to car_consumptions_path(@car), notice: 'consumption was successfully created.'
  else
    render :new
  end
end

注意重定向：

# consumptions#index
redirect_to car_consumptions_path(@car), notice: 'consumption was successfully created.'

由于这是嵌套路由，因此您需要提供car_id段。

您还可以重定向到：

# consumptions#show
redirect_to [@car, @consumption], notice: 'consumption was successfully created.'
# or to cars#show
redirect_to @car, notice: 'consumption was successfully created.'

使用simple_form_for时，您将模型绑定到表单上，并传递给它。在为嵌套路线创建表单时，您应该传递一个数组：

<%= simple_form_for([@car, @consumption]) do |f| %>

<% end %>

这使用polymorphic route helpers查找正确的路径。您可以对link_to，redirect_to，url_for和path_for使用相同的签名。

在声明嵌套路由时，应考虑using the shallow option。它将仅嵌套收集路由（新建，创建，索引），而不嵌套成员路由。

Answer 4

df[df['var1']=='Y'].hist()

我在您的路线中看不到任何“ car_consumptions”。