Rails has_many 嵌套表单没有路由匹配 [POST]

Question

我在提交嵌套表单时遇到上述错误，但我不知道如何解决。这是一些信息。确切的错误是No route matches [POST] "/vehicles/2/vehicle_records/new"。奇怪的是，当我运行 rake 路线时，路线存在我看到以下条目

/vehicles/:vehicle_id/vehicle_records/new(.:format)

车辆.rb

class Vehicle < ActiveRecord::Base
  has_many :vehicle_records,  dependent: :destroy
  accepts_nested_attributes_for :vehicle_records
end

vehicle_record.rb

class VehicleRecord < ActiveRecord::Base
  belongs_to :vehicle
end

我希望能够添加从车辆展示视图链接的车辆维护记录。

views/vehicle/show.html.erb

<h3><b>Vehicle ID:</b> <%= @vehicle.id %></h3>

<p><b>Year:</b> <%= @vehicle.year %></p>

<p><b>Make:</b> <%= @vehicle.make %></p>
<p><b>Model:</b> <%= @vehicle.model %></p>
<p><b>Work Last Performed:</b> <%= @vehicle.make %></p>


<h2>Maintenance Record</h2>
<table>
  <tr>
    <th>Date Performed</th>
    <th>Mileage</th>
    <th>Hours</th>
    <th>Work Performed</th>
  </tr>
  <% @vehicle.vehicle_records.each do |vr|%>
    <tr>
      <td><%= vr.date_performed %></td>
      <td><%= vr.mileage %></td>
      <td><%= vr.hours %></td>
      <td><%= vr.work_performed %></td>
    </tr>
  <% end %>
</table>

<%= link_to "Add Maintenance Record", new_vehicle_vehicle_record_path(@vehicle) %>

然后我链接到 vehicle_record 新表单

views/vehicle_records/new.html.erb

<%= form_for :vehicle_record do |vr| %>
  <p>
    <%= vr.label :date_performed%><br />
    <%= vr.text_field :date_performed%>
  </p>
  <p>
    <%= vr.label :mileage%><br />
    <%= vr.text_field :mileage%>
  </p>
  <p>
    <%= vr.label :mileage%><br />
    <%= vr.text_field :mileage%>
  </p>
  <p>
    <%= vr.label :hours%><br />
    <%= vr.text_field :hours%>
  </p>
  <p>
    <%= vr.label :work_performed%><br />
    <%= vr.text_area :work_performed%>
  </p>

  <p><%= vr.submit "Create Record" %></p>

我的车辆记录控制器如下

vehicle_records_controller.rb

class VehicleRecordsController < ApplicationController

  def new
    @vehicle_record = VehicleRecord.new
  end

  def create
    @vehicle_record = VehicleRecord.new(params[:vehicle_record])

    if @vehicle_record.save
      redirect_to vehicles_path
    else
      flash[:notice] = "Not Saved"
    end
  end
end

routes.rb

resources :vehicles do
  resources :vehicle_records
end

Answer 1

更新：无嵌套表单

所以我听说您只想编辑 vehicle_report 而不接触 vehicle。由于您已经将 vehicle_report 作为嵌套资源，您可以按如下方式修改控制器：

class VehicleRecordController < ApplicationController
  ...

  def new
    @vehicle = Vehicle.find params[:vehicle_id]
    @vehicle_record = @vehicle.vehicle_records.build
  end

  ...
end

create 方法的内容相当简单。然后您必须将表单更改为：

<%= form_for @vehicle_record do |v| %>
  ...
  <%= # vehicle record attributes %>
  ...
  <%= v.submit "Submit" %>

你很高兴！

原始答案：带嵌套表单

首先，我没有看到您使用任何嵌套表单。其次，我看不到您的vehicle_record 表单如何知道它实际上属于哪个vehicle（请参阅您的控制器）。在我看来，最简单的方法是允许使用nested forms 在vehicles/:id/edit 或vehicles/new 中直接添加和删除vehicle_records：

<%= form_for @vehicle do |v| %>
  ...
  <%= # vehicle attributes here %>
  ...
  <%= v.fields_for :vehicle_records do |vr| %>
    ...
    <%= # vehicle record attributes %>
    ...
  <%= v.submit "Submit" %>

对于现有的vehicles，fields_for 将呈现所有现有vehicle_records 的列表，对于新的，您可以在控制器中使用以下代码使fields_for 呈现例如三个空vehicle_records：

class VehicleController < ApplicationController
  ...

  def new
    @vehicle = new Vehicle
    3.times { @vehicle.vehicle_records.build }
  end

  ...
end

如果您希望每次编辑现有的vehicle 时始终拥有多个免费的vehicle_records，您可以使用类似的方法进行编辑并重复使用上述表单：

class VehicleController < ApplicationController
  ...

  def edit
    @vehicle = Vehicle.find params[:id]
    # Add one blank vehicle record to existing ones
    # This is also rendered by fields_for
    @vehicle.vehicle_records.build
  end

  ...
end