Question

我有嵌套资源 - 用户有很多制造商和制造商有很多行。我写了一个before_filter来加载@manufacturer所以它可以通过lines_controller中的其余函数。问题是，当我在行/节目视图上点击编辑时，我遇到了问题。

错误：无法找到ID = manufacturer_id

的制造商

77   def load_manufacturer
78     @manufacturer = Manufacturer.find(params[:manufacturer_id])
79   end

所以，我正在与之合作：

应用程序/视图/线/ show.html.erb

<p id="notice"><%= notice %></p>

<p>
  <strong>Name:</strong>
  <%= @line.name %>
</p>

<p>
  <strong>Manufacturer:</strong>
  <%= @line.manufacturer_id %>
</p>

<%= link_to 'Edit', edit_manufacturer_line_path(:manufacturer_id,@line) %> |
<%= link_to 'Back', manufacturer_lines_path(@line.manufacturer_id) %>

lines_controller.rb

class LinesController < ApplicationController
  before_action :set_line, only: [:show, :edit, :update, :destroy]
  before_filter :load_manufacturer

  # GET /lines
  # GET /lines.json
  def index
    @lines = Line.all
  end

  # GET /lines/1
  # GET /lines/1.json
  def show
  end

  # GET /lines/new
  def new
    @manufacturer = Manufacturer.find(params[:manufacturer_id])
    @line = @manufacturer.lines.build
  end

  # GET /lines/1/edit
  def edit
  end

  # POST /lines
  # POST /lines.json
  def create
    @line = @manufacturer.lines.build(line_params)

    respond_to do |format|
      if @line.save
        format.html { redirect_to manufacturer_line_path(@manufacturer, @line), notice: 'Line was successfully created.' }
        format.json { render action: 'show', status: :created, location: @line }
      else
        format.html { render action: 'new' }
        format.json { render json: @line.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /lines/1
  # PATCH/PUT /lines/1.json
  def update
    respond_to do |format|
      if @line.update(line_params)
        format.html { redirect_to manufacturer_line_path(@manufacturer, @line), notice: 'Line was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @line.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /lines/1
  # DELETE /lines/1.json
  def destroy
    @line.destroy
    respond_to do |format|
      format.html { redirect_to manufacturer_lines_url(@manufacturer) }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_line
      @line = Line.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def line_params
      params.require(:line).permit(:name, :manufacturer_id)
    end

    def load_manufacturer
      @manufacturer = Manufacturer.find(params[:manufacturer_id])
    end
end

Answer 1

此：

 <%= link_to 'Edit', edit_manufacturer_line_path(:manufacturer_id,@line) %>

应该是

<%= link_to 'Edit', edit_manufacturer_line_path(@manufacturer,@line) %>

正在发生的是将符号:manufacturer_id更改为字符串并将其传递给路线，以便您的路线看起来像

`/manufacturers/manufacturer_id/lines/###/edit`

何时需要

/manufacturers/###/lines/###/edit

before_filter用于嵌套资源

1 个答案: