nested_scaffold URLGenerationError

Question

我的错误是：

没有匹配{：action=>“新建”、:advertiser_id=>"2“、：controller=>”分析“的路由，缺少所需密钥的:experiment_id=>nil}：:experiment_id

错误发生在

app/views/analyses/index.html.erb:29:in `_app_views_analyses_index_html_erb___267178907_46340268‘

它指向我的index.html.erb中的这段代码。

<%= link_to 'New Analysis',  new_advertiser_experiment_analysis_path(params[:experiment_id]) %>

此错误还显示正在传递的参数如下：

参数：{"advertiser_id"=>"9"，“experiment_id”“=>”2“}

不知道为什么它告诉我它不知道experiment_id。

这里是我的分析控制器

class AnalysesController < ApplicationController
  before_action :set_analyses
  before_action :set_analysis, only: [:show, :edit, :update, :destroy]


  # GET experiments/1/analyses
  def index
    @analyses = @experiment.analyses
  end

  # GET experiments/1/analyses/1
  def show
  end

  # GET experiments/1/analyses/new
  def new
    @analysis = @experiment.analyses.build
  end

  # GET experiments/1/analyses/1/edit
  def edit
  end

  # POST experiments/1/analyses
  def create
    @analysis = @experiment.analyses.build(analysis_params)

    if @analysis.save
      redirect_to([@analysis.experiment, @analysis], notice: 'Analysis was successfully created.')
    else
      render action: 'new'
    end
  end

  # PUT experiments/1/analyses/1
  def update
    if @analysis.update_attributes(analysis_params)
      redirect_to([@analysis.experiment, @analysis], notice: 'Analysis was successfully updated.')
    else
      render action: 'edit'
    end
  end

  # DELETE experiments/1/analyses/1
  def destroy
    @analysis.destroy

    redirect_to experiment_analyses_url(@experiment)
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_analyses
      @experiment = Experiment.find(params[:experiment_id])
    end

    def set_analysis
      @analysis = @experiment.analyses.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def analysis_params
      params.require(:analysis).permit(:conversion, :aov, :win_loss, :notes)
    end

end

Answer 1

从当前代码中可以看出，您有三个级别的资源嵌套。e-g：

resources :advertiser do 
  resources :experiment do 
  resources :analysis
  end 
end

因此，路由new_advertiser_experiment_analysis_path需要两个ids。一个用于advertiser，另一个用于experiment，因此您只是传递单个id，它被认为是advertiser_id (它遵循我们提供id的顺序，如果没有通过散列来解释的话)，所以对于experiment_id它得到零，这就是失败的原因。所以你需要

<%= link_to 'New Analysis',  new_advertiser_experiment_analysis_path(advertiser_id: params[:advertiser_id] , experiment_id: params[:experiment_id]) %>

检查Rails嵌套路由以获得完整的指南。