Question

所以我的应用程序中有几个模型，它们都在ActiveAdmin中注册。他们都很好，除了一个，我无法弄清楚为什么。我一直得到同样的错误：

/ admin / reports上的NameError 未初始化的常量报告::用户

正在发生的模型称为Report

    class Report < ActiveRecord::Base
      belongs_to :users
      belongs_to :cars
      enum reason: [:accident,:totaled,:stolen]
      validates :reason, presence:true
    end

控制器如下所示：

Class ReportsController < ApplicationController
  before_action :authenticate_user!


  def create
    @car=Car.find(params[:car_id])
    @report=@car.reports.build(report_params)
    @report.user_id=current_user.id
    @report.car_id=@car.id
    if @report.save
      redirect_to car_path(car)
    else
      render 'new'
    end
  end

  def destroy
    @report=Report.find(params[:id])
    @report.destroy
  end

  private
  def report_params
    params.require(:report).permit(:reason)
  end
end

这是用于创建模型的迁移：

class CreateReports < ActiveRecord::Migration
  def change
    create_table :reports do |t|
      t.references :user, index: true
      t.references :car, index: true
      t.integer :reason, default: 0

      t.timestamps null: false
    end
    add_foreign_key :reports, :users
    add_foreign_key :reports, :cars
  end
end

最后这里是active_admin app / admin / report.rb：

ActiveAdmin.register Report do

# See permitted parameters documentation:
# https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
#
# permit_params :list, :of, :attributes, :on, :model
#
# or
#
# permit_params do
#   permitted = [:permitted, :attributes]
#   permitted << :other if resource.something?
#   permitted
# end


end

我一直想弄清楚几个小时。我在SO上看到的无法解决的解决方案。我跑了rails generate active_admin:resource Report来创建它，所以它是单数的。为什么会行为不端？

Answer 1

/ admin /上的NameError报告未初始化的常量Report :: Users

根据命名约定，belongs_to的 关联名称 应为单数。

class Report < ActiveRecord::Base belongs_to :user #here belongs_to :car #and here too enum reason: [:accident,:totaled,:stolen] validates :reason, presence:true end

活动管理员名称错误uninitializedconstant Resource :: Users

1 个答案: