Question

我正在使用Rails 5.1书进行敏捷Web开发。我试图上传图片文件。本书中的示例并没有进入本节中的routes.rb，我显然没有正确理解这一部分，因为加载浏览器时出现此错误：

Routing Error - undefined local variable or method 'applicationController' for main:Object

的routes.rb

Rails.application.routes.draw do

  resources :orders
  resources :line_items
  resources :carts
  resources :pictures
  root 'store#index', as: 'store_index'

  resources :products do
    get :who_bought, on: :member
  end

  get 'upload/new', to: 'upload#get'
end

我一直在尝试其他变体，但总是没有路由匹配错误：

get 'upload/new', to: 'upload#new'或获取'upload/get', to: 'upload#get'

upload_controller.rb

class UploadController < applicationController

  def get //the book uses method 'get', would normally expect 'new'
    @picture = Picture.new
  end

  def picture
    @picture = Picture.find(params[:id])
    send_data(@picture.data, filename: @picture.name, type: @picture.content_type, disposition: "inline")
  end

  def save
    @picture = Picture.new(picture_params)
      if @picture.save
        redirect_to(action: 'show', id: @picture.id)
      else
      render(action: :get)
      end
  end

  def show
    @picture = Picture.find(params[:id])
  end

  private

    def picture_params
      params.require(:picture).permit(:comment, :upload_picture)
    end

end

模型/ picture.rb

不要期望该模型导致路线出现问题，而是为了完整性而添加它。

class Picture < ActiveRecord::Base
  validates_format_of :content_type, with: /|Aimage/, message: "must be a picture"

  def uploaded_picture=(picture_field)
    self.name         = base_part_of(picture_field.original_filename)
    self.content_type = picture_field.content_type.chomp
    self.data         = picture_field.read
  end

  def base_part_of(file_name)
    File.basement(file_name).gsub(/[^|w._-]/, '')
  end
end

Answer 1

这里的问题是出错的命名约定。您继承的控制器是ApplicationController而不是applicationController根据rails控制器名称的命名约定，始终是CamelCase。有关更多命名约定，请查看此link

您需要将class UploadController < applicationController替换为class UploadController < ApplicationController

Answer 2

您的写作不正确applicationController更改为如下所示

class UploadController < ApplicationController

application至Application

那就是它，希望它有所帮助

路由错误未定义的局部变量或方法`applicationController＆＃39; for main：对象

2 个答案: