Question

我正在开发一个在后端使用Ruby on Rails的android应用程序。我使用Rails创建了REST API。我需要上传图像以及其他数据。基本上，我有"user"和"Event"对象。每个用户可以创建许多事件。用户可以将图像与事件描述一起附加。我将Postgres DB用于文本数据存储，并且工作正常。但是问题是当我将云API "Cloudinary"用于images时。我不知道是什么问题。我收到以下错误：

  {
    "status": 500,
    "error": "Internal Server Error",
    "exception": "#<NoMethodError: undefined method `upload' for nil:NilClass>",
    "traces": {
        "Application Trace": [
            {
                "exception_object_id": 78590280,
                "id": 26,
                "trace": "app/controllers/events_controller.rb:23:in `create'"
            }
        ],
        "Framework Trace": [
            {
                "exception_object_id": 78590280,
                "id": 0,
                "trace": "activestorage (6.0.1) app/models/active_storage/blob.rb:194:in `upload_without_unfurling'"
            },
            {
                "exception_object_id": 78590280,
                "id": 1,
                "trace": "activestorage (6.0.1) lib/active_storage/attached/changes/create_one.rb:25:in `upload'"
            },.....

当我从Postman测试API时，我已经完成了以下步骤：

我在Gemfile中添加了以下宝石：

gem 'cloudinary', require: false


gem 'activestorage-cloudinary-service'

然后我跑：

bundle
rails active_storage:install
rails db:migrate

我在config/storage.yml中添加了以下内容：

    cloudinary:
  service: Cloudinary
  cloud_name: <%= ENV['CLOUDINARY_CLOUD_NAME'] %>
  api_key:    <%= ENV['CLOUDINARY_API_KEY'] %>
  api_secret: <%= ENV['CLOUDINARY_API_SECRET'] %>

然后我在config/environments/**文件中添加了以下行：

config.active_storage.service = :cloudinary

Routes.rb如下所示：

Rails.application.routes.draw do
  resources :events do
    get :event_image, on: :member
  end
  resources :users
  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end

EventsController如下：

class EventsController < ApplicationController
  before_action :set_event, only: [:show, :update, :destroy]

  # GET /events
  def index
    @events = Event.all.with_attached_event_image

    render json: @events.map {|event|
    event.as_json.merge({event_image: url_for(event.event_image)})}
  end


  # GET /events/1
  def show
  event = Event.find(params[:id])
  render json: event.attributes.merge(event_image: url_for(event.event_image))

  end
  # POST /events
  def create
    @event = Event.new(event_params)
  #  Cloudinary::Uploader.upload(@event.event_image)
    if @event.save
      render json: @event, status: :created, location: @event
    else
      render json: @event.errors, status: :unprocessable_entity
    end
  end

  # PATCH/PUT /events/1
  def update
    if @event.update(event_params)
      render json: @event
    else
      render json: @event.errors, status: :unprocessable_entity
    end
  end

  # DELETE /events/1
  def destroy
     @event.destroy
  end

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

    # Only allow a trusted parameter "white list" through.
    def event_params
      params.require(:event).permit(:title, :description, :country, :city, :event_location, :event_date, :event_time, :event_status, :user_id, :event_image)
    end
end

请记住：该API在使用本地存储时效果很好！错误是当我将存储服务切换到:cloudinary时发生的。有人可以帮忙吗？

获取“ NoMethodError：nil：NilClass的未定义方法“上载””错误

0 个答案: