Question

尝试使用Paperclip gem在我的Rails视图中显示图像时，我遇到了一个问题。每当我尝试使用<%= image_tag @event.image.url %>渲染存储在我的数据库中的图像时，allI get就是消息＆＃34; Graph返回错误。必须使用Active访问令牌来查询有关当前用户的信息＆＃34;。

必须注意三件事： 1）我是Ruby on Rails中的菜鸟。 2）我的应用程序中没有用户模型或任何access_token要求。 3）所有其他数据在视图中渲染得很好，显然包括图像在内的所有数据都正确地传递到数据库中。

控制器：

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

  # GET /events
  # GET /events.json
  def index
    @events = Event.all
  end

  # GET /events/1
  # GET /events/1.json
  def show
    @event = Event.find(params[:id])
  end

  # GET /events/new
  def new
    @event = Event.new
  end

  # GET /events/1/edit
  def edit
  end

  # POST /events
  # POST /events.json
  def create
    @event = Event.new(event_params)

    respond_to do |format|
      if @event.save
        format.html { redirect_to @event, notice: 'Event was successfully created.' }
        format.json { render :show, status: :created, location: @event }
      else
        format.html { render :new }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /events/1
  # PATCH/PUT /events/1.json
  def update
    respond_to do |format|
      if @event.update(event_params)
        format.html { redirect_to @event, notice: 'Event was successfully updated.' }
        format.json { render :show, status: :ok, location: @event }
      else
        format.html { render :edit }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /events/1
  # DELETE /events/1.json
  def destroy
    @event.destroy
    respond_to do |format|
      format.html { redirect_to events_url, notice: 'Event was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def event_params
      params.require(:event).permit(:title, :date, :address, :cost, :image, :description)
    end
end

活动模型：

class Event < ActiveRecord::Base
  has_attached_file :image, styles: { medium: "300x300>", thumb: "100x100>" }#, default_url: "/images/:style/missing.png"
  validates_attachment_content_type :image, content_type: /\Aimage\/.*\Z/
end

＆＃39;显示＆＃39;视图：

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


<%= image_tag @event.image.url %>


<p>
  <strong>Title:</strong>
  <%= @event.title %>
</p>

<p>
  <strong>Date:</strong>
  <%= @event.date %>
</p>

<p>
  <strong>Address:</strong>
  <%= @event.address %>
</p>

<p>
  <strong>Cost:</strong>
  <%= @event.cost %>
</p>

<p>
  <strong>Image:</strong>
  <%= image_tag @event.image.url %>
</p>

<p>
  <strong>Description:</strong>
  <%= @event.description %>
</p>

<%= link_to 'Edit', edit_event_path(@event) %> |
<%= link_to 'Back', events_path %>

我真的很感谢你的帮助，因为我已经坚持了几天这个问题了。

Rails：Paperclip Gem触发器＆＃34;必须使用访问令牌......＆＃34;渲染图像时

0 个答案: