ruby-on-rails - 设置 Paperclip Gem 后模型和 Controller 中的语法错误

Question

我正在学习 onemonthrails 教程。我刚刚安装了回形针 gem 并通过一些验证设置了模型。我以为我完全遵循了 tut，但是当我进入 localhost:3000/pin 时，我得到了这个指向模型和 Controller 的奇怪语法错误。在回形针安​​装之前我没有遇到这个问题...

这是错误:

SyntaxError (C:/Sites/code/omrails/app/models/pin.rb:7: syntax error, unexpected

'}', expecting tASSOC):

app/controllers/pins_controller.rb:9:in `index'

这是 github 分支，如果你进入 master 你可以看到我安装回形针之前的代码(当它工作正常时):

https://github.com/justuseapen/omrails/tree/error

编辑这是模型中有问题的代码:

class Pin < ActiveRecord::Base


    validates :description, presence: true
    validates :user_id, presence: true
    validates_attachment :image, presence: true
                                                                content_type: {content_type['image/jpeg','image/jpg','image/png','image/gif']}
                                                                size: {less_than: 5.megabytes }
    belongs_to :user
    has_attached_file :image, styles: {medium:"320x240"}

end

从 Controller :

   class PinsController < ApplicationController
  before_filter :authenticate_user!, except: [:index]

  before_action :set_pin, only: [:show, :edit, :update, :destroy]

  # GET /pins
  # GET /pins.json
  def index
    @pins = Pin.all
  end

  # GET /pins/1
  # GET /pins/1.json
  def show
  end

  # GET /pins/new
  def new
    @pin = current_user.pins.new


  end

  # GET /pins/1/edit
  def edit
    @pin=current_user.pins.find(params[:id])
  end

  # POST /pins
  # POST /pins.json
  def create
    @pin = current_user.pins.new(pin_params)

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

  # PATCH/PUT /pins/1
  # PATCH/PUT /pins/1.json
  def update
    @pin=current_user.pins.find(params[:id])
    respond_to do |format|
      if @pin.update(pin_params)
        format.html { redirect_to @pin, notice: 'Pin was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @pin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /pins/1
  # DELETE /pins/1.json
  def destroy
    @pin=current_user.pins.find(params[:id])
    @pin.destroy
    respond_to do |format|
      format.html { redirect_to pins_url }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def pin_params
      params.require(:pin).permit(:description, :image)
    end
end

解决方案:

好的。所以我不确定问题出在哪里，但我像这样重写了代码并且它起作用了:

    validates :description, presence: true
  validates :user_id, presence: true
  has_attached_file :image, styles: { medium: "320x240>"}
  validates_attachment :image, presence: true,
                            content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/png', 'image/gif'] },
                            size: { less_than: 5.megabytes }
  belongs_to :user

end

Answer 1

你在不应该有逗号的地方多了一个逗号。

validates_attachment :image, presence: true,

应该是

validates_attachment :image, presence: true