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嘿，所以这真的让我很烦。我已经通过简单的图像上传将 Carrierwave 实现到我的应用程序中。我试图验证图像是正确的文件类型，但我得到了一些奇怪的结果。以下是相关代码：

class Art < ActiveRecord::Base
belongs_to :collection
attr_accessible :image, :collection_id, :remote_image_url
mount_uploader :image, ImageUploader
validates_integrity_of :image
validates_presence_of :image
validates_processing_of :image
end


class ImageUploader < CarrierWave::Uploader::Base

include CarrierWave::MiniMagick

storage :file

def store_dir
  "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end

def extension_white_list
  %w(jpg jpeg gif)
end


class ArtsController < ApplicationController

def new
  @art = Art.new(:collection_id => params[:collection_id])
end

def edit
  @art = Art.find(params[:id])
end

def create
  @art = Art.new(params[:art])
    if @art.save
      flash[:notice] = "Successfully created art."
  redirect_to @art.collection
    else
      flash[:error] = @art.errors
  render :action => :new
   end
end

def update
  @art = Art.find(params[:id])

    if @art.update_attributes(params[:art])
  flash[:notice] = "Successfully updated art."
  redirect_to @art.collection
    else
  flash[:error] = @art.errors
  render :action => :edit
  end
end

def destroy
  @art = Art.find(params[:id])
  @art.destroy
flash[:notice] = "Successfully destroyed art."
redirect_to @art.collection
  end
end


en:
  errors:
   messages:
     carrierwave_processing_error: "Cannot resize image."
     carrierwave_integrity_error: "Not an image."
     carrierwave_download_error: "Couldn't download image."
     extension_white_list_error: "NOT ALLOWED"
     extension_black_list_error: "You are not allowed to upload %{extension} files, 
     prohibited types: %{prohibited_types}"

因此，当我使用 png 文件格式创建新的艺术品时，会出现图像不能为空白的错误。我知道这是 validates_presence_of 被触发，但我提供的东西格式不正确。如果我删除 validates_presence_of 不正确的文件格式将不会显示，但仍会被创建。我还将 i18n 错误消息添加到我的 en.yml 文件中。我对 Rails 有点陌生，所以我认为我的控制器在创建每件艺术品时存在问题，但我不确定我做错了什么。

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