回形针 - 测试图像是否已上传 [英] paperclip - test if images have been uploaded
问题描述
我有 2 个模型(书籍和图片)
I have 2 models (Book & Image)
class Book < ActiveRecord::Base
has_many :images
accepts_nested_attributes_for :images
end
class Image < ActiveRecord::Base
belongs_to :book
has_attached_file :data, :path => ":rails_root/public/system/datas/:book_id/:style/:basename.:extension",
:url => "/system/datas/:book_id/:style/:basename.:extension",
:styles => {
:thumb => ["150x172#",:jpg],
:large => ["100%", :jpg]
}
validates_attachment_presence :data
validates_attachment_content_type :data,
:content_type => ['image/jpeg', 'image/pjpeg',
'image/jpg', 'image/png', 'image/tiff', 'image/gif'], :message => "has to be in a proper format"
end
我想修改我的应用程序,以便当用户创建新书并上传图片时,他们被重定向到特定页面,否则他们被定向到显示"页面
I would like to modify my application so that when users create a new book and uploads an image, they’re redirected to a specific page, otherwise they are directed to the 'Show' page
我在 Book Controller 中修改了我的创建"操作,如下所示:
I have modified my 'create' action in the Book Controller as follows:
def create
@book = Book.new(params[:book])
if @book.save
flash[:notice] = 'Book was successfully created'
if params[:book][:image][:data].blank? # === this line is giving me errors
redirect_to @specific_page
else
redirect_to show_book_path(@book.id)
end
else
render :action => 'new'
end
end
我想测试如果上传了一张图片或多张图片,用户应该被定向到不同的页面
I want to test that if an image or multiple images have been uploaded, user should be directed to a different page
以下如果条件错误:
if params[:book][:image][:data].blank? # === this line is giving me errors
如果有人能建议我如何检查新书是否附加了图片,我将不胜感激.
I would appreciate it if someone could suggest me how to to check if images have been attached to the new Book.
请注意,我只想检查新上传的图片,而不是与图书相关的所有图片.
Please note that I want to check for only newly uploaded images, not all images associated with the book.
谢谢
推荐答案
首先,我不确定你的视图文件.但是如果用户没有选择/上传单个图像,那么 params[:book][:image] 将为零,因此 'if params[:book][:image][:data].blank?'行给出错误.
First of all, I am not sure about your view file. But if user has not selected/uploaded a single image, then params[:book][:image] will be nil and thus 'if params[:book][:image][:data].blank?' line give error.
尝试检查与书籍实例关联的图像"实例
Try checking the 'image' instances associated with book instance
if @book.images.any?
redirect_to @specific_page
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