我有這樣的問題,我的simple_form需要圖像文件上傳字段和圖像url輸入。Rails圖像驗證simple_form
如何進行驗證,以便它可以是圖像文件上傳字段或圖像url,而不是二者都需要。
我在另一個控制器查看:
<%= f.simple_fields_for :photo_attributes do |d| %>
<%= d.label :image, :label => 'Upload logo' %>
<%= d.file_field :image, :label => 'Image' %>
<%= d.input :image_url, :label => 'Billed URL' %>
<% end %>
我的照片模式:
require 'open-uri'
class Photo < ActiveRecord::Base
belongs_to :virksomhed
attr_accessor :image_url
has_attached_file :image,
:url => "/public/images/billeder/photo/:id/:basename.:extension",
:path => ":rails_root/public/images/:id/:basename.:extension"
before_validation :download_remote_image, :if => :image_url_provided?
validates_presence_of :image_remote_url, :if => :image_url_provided?, :message => 'is invalid or inaccessible'
private
def image_url_provided?
!self.image_url.blank?
end
def download_remote_image
self.image = do_download_remote_image
self.image_remote_url = image_url
end
def do_download_remote_image
io = open(URI.parse(image_url))
def io.original_filename; base_uri.path.split('/').last; end
io.original_filename.blank? ? nil : io
rescue # catch url errors with validations instead of exceptions (Errno::ENOENT, OpenURI::HTTPError, etc...)
end
end
你想在模型中驗證這一點,所以當用戶提交表單時,你可以通過錯誤信息回覆他,他不能這樣做,或者你想要這個「活「,使用JavaScript,所以當用戶試圖在選擇了一些圖像後,將網址放入您的表單中,您是否告訴他他應該「決定」? – socjopata 2011-08-17 16:33:24
我想驗證用戶不能同時使用兩個字段,但現在需要1個字段simple_form需要兩個字段 – 2011-08-18 09:12:14