我正在尝试使用carrierwave gem将图片上传到我的rails应用程序,但无法弄清楚如何使用image_tag帮助程序显示照片。我实际上不确定照片是否正在上传,因为我收到了.image_url的NoMethodError消息。照片模型属于场所模型。
<%= simple_form_for @photo, url: place_photos_path(@place) do |f| %>
<%= f.input :caption %>
<%= f.input :picture %>
<%= f.submit "Add a photo", class: 'btn btn-primary' %>
<% end %>
<% if @place.photos.any? %>
<% @place.photos.each do |photo| %>
<%= photo.caption%>
<%= image_tag photo.image_url.to_s if photo.image_url.present? %>
<% end %>
<% end %>
class Photo < ApplicationRecord
belongs_to :user
belongs_to :place
mount_uploader :picture, PictureUploader
end
class PictureUploader < CarrierWave::Uploader::Base
storage :file
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
class Place < ApplicationRecord
belongs_to :user
has_many :comments
has_many :photos
geocoded_by :address
after_validation :geocode
validates :name, presence: true
validates :address, presence: true
validates :description, presence: true
end
end
如果发布模型和上传者代码,将更容易发现问题:
我相信您使用的是载波文档中指定的代码:
class Photo < ActiveRecord::Base
mount_uploader :picture, ImageUploader
end
然后您所要做的就是使用此:
<%= image_tag photo.picture.url, class: 'class-name' %>
有关上传者的更多信息,请从此处https://github.com/carrierwaveuploader/carrierwave#getting-started中读取