使用paperclip使用Activeadmin Rails上传文件

Question

我使用Active admin作为我的rails应用程序后端.我想要上传文件.我该如何完成此功能？

Answer 1

我找到了一种方法来使用Paperclip和Active Admin.

我在我的模型"Event"中添加了这段代码:

has_attached_file :map, :styles => { :medium => "238x238>", 
                                   :thumb => "100x100>"
                                 }

我为我的管理模型做了这个:

ActiveAdmin.register Event do
 form :html => { :enctype => "multipart/form-data" } do |f|
   f.inputs "Details" do
    f.input :continent
    f.input :event_type
    f.input :name
    f.input :title
    f.input :content
    f.input :date_start, :as => :date
    f.input :date_end, :as => :date
    f.input :place
    f.input :map, :as => :file
    f.input :image, :as => :file, :hint => f.template.image_tag(f.object.image.url(:medium))
    f.input :userfull_info
    f.input :price
    f.input :phone, :as => :phone
    f.input :website, :as => :url
  end
  f.buttons
 end
end

要在索引页面上使用它,您必须使用:

column "Image" do |event|
    link_to(image_tag(event.image.url(:thumb), :height => '100'), admin_event_path(event))
  end
  default_actions
end

Answer 2

它适用于Rails 4.1和Paperclip 4.1:

模型

class Hotel < ActiveRecord::Base

has_attached_file :thumbnail, :styles => { :medium =>     "300x300#", :thumb => "200x200#" }
validates_attachment :thumbnail, content_type: { content_type:     ["image/jpg", "image/jpeg", "image/png"] }

end

管理模型

ActiveAdmin.register Hotel do

permit_params :name, :description, :price, :thumbnail

form do |f|
  f.inputs "Project Details" do
    f.input :name
    f.input :thumbnail, :required => false, :as => :file
    # Will preview the image when the object is edited
  end
  f.actions
 end

show do |ad|
  attributes_table do
    row :name
    row :thumbnail do
      image_tag(ad.thumbnail.url(:thumb))
    end
    # Will display the image on show object page
  end
 end
end

Answer 3

我正在使用rails 3.0.1和以下代码

f.input :image, :hint => "current image: #{f.template.image_tag(f.object.image.url(:thumb))}" 

返回一个字符串.在搜索解决方案后,我找到了它.

f.input :image, :hint => f.template.image_tag(f.object.image.url(:thumb))

直接发送对象,将图像返回给html

Answer 4

在用于显示文件字段的最新版本的ActiveAdmin和Rails 4中,我们需要使用以下代码

以前我们使用 f.input:uploads,:as =>:file

ActiveAdmin.register Project do
  permit_params :name, :uploads


  form multipart: true do |f|
    f.inputs "Project Details" do
      f.input :name
      f.input :uploads, required: false
    end
    f.actions
  end

end