fohow_admin/app/models/sign_up_channel.rb

# encoding:utf-8
#小程序码
class SignUpChannel < ActiveRecord::Base
  has_paper_trail
  self.table_name = "sign_up_channels"
  belongs_to :parent_signup_channel, :foreign_key => :parent_id

  rails_admin do
    navigation_label '用户管理'
    weight -300

    list do
      filters [:id, :channel_value, :invite_id]   
      field :id
      field :parent_signup_channel
      field :qrcode_path
      field :channel_value
      field :channel_url
      field :img do
          formatted_value do
              bindings[:view].tag(:img,{:src => bindings[:object].get_img,
                  :style => 'width: 100px;height: 100px;cursor: pointer;display: block;max-width: 100px;',
                  :onClick => "javascript:window.open('#{bindings[:object].get_img}')"})
          end
      end      
      field :invite_id
      field :qrcode_img_url
      field :scan_times
      field :created_at    
    end


    edit do
      field :parent_id
      field :channel_value
      field :channel_url
      field :invite_id
    end
  end

  def qrcode_path
    # url = "#{CONFIG_FILE["api_host"]}/v1/xcx/qrcode/generate"
      path =  "pages/start/start?scene=#{self.id}"
    return path
  end

  def qrcode_img_url
    # url = "#{CONFIG_FILE["api_host"]}/v1/xcx/qrcode/generate"
      url =  "#{CONFIG_FILE["api_host"]}/v1/xcx/qrcode/channel/#{self.id}"
    if self.url_image.blank?
      open(url)
    end
    return url
  end

  def get_img
      url = "#{self.url_image}"
      return url
  end

end