embedly- 使用者填入網址，網站自動抓標題和簡介

使用者可以填入網址，網站自動抓標題和簡介 http://embed.ly/docs/tutorials/jquery_preview

參考解法
Xdite 解法
由後端抓


1. 安裝 embedly  https://github.com/embedly/embedly-ruby

gem install embedly




2.修改LinksController
   產生時要先有url , 後續再修改model 

def create
  @link = current_user.links.build(link_params)
  @link.save

  redirect_to root_path
 end


 private 
 def link_params
  params.require(:link).permit(:url,:user_id)
 end

3. 修改link model
   用after_create , 再來update由embedly抓回來的資料

class Link < ActiveRecord::Base

 belongs_to :user
 after_create :update_from_embedly

   def update_from_embedly

     link = self

     embedly_api = Embedly::API.new(:key => Setting.embedly_key)
     embedly_objs = embedly_api.oembed :url => link.url
     embedly_obj = embedly_objs[0]

     response_data = embedly_obj.marshal_dump

     link.title             =  response_data[:title]
     link.link_type         =  response_data[:type]
     link.provider_name     =  response_data[:provider_name]
     link.provider_url      =  response_data[:provider_url]
     link.description       =  response_data[:description]
     link.thumbnail_url     =  response_data[:thumbnail_url]
     link.thumbnail_width   =  response_data[:thumbnail_width]
     link.thumbnail_height  =  response_data[:thumbnail_height]

     link.save
   end

end