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app/controllers/wechats_controller.rb

@@ -148,7 +148,7 @@ class WechatsController < ActionController::Base
        #补全用户信息
 
        uw = UserWechat.find_by_id(params[:openid])
-       uw.user = user
+       uw.user_id = user.id
        uw.save!
     rescue Exception=>e
       @wechat_bind_errors = e.message

app/models/user_wechat.rb

@@ -1,6 +1,6 @@
 class UserWechat < ActiveRecord::Base
   attr_accessible :subscribe, :openid, :nickname, :sex, :language, :city, :province, :country,
-                  :headimgurl, :subscribe_time, :unionid, :remark, :groupid, :user
+                  :headimgurl, :subscribe_time, :unionid, :remark, :groupid, :user, :user_id
 
   belongs_to :user
 end