已绑定成功的，直接提示

app/controllers/wechats_controller.rb

@@ -162,7 +162,6 @@ class WechatsController < ActionController::Base
         code = params[:code] || session[:wechat_code]
         openid = get_openid_from_code(code)
 
-
         raise "无法获取到微信openid" unless openid
         render :json => {status:0, openid: openid}
       rescue Exception=>e
@@ -197,6 +196,9 @@ class WechatsController < ActionController::Base
 
     def login
       session[:wechat_code] = params[:code] if params[:code]
+      openid = get_openid_from_code(code)
+      @wechat_user = user_binded?(openid)
+
       render 'wechats/login', layout: 'base_wechat'
     end
 

app/views/wechats/login.html.erb

@@ -1,4 +1,22 @@
+<% if @wechat_user %>
 
+    <div class="page">
+      <div class="weui_msg">
+        <div class="weui_icon_area"><i class="weui_icon_success weui_icon_msg"></i></div>
+        <div class="weui_text_area">
+          <h2 class="weui_msg_title">操作成功</h2>
+          <p class="weui_msg_desc">您已经绑定过微信了,用户名: (<%= @wechat_user.user.login %>)</p>
+        </div>
+        <div class="weui_opr_area">
+          <p class="weui_btn_area">
+            <a href="javascript:close();" class="weui_btn weui_btn_primary">确定</a>
+          </p>
+        </div>
+
+      </div>
+    </div>
+
+<% else %>
 <div class="loginIn">
   <div>
     <p class="weui_cells_title wechat-error">
@@ -64,3 +82,6 @@
     })
   });
 </script>
+
+
+<% end %>