调整

app/controllers/weapps/sessions_controller.rb

@@ -17,7 +17,12 @@ class Weapps::SessionsController < Weapps::BaseController
 
     # session[:wechat_user_extra].delete(:nickName)
     # 绑定微信号
-    OpenUsers::Wechat.create!(user: user, uid: session_unionid) if user.wechat_open_user.blank?
+    open_user = OpenUsers::Wechat.find_by(uid: session_unionid)
+    if open_user.present? && open_user.user_id.nil?
+      open_user.update!(user_id: user.id)
+    elsif user.wechat_open_user.blank?
+      OpenUsers::Wechat.create!(user: user, uid: session_unionid)
+    end
 
     successful_authentication(user)
   end

app/controllers/weapps/unbind_accounts_controller.rb

@@ -7,7 +7,7 @@ class Weapps::UnbindAccountsController < Weapps::BaseController
 
   def destroy
     open_user = OpenUsers::Wechat.find_by!(user_id: current_user.id)
-    open_user.destroy!
+    open_user.destroy!(user_id: nil)
     UserAction.create(action_id: current_user.id, action_type: "UnbindWechat", user_id: current_user.id, :ip => request.remote_ip)
     logout_user
     render_ok