注册用户时好多用户字段没有，默认为null

app/api/mobile/api.rb

@@ -12,7 +12,7 @@ module Mobile
       end
 
       def authenticate!
-        raise 'Unauthorized. Invalid or expired token.' unless current_user
+        raise('Unauthorized. Invalid or expired token.') unless current_user
       end
 
       def current_user

app/api/mobile/apis/users.rb

@@ -14,7 +14,9 @@ module Mobile
           us = UsersService.new
           user = us.register params.merge(:password_confirmation => params[:password],
                                           :should_confirmation_password => true)
+          binding.pry
           raise "register failed #{user.errors.full_messages}" if user.new_record?
+          
           present :data, user, with: Mobile::Entities::User
           present :status, 0
         end

app/api/mobile/entities/user.rb

@@ -1,22 +1,28 @@
 module Mobile
     module Entities
     class User < Grape::Entity
-      expose :id
+      def self.user_expose(f)
+        expose f do |u,opt|
+          u.send(f) if u.respond_to?(f)
+        end
+      end
+
+      expose :id 
       #头像
-      expose :img_url
+      user_expose :img_url
       #昵称
       expose :nickname
       #性别
-      expose :gender
+      user_expose :gender
       #我的二维码
       #工作单位
-      expose :work_unit
+      user_expose :work_unit
       #邮箱地址
-      expose :mail
+      user_expose :mail
       #地区
-      expose :location
+      user_expose :location
       #签名
-      expose :brief_introduction
+      user_expose :brief_introduction
     end
   end
 

app/api/mobile/middleware/error_handler.rb

@@ -7,6 +7,7 @@ module Mobile
           @app.call(@env)
         rescue =>e
           message = {status: 1, message: e.message }.to_json
+          puts(detail: e.backtrace.join("\n")) if Rails.env.development?
           status = 200
           headers = { 'Content-Type' => content_type }
           Rack::Response.new([message], status, headers).finish
@@ -15,4 +16,4 @@ module Mobile
       end
     end
   end
-end
+end