Ruby Datamapper .count始终返回0 [英] Ruby Datamapper .count always returns 0
本文介绍了Ruby Datamapper .count始终返回0的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
每当我尝试计算从datamapper返回的记录时，无论是否有用户，它总是返回0。
Whenever I try and count the returned records from datamapper it always returns as 0, whether there is a user or not.
User.count(:username=>params[:username])
class User
include DataMapper::Resource
property :id, Serial
property :username, String, unique_index: true, required: true, length: 3..32
property :password, String, required: true, length: 5..64
property :email, String, unique_index: true, required: true, format: :email_address
end
推荐答案
可以在控制台
中尝试 User.all（：username => params [：username]）和然后为该ENV尝试
Can you try User.all(:username=>params[:username]) in console
and then try
User.count（：username => params [：username]）
这篇关于Ruby Datamapper .count始终返回0的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
