Ruby Datamapper .count始终返回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]）