Rails中时间差计算命令报错是否为预期行为？原因是什么？

问题 #

这是否属于预期行为？

复现步骤 #

• 打开Rails控制台
• 输入以下命令并查看输出：

命令1

Time.zone.yesterday - Time.zone.now

输出：

/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/date/calculations.rb:104:in `-': expected numeric (TypeError)

命令2

Time.zone.now - Time.zone.yesterday

输出：

3.1.2 :002 > Time.zone.now - Time.zone.yesterday
/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/time/calculations.rb:209:in `ago': undefined method `-@' for Wed, 21 Sep 2022:Date (NoMethodError)

    since(-seconds)
          ^
Did you mean?  -
/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/time/calculations.rb:294:in `-': can't convert Date into an exact number (TypeError)

命令3

Time.zone.now - Time.zone.yesterday

输出：

/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/date/calculations.rb:104:in `-': expected numeric (TypeError)

命令4

3.1.2 :003 > Time.zone.now - Date.yesterday

输出：

/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/time/calculations.rb:209:in `ago': undefined method `-@' for Wed, 21 Sep 2022:Date (NoMethodError)

    since(-seconds)
          ^
Did you mean?  -
/Users/manishsharma/.rvm/gems/ruby-3.1.2/gems/activesupport-7.0.3.1/lib/active_support/core_ext/time/calculations.rb:294:in `-': can't convert Date into an exact number (TypeError)

系统配置 #

• Rails版本: 7.0.3.1
• Ruby版本: 3.1.2

内容的提问来源于stack exchange，提问作者Manish Sharma