= < , > , <= >= 和 ~> ~>
=
<
>
<=
>=
~>
这个 ~> 运算符的意思是:在同一版本中匹配,这取决于您希望它的具体程度,下面是一些示例:
Specification From ... To (exclusive) ">= 3.0" 3.0 ... ∞ "~> 3.0" 3.0 ... 4.0 "~> 3.0.0" 3.0.0 ... 3.1 "~> 3.5" 3.5 ... 4.0 "~> 3.5.0" 3.5.0 ... 3.6
Source