Often a constraint message needs to be "customized" in a particular context because what appears to be one constraint is indeed two different constraints applied in different contexts.
一条约束消息需要在特定上下文中“自定义”通常是因为，看似是一个约束的内容，实际上是两个适用于不同上下文的不同约束。
For example, when a constraint is violated, you might want to provide a link from the informative message to the field that is primarily responsible for the violation.
例如，当违反条件时，可能希望在信息性消息中提供违反条件的字段的链接。
The Message Key is used for display purposes when the constraint fails.
Message Key用来显示约束失败的情况。
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