request.withFormat {
form {
redirect humanInstance
//Explain : old grails redirect like redirect(action: "show", id: humanInstance.id)
//but in 2.3.0 by redirect humanInstance this statement i saw it goes to def show(Human humanInstance) action
//Q1: how it understand that it has to redirect def show(Human humanInstance) action ?
//cause here so many methods which receives humanInstance
//Q2: And where it get processed ?
}
'*' {
respond humanInstance, [status: CREATED]
}
//Explain : I tested it that in the above {works for normalCall}'*'{works for restCall}
//Q3: What is '*' operator do here what it's name?
}
答案 0 :(得分：2)
'*'是一种全能型，它与一个代码块相关联，如果没有其他块与accept头匹配，则应该执行该代码块。请参阅以下内容......
request.withFormat {
xml {
// execute this if the request content type is xml
}
json {
// execute this if the request content type is json
}
'*' {
// execute this if neither of the other 2 matched the request's content type
}
}
您可能希望了解这一点，包括您已配置的mime类型。您应该查看http://grails.org/doc/2.3.x/guide/theWebLayer.html#contentNegotiation上的官方用户指南的“内容协商”部分。
我希望这有用。
<强>更新
当你调用redirect（someDomainClassInstance）时，你最终会在https://github.com/grails/grails-core/blob/v2.3.8/grails-plugin-controllers/src/main/groovy/org/codehaus/groovy/grails/plugins/web/api/ControllersApi.java#L270
此时“method”的值为“GET_ID”。与GET_ID相关联的https://github.com/grails/grails-core/blob/v2.3.8/grails-web/src/main/groovy/org/codehaus/groovy/grails/web/mapping/DefaultLinkGenerator.groovy#L56中的值为“show”，这就是您将重定向到show方法的原因。