我改变了一个函数:
def submit = Action { request =>
signupForm.bindFromRequest()(request).fold(
// Form has errors
errors => BadRequest(html.signup.form(errors)),
// We got a valid User value, display the summary
user => {
// intensive computation involving database
Ok("okay")
}
)
}
到
def submit = Action { request =>
val result = Akka.future {
signupForm.bindFromRequest()(request).fold(
// Form has errors
errors => BadRequest(html.signup.form(errors)),
// We got a valid User value, display the summary
user => {
// intensive computation involving database
Ok("okay")
}
)
}
Async {
result
}
}
我得到编译错误:
[error] found : play.api.mvc.SimpleResult[_ >: java.lang.String with play.api.templates.Html <: java.io.Serializable]
[error] required: play.api.mvc.SimpleResult[_1(in value result)] where type _1(in value result) >: java.lang.String with play.api.templates.Html <: java.io.Serializable
[error] Note: java.io.Serializable >: _1, but class SimpleResult is invariant in type A.
[error] You may wish to define A as -A instead. (SLS 4.5)
[error] signupForm.bindFromRequest()(request).fold(
[error] ^
[error] one error found
错误消息似乎与方差有关。有谁知道发生了什么?
答案 0 :(得分:1)
BadRequest
正在返回类型SimpleResult[Html]
Ok
正在返回SimpleResult[String]
如果您使BadRequest
和Ok
返回相同的类型,则可以使用。
尝试执行Ok(Html("ok"))
- 或实际渲染页面。