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Play框架：从版本2.3.x迁移到2.4.1的问题

[英]Play Framework: Problems migrating from version 2.3.x to 2.4.1

原文 2015-06-28 20:48:12 9 1 json/ scala/ playframework

I'm migrating my Play application from version 2.3.8 to version 2.4.1... and I'm encountering some problems with JSON. 我正在将Play应用程序从2.3.8版迁移到2.4.1版...，并且遇到JSON问题。

The main issue is that now obj \\ key returns a JsLookupResult and statements like Json.arr(obj \\ key, 1) fail because Json.arr expects a JsValueWrapper . 主要问题在于，现在obj \\ key返回一个JsLookupResult并且诸如Json.arr(obj \\ key, 1)类的语句失败，因为Json.arr需要一个JsValueWrapper 。

How do I fix this issue? 如何解决此问题？

1 个解决方案

If you are certain that \\ will not fail, you can just call .get on it, as you would an Option . 如果确定\\不会失败，则可以像调用Option一样调用.get 。

Json.arr( (obj \\ key).get, 1)

Needless to say, there are other operands like getOrElse that can provide a default value in case obj has no key . 不用说，在obj没有key情况下，还有其他操作数（例如getOrElse可以提供默认值。

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