类型不匹配：找到字符串，需要 io.gatling.core.validation.Validation[String]

Question

免责声明：我对 Scala 不太熟悉，所以我可能在做一些愚蠢的事情。

我们使用 Gatling 进行性能测试。我目前正在尝试让它向我们的 API 提交 POST 请求，使用如下内容：

exec(http("post request")
  .post("http://ourApi")
  .body(
      StringBody(
          session => """{ "myContent": "value" }""" // 1
      )
  )
  .asJSON
  .check(status.is(200))
)

如您所见，我在标记为 // 1 的行中使用 StringBody 的表达式函数，这应该是可能的 according to the Gatling documentation.

当我尝试运行时，我在该行收到 ZincCompiler 错误：

type mismatch;
 found   : String("{ \"myContent\": \"value\" }")
 required: io.gatling.core.validation.Validation[String]

为什么要 Validation[String]？在文档中我也只看到字符串...

Answer 1

您链接的页面显示

Expression

Most Gatling DSL methods actually takes Expression[T] parameters, which is a type alias for Session => Validation[T].

How is it that one can also pass Strings and other values then?

The reason is that there are implicit conversions:

when passing a String, it gets automagically parsed turn them into Expressions thanks to Gatling EL compiler.

when passing a value of another type, it gets automagically wrapped into an Expression that will always return this static value.

所以问题是由于某种原因没有触发隐式转换。来自http://gatling.io/docs/2.2.2/session/validation.html#validation，你可以试试：

添加import io.gatling.commons.validation._.
如果这没有帮助，请明确使用 Success("""{ "myContent": "value" }""")。

类型不匹配：找到字符串，需要 io.gatling.core.validation.Validation[String]

Type mismatch: found String, required io.gatling.core.validation.Validation[String]

scala

gatling