如何在Gatling中执行条件检查？解决${code}.equals(200)恒为假的问题

Hey there! Let's figure out why your Gatling condition check isn't working as expected. The root cause here is almost certainly a type mismatch—let's break this down and get it fixed.

The Problem Explained #

When you use ${code} in Gatling, you're pulling a value stored in the session as a String. But you're comparing it directly to the integer 200. Since equals() checks both value and type, a String like "200" will never equal the integer 200—hence the always-false result.

Solution 1: Convert the String to an Integer #

The most reliable way is to cast the session value to an integer before comparing. You can do this in two ways:

Using a Session Lambda

For more control, use a session lambda to explicitly convert the value:

.doIf(session => session("code").as[Int] == 200) {
  // Your logic to run when the code is 200
  exec(http("Success Request")
    .get("/api/success-endpoint"))
}

Using Gatling's Expression Language (EL)

You can also use inline EL to convert the string directly in the condition:

.doIf("${code.toInt() == 200}") {
  // Your conditional logic here
}

Solution 2: Compare as Strings (If Appropriate) #

If your API returns the code as a string (e.g., the JSON response has "code": "200"), you can instead compare to a string literal:

.doIf("${code.equals('200')}") {
  // Your logic here
}

Just make sure the value stored in code is actually a string matching "200"—this won't work if the original value was a numeric type.

Quick Check: Verify Your Extraction #

Before troubleshooting the condition, double-check that you're correctly extracting the code value from the response. For example, if you're using JSONPath:

.exec(http("Fetch Data")
  .get("/api/data")
  .check(jsonPath("$.response.code").saveAs("code")))

Ensure the JSONPath points to the right field, and that the field's type matches what you're expecting (numeric vs. string).

Final Tip #

If you're unsure about the type of the stored value, you can log it to verify:

.exec(session => {
  println(s"Code value: ${session("code")}, type: ${session("code").getClass}")
  session
})

This will print the value and its type to your console, helping you confirm exactly what you're working with.

内容的提问来源于stack exchange，提问作者Sarath