optionales Array in der Struktur

type testvalues struct {
    test1 string `json:"test1"`
    defaulttests []string `json:"__tests"`

    //defaulttests *array `json:"__tests,omitempty" validate:"option"`
    test2 string `json:"__test2"`
}

func (x *Controller) createTest(context *gin.Context, uniqueId string, testBody *TestValues) (*http.Response, error) {

    if testBody.DefaultTags {
        postBody, err := json.Marshal(map[string]string{
            "Test2":              testBody.Test2,
            "Test1":                  testBody.Test1,
            "defaultTests":         testBody.DefaultTests,
            "uniqueId":                  uniqueId,
        })
    } else {
        postBody, err := json.Marshal(map[string]string{
            "Test2":              testBody.Test2,
            "Test1":                  testBody.Test1,
            "uniqueId":                  uniqueId,
        })
    }

    ...
}

if len(testbody.defaulttests) > 0 {
  ...
}

package main

import "fmt"

type TestValues struct {
    Test1        string   `json:"test1"`
    DefaultTests []string `json:"__tests"`

    //DefaultTests *array `json:"__tests,omitempty" validate:"option"`
    Test2 string `json:"__Test2"`
}

func main() {
    var tv = TestValues{Test1: "test"}

    if len(tv.DefaultTests) > 0 {
        fmt.Printf("Default Tests: %v\n", tv.DefaultTests)
    } else {
        fmt.Printf("Default Tests empty value: %v\n", tv.DefaultTests)
    }
}