Golang- Getting struct attribute name

Question

I want to return the name of a struct attribute using the reflect package. So far I have:

type MultiQuestions struct {
    QuestionId      int64  
    QuestionType    string 
    QuestionText    string 
}
func (q *MultiQuestions) StructAttrName() string {
    return reflect.ValueOf(q).Elem().Field(0).Name
}

However, this gives me a error reflect.ValueOf(q).Elem().Field(0).Name undefined (type reflect.Value has no field or method Name)

I tried casting to StructField but that didn't work either. How do I get at the name of Struct?

In this case, the names I am interested in are QuestionId, QuestionType and QuestionText.

OneOfOne · Accepted Answer · 2014-08-04 22:10:03Z

6

You need to operate on the Type not the Value

func (q *MultiQuestions) StructAttrName() string {
    return reflect.Indirect(reflect.ValueOf(q)).Type().Field(0).Name
}

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answered Aug 4, 2014 at 22:10

OneOfOne

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Comments

fabmilo · Accepted Answer · 2014-08-04 22:10:32Z

0

Use the Type:

package main

import (
    "fmt"
    "reflect"
)

type MultiQuestions struct {
    QuestionId   int64
    QuestionType string
    QuestionText string
}

func (q *MultiQuestions) StructAttrName() string {
    return reflect.TypeOf(q).Elem().Field(0).Name
}

func main() {
    fmt.Println((&MultiQuestions{}).StructAttrName())
}

http://play.golang.org/p/su7VIKXBE2

answered Aug 4, 2014 at 22:10

fabmilo

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Comments

VonC · Accepted Answer · 2014-08-05 06:00:34Z

You also can consider to utility functions defined in github.com/fatih/structure, like the Fields(s interface{}) []string one, which work on pointers or objects, including struct fields within the struct.

package main

import (
    "fmt"
    "reflect"

    "github.com/fatih/structure"
)

type MultiQuestions struct {
    QuestionId   int64
    QuestionType string
    QuestionText string
    SubMQ        SubMultiQuestions
}

type SubMultiQuestions struct{}

func (q *MultiQuestions) StructAttrName() string {
    return reflect.Indirect(reflect.ValueOf(q)).Type().Field(0).Name
}

func main() {
    fmt.Println((&MultiQuestions{}).StructAttrName())
    fmt.Println(Fields(&MultiQuestions{}))
    fmt.Println(Fields(MultiQuestions{}))
}

Output:

SubMQ
[QuestionId QuestionType QuestionText SubMQ]
[QuestionId QuestionType QuestionText SubMQ]

See a full example in this play.golang.org

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