Object Information

Introduction

The gstructs component is used to conveniently obtain information about structures.

This is a low-level component, rarely used in general business, but used in framework, basic library, and middleware writing.

Usage:

import "github.com/gogf/gf/v2/os/gstructs"

API Documentation:

https://pkg.go.dev/github.com/gogf/gf/v2/os/gstructs

Common Methods

Fields

• Description: Fields returns the fields of the Pointer attribute of the input parameter in in the form of a Field slice.

• Format:

Fields(in FieldsInput) ([]Field, error)

• Example:

func main() {
      type User struct {
          Id   int
          Name string `params:"name"`
          Pass string `my-tag1:"pass1" my-tag2:"pass2" params:"pass"`
      }
      var user *User
      fields, _ := gstructs.Fields(gstructs.FieldsInput{
          Pointer:         user,
          RecursiveOption: 0,
      })

      g.Dump(fields)
}

// Output:
[
      {
          Value:    "<int Value>",
          Field:    {
              Name:      "Id",
              PkgPath:   "",
              Type:      "int",
              Tag:       "",
              Offset:    0,
              Index:     [
                  0,
              ],
              Anonymous: false,
          },
          TagValue: "",
      },
      {
          Value:    {},
          Field:    {
              Name:      "Name",
              PkgPath:   "",
              Type:      "string",
              Tag:       "params:\"name\"",
              Offset:    8,
              Index:     [
                  1,
              ],
              Anonymous: false,
          },
          TagValue: "",
      },
      {
          Value:    {},
          Field:    {
              Name:      "Pass",
              PkgPath:   "",
              Type:      "string",
              Tag:       "my-tag1:\"pass1\" my-tag2:\"pass2\" params:\"pass\"",
              Offset:    24,
              Index:     [
                  2,
              ],
              Anonymous: false,
          },
          TagValue: "",
      },
]

TagMapName

• Description: TagMapName retrieves tag from the parameter pointer and returns it in the form of map[string]string.

• Note:

  • The type of parameter pointer should be struct/*struct.
  • Only exported fields (fields with an uppercase initial) will be returned.
  • Format:

TagMapName(pointer interface{}, priority []string) (map[string]string, error)

• Example:

func main() {
      type User struct {
          Id   int
          Name string `params:"name"`
          Pass string `my-tag1:"pass1" my-tag2:"pass2" params:"pass"`
      }
      var user User
      m, _ := gstructs.TagMapName(user, []string{"params"})

      g.Dump(m)
}

// Output:
{
      "name": "Name",
      "pass": "Pass",
}