Skip to content
forked from jinzhu/copier

Copier for golang, copy value from struct to struct and more

License

Notifications You must be signed in to change notification settings

XiXiangFiles/copier

 
 

Repository files navigation

Copier

I am a copier, I copy everything from one to another

test status

Features

  • Copy from field to field with same name
  • Copy from method to field with same name
  • Copy from field to method with same name
  • Copy from slice to slice
  • Copy from struct to slice
  • Copy from map to map
  • Enforce copying a field with a tag
  • Ignore a field with a tag
  • Deep Copy

Usage

package main

import (
	"fmt"
	"github.com/jinzhu/copier"
)

type User struct {
	Name        string
	Role        string
	Age         int32
	EmployeeCode int64 `copier:"EmployeeNum"` // specify field name

	// Explicitly ignored in the destination struct.
	Salary   int
}

func (user *User) DoubleAge() int32 {
	return 2 * user.Age
}

// Tags in the destination Struct provide instructions to copier.Copy to ignore
// or enforce copying and to panic or return an error if a field was not copied.
type Employee struct {
	// Tell copier.Copy to panic if this field is not copied.
	Name      string `copier:"must"`

	// Tell copier.Copy to return an error if this field is not copied.
	Age       int32  `copier:"must,nopanic"`

	// Tell copier.Copy to explicitly ignore copying this field.
	Salary    int    `copier:"-"`

	DoubleAge int32
	EmployeeId int64 `copier:"EmployeeNum"` // specify field name
	SuperRole string
}

func (employee *Employee) Role(role string) {
	employee.SuperRole = "Super " + role
}

func main() {
	var (
		user      = User{Name: "Jinzhu", Age: 18, Role: "Admin", Salary: 200000}
		users     = []User{{Name: "Jinzhu", Age: 18, Role: "Admin", Salary: 100000}, {Name: "jinzhu 2", Age: 30, Role: "Dev", Salary: 60000}}
		employee  = Employee{Salary: 150000}
		employees = []Employee{}
	)

	copier.Copy(&employee, &user)

	fmt.Printf("%#v \n", employee)
	// Employee{
	//    Name: "Jinzhu",           // Copy from field
	//    Age: 18,                  // Copy from field
	//    Salary:150000,            // Copying explicitly ignored
	//    DoubleAge: 36,            // Copy from method
	//    EmployeeId: 0,            // Ignored
	//    SuperRole: "Super Admin", // Copy to method
	// }

	// Copy struct to slice
	copier.Copy(&employees, &user)

	fmt.Printf("%#v \n", employees)
	// []Employee{
	//   {Name: "Jinzhu", Age: 18, Salary:0, DoubleAge: 36, EmployeeId: 0, SuperRole: "Super Admin"}
	// }

	// Copy slice to slice
	employees = []Employee{}
	copier.Copy(&employees, &users)

	fmt.Printf("%#v \n", employees)
	// []Employee{
	//   {Name: "Jinzhu", Age: 18, Salary:0, DoubleAge: 36, EmployeeId: 0, SuperRole: "Super Admin"},
	//   {Name: "jinzhu 2", Age: 30, Salary:0, DoubleAge: 60, EmployeeId: 0, SuperRole: "Super Dev"},
	// }

 	// Copy map to map
	map1 := map[int]int{3: 6, 4: 8}
	map2 := map[int32]int8{}
	copier.Copy(&map2, map1)

	fmt.Printf("%#v \n", map2)
	// map[int32]int8{3:6, 4:8}
}

Copy with Option

copier.CopyWithOption(&to, &from, copier.Option{IgnoreEmpty: true, DeepCopy: true})

Contributing

You can help to make the project better, check out http://gorm.io/contribute.html for things you can do.

Author

jinzhu

License

Released under the MIT License.

About

Copier for golang, copy value from struct to struct and more

Resources

License

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published

Languages

  • Go 100.0%