copier's Introduction

Copier

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

Features

Copy field to field if name exactly match
Copy from method to field if method name and field name exactly match
Copy from field to method if field name and method name exactly match
Copy slice to slice
Copy struct to slice

Usage

import . "github.com/jinzhu/copier"

type User struct {
	Name string
	Role string
	Age  int32
}

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

type Employee struct {
	Name      string
	Age       int32
	DoubleAge int32
	EmployeId int64
	SuperRule string
}

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

user := User{Name: "Jinzhu", Age: 18, Role: "Admin"}
employee := Employee{}

Copy(&employee, &user)

// employee => Employee{ Name: "Jinzhu",           // Copy from field
//                       Age: 18,                  // Copy from field
//                       DoubleAge: 36,            // Copy from method
//                       EmployeeId: 0,            // Just ignored
//                       SuperRule: "Super Admin", // Copy to method
//                      }

// Copy struct to slice
user := User{Name: "hello", Age: 18, Role: "User"}
employees := []Employee{}
Copy(&employees, &user)
// employees => [{hello 18 0 36 Super User}]


// Copy slice to slice
users := []User{{Name: "Jinzhu", Age: 18, Role: "Admin"}, {Name: "jinzhu 2", Age: 30, Role: "Dev"}}
employees := []Employee{}
Copy(&employees, &users)

// employees => [{hello 18 0 36 Super User} {Jinzhu 18 0 36 Super Admin} {jinzhu 2 30 0 60 Super Dev}]

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