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+# Copier
+
+  I am a copier, I copy everything from one to another
+
+[![test status](https://github.com/jinzhu/copier/workflows/tests/badge.svg?branch=master "test status")](https://github.com/jinzhu/copier/actions)
+
+## 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
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/jinzhu/copier"
+)
+
+type User struct {
+	Name string
+	Role string
+	Age  int32
+
+	// 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
+	EmployeId int64
+	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, EmployeId: 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, EmployeId: 0, SuperRole: "Super Admin"},
+	//   {Name: "jinzhu 2", Age: 30, Salary:0, DoubleAge: 60, EmployeId: 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
+
+```go
+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](http://gorm.io/contribute.html) for things you can do.
+
+# Author
+
+**jinzhu**
+
+* <http://github.com/jinzhu>
+* <wosmvp@gmail.com>
+* <http://twitter.com/zhangjinzhu>
+
+## License
+
+Released under the [MIT License](https://github.com/jinzhu/copier/blob/master/License).