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

Overview

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

	// 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

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.

Comments
  • fix:sql.NullInt32 to int32 and sql.NullByte to byte error

    fix:sql.NullInt32 to int32 and sql.NullByte to byte error

    type A struct {
    	Id sql.NullInt32
    }
    
    type B struct {
    	Id int32
    }
    
    func main() {
    	var a A
    	var b B
    	a = A{Id: sql.NullInt32{Int32: 233, Valid: true}}
    	_ = copier.Copy(&b, a)
    	fmt.Println(a)
    	fmt.Println(b)
    }
    

    the code output is。b.Id not set value

    {{233 true}}
    {0}
    

    Because the value method of sql.NullInt32will convert int32 to Int64。sql.NullInt16 and sql.NullByte are the same

    func (n NullInt32) Value() (driver.Value, error) {
    	if !n.Valid {
    		return nil, nil
    	}
    	return int64(n.Int32), nil
    }
    

    It is false to judge whether the value can be assigned

     if rv.Type().AssignableTo(to.Type()) {
    			to.Set(rv)
    		}
    

    So I added a judgment. If the data is of type int, first convert it to the corresponding type for assignment

    if strings.HasPrefix(rv.Type().String(), "int") && (strings.HasPrefix(to.Type().String(), "int") || strings.HasPrefix(to.Type().String(), "uint")) {
    			convert := rv.Convert(to.Type())
    			to.Set(convert)
    		} else if rv.Type().AssignableTo(to.Type()) {
    			to.Set(rv)
    		}
    
    opened by jiang4869 7
  • [Bug] Copy time.Time not working

    [Bug] Copy time.Time not working

    Reproducible Example

    https://play.golang.org/p/pbA2Z1XJotV

    Description

    Hi everyone,

    I'm not abble to copy structure of type time.Time. See the example above.

    Thanks in advance @jinzhu @math-nao

    opened by maeglindeveloper 7
  • Nested Slice getting copied by reference.

    Nested Slice getting copied by reference.

    Issue demonstrated in following code snippet.

    package main
    
    import (
    	"fmt"
    	"github.com/jinzhu/copier"
    )
    
    type A struct {
    	X []int
    }
    
    type B struct {
    	X []int
    }
    
    func main() {
    	x := []int{1, 50}
    	a := A{X: x}
    	b := B{}
    	copier.Copy(&b, a)
    	fmt.Printf("X0 in B %v %v\n", b.X[0], b.X[1]) // Returns 1
    	fmt.Printf("X0 in A %v %v\n", a.X[0], a.X[1]) // Returns 1
    	a.X[0] = -1
    	a.X[1] = -50
    	fmt.Printf("X in B %v %v\n", b.X[0], b.X[1]) // Returns -1
    	fmt.Printf("X in A %v %v\n", a.X[0], a.X[1]) // Returns -1
    }
    
    
    opened by bhupkasUber 7
  • Copy with nested pointer to struct causes panic

    Copy with nested pointer to struct causes panic

    The following code causes a panic:

    package main
    
    import "github.com/jinzhu/copier"
    
    func main() {
    	type nested struct {
    		A string
    	}
    	type parentA struct {
    		*nested
    	}
    	type parentB struct {
    		*nested
    	}
    	a := parentA{nested: &nested{A: "a"}}
    	b := parentB{}
    
    	copier.Copy(&b, &a)
    }
    
    

    stack trace:

    $ go run copier_panic.go
    panic: reflect: indirection through nil pointer to embedded struct
    
    goroutine 1 [running]:
    reflect.Value.FieldByIndex(0x4d4fe0, 0xc04206e020, 0x199, 0xc0420500d0, 0x2, 0x2, 0x0, 0x568f40, 0x4c8a00)
            C:/tools/go/src/reflect/value.go:804 +0x276
    reflect.Value.FieldByName(0x4d4fe0, 0xc04206e020, 0x199, 0x4b5ea6, 0x1, 0x4c8a00, 0xc042044250, 0x198)
            C:/tools/go/src/reflect/value.go:820 +0x16e
    github.com/jinzhu/copier.Copy(0x4c2a60, 0xc04206e020, 0x4c2a20, 0xc04206e018, 0x0, 0x0)
            E:/workspace/golang/src/github.com/jinzhu/copier/copier.go:71 +0x491
    main.main()
            E:/workspace/golang/src/playground/copier_panic.go:18 +0xb1
    exit status 2
    

    The issue originates from this: https://github.com/jinzhu/copier/blob/db4671f3a9b8df855e993f7c94ec5ef1ffb0a23b/copier.go#L71

    Is this something that can be fixed in copier? I don't know enough about reflection but if you can guide me, I can make a PR to fix this.

    opened by sudo-suhas 7
  • [Bug] Panic on SetMapIndex when using map[x]interface{}

    [Bug] Panic on SetMapIndex when using map[x]interface{}

    Reproducible Example

    https://play.golang.org/p/RJOgBhY1oGo

    Description

    Hi everyone,

    I'm facing again a panic using the CopyWithOptions() method. See above the example.

    It seems this is related to map[x]interface{} @jinzhu

    opened by maeglindeveloper 4
  • [Bug] crashed with nested struct

    [Bug] crashed with nested struct

    Reproducible Example

    https://play.golang.org/p/INvrWLUd6BD

    code samples

    package main
    
    import (
    	"github.com/jinzhu/copier"
    )
    
    func main() {
    	type Basic struct {
    		ID   int
    		Name string
    		Addr string
    	}
    
    	type S struct {
    		Basic
    		Level int
    	}
    
    	s1 := S{}
    
    	var s2 S
    	copier.Copy(&s2, s1)
    
    }
    
    

    Description

    Crashed with nested struct. seemed cause by copier.go+193.

    if f, ok := dest.Type().FieldByName(name); ok {
    for idx, x := range f.Index {
    	destFieldKind := dest.Field(x).Kind()
    

    as mentioned by: https://golang.org/pkg/reflect/#StructField

    " Index []int // index sequence for Type.FieldByIndex ", the index can't used by dest.Field(x)

    opened by tubzby 4
  • Full support sql.Null* structs on both sides. Copy to Scanner interface and from Valuer interface.

    Full support sql.Null* structs on both sides. Copy to Scanner interface and from Valuer interface.

    Right copy of:

    sql.Null* -> generic types

    • sql.NullString -> string
    • sql.NullTime -> time.Time
    • etc...

    sql.Null* -> ptr to generic types

    • sql.NullString -> *string
    • etc...

    Or vice versa:

    generic types -> sql.Null*

    • string -> sql.NullString
    • time.Time -> sql.NullTime
    • etc...

    ptr to generic types -> sql.Null*

    • *string -> sql.NullString
    • *time.Time -> sql.NullTime
    • etc...

    Totally covered by tests.

    opened by timsolov 4
  • Copy map with slice-type value panic

    Copy map with slice-type value panic

    Reproducible Example

    fromMap := make(map[string][]int32)
    slice := []int32{1, 2}
    fromMap["key1"] = slice
    toMap := make(map[string][]int32)
    copier.Copy(&toMap, fromMap)
    

    Description

    copy a map which has slice-type value will report error: reflect.Value.Addr of unaddressable value

    opened by studentliying 3
  • Copy un-exported struct fields in DeepCopy

    Copy un-exported struct fields in DeepCopy

    This should fix issues #97 and #98. Like PR #105, it is not specific to time.Time, but resolves the issue by ensuring un-exported fields of a struct are copied, even when DeepCopy: true.

    The idea was inspired by PR #105, but the structure is quite different. PR #105 did not resolve the issue I faced or make tests pass. This PR does both.

    I retained the tests added by PRs #103 and #105 and added a few more cases that exhibit the specific issue I faced.

    opened by joshhardy 3
  • <feat>: add CopyByTag  extend

    : add CopyByTag extend

    copy field by specifying a tag. This will make field type conversion very easy. Allows to copy fields of different types even with different names.

    example

    type structSameName1Tag struct {
    	Aa string    `mson:"A_string"`
    	B int64     `mson:"B_int64"`
    	C time.Time `mson:"C_time_Time"`
    }
    
    type structSameName2Tag struct {
    	A string    `mson:"A_string"`
    	B time.Time `mson:"B_time_Time"`
    	C int64     `mson:"C_int64"`
    }
    
    func (s *structSameName2Tag) C_time_Time(t time.Time){
    	s.C = t.Unix()
    }
    func (s *structSameName2Tag) B_int64(B int64){
    	s.B = time.Unix(B,0)
    }
    func TestCopyFieldsWithSameNameButDifferentTypesTag(t *testing.T) {
    	obj1 := structSameName1Tag{Aa: "123", B: 2, C: time.Now()}
    	obj2 := &structSameName2Tag{}
    	err := copier.CopyByTag(obj2, &obj1,"mson")
    	if err != nil {
    		t.Error("Should not raise error")
    	}
    
    	if obj2.A != obj1.Aa {
    		t.Errorf("Field A should be copied")
    	}
    	if obj2.B.Unix() != obj1.B{
    		t.Errorf("Field B should be copied")
    	}
    	if obj2.C != obj1.C.Unix(){
    		t.Errorf("Field C should be copied")
    	}
    }
    
    opened by ybzhanghx 3
  • fix copy same struct with pointer fields

    fix copy same struct with pointer fields

    fix a bug, when we're copying the same struct which has pointer fields, we'll get the same address of pointer field on original and new one after copy. After this fix, it will be ok!

    opened by hothero 3
  • 在两个含有 map[string]int 的结构体复制后,新对象改动,会影响原`src`内的map

    在两个含有 map[string]int 的结构体复制后,新对象改动,会影响原`src`内的map

    Reproducible Example

    有两个变量都是同一种结构体类型,结构体内有 map,slice,和子结构体。在调用 copier.Copy 复制后,改变 dst 对象内的 map,居然对原 scr 里面的 map 产生了影响,我的预期是复制后,就是彼此独立的对象和map了。

    Description

    测试代码:

    package main
    
    import (
        "fmt"
        "github.com/davecgh/go-spew/spew"
        "github.com/jinzhu/copier"
    )
    
    type SC struct {
        C uint8
    }
    
    type Map1 struct {
        M map[string]int32
        C *SC
    }
    
    func TestCopier() {
        var src = Map1{map[string]int32{"C:": 3, "d": 4}, []int32{9, 8}, &SC{32}}
        var dst1 = Map1{}
        copier.Copy(&dst1, src)
        spew.Printf("1. before src %+v\t\tdst1 %+v\n", src, dst1)
        fmt.Printf("1. before src.map %p\tdst1 %p\n", &src.M, &dst1.M)
        dst1.M["F"] = 5
        dst1.M["g"] = 6
        dst1.A[0] = 7
        dst1.C.C = 27
        spew.Printf("1. after  src %+v\tdst1 %+v\n", src, dst1)
        fmt.Printf("1. after  src.map %p\tdst1 %p\n\n", &src.M, &dst1.M)
    
        var dst2 = Map1{}
        copier.Copy(&dst2, src)
        spew.Printf("2. before src %+v\t\tdst1 %+v\t\t\tdst2 %+v\n", src, dst1, dst2)
        fmt.Printf("2. before src.map %p\tdst1 %p\tdst2 %p\n", &src.M, &dst1.M, &dst2.M)
        dst2.M["H"] = 7
        dst2.M["i"] = 8
        dst1.A[0] = 6
        dst1.C.C = 62
        spew.Printf("2. after  src %+v\tdst1 %+v\t\tdst2 %+v\n", src, dst1, dst2)
        fmt.Printf("2. after  src.map %p\t dst1.map %p\t dst2.map %p\n\n", &src.M, &dst1.M, &dst2.M)
    
        var dst3 = Map1{}
        src.M = map[string]int32{"C:": 3, "d": 4}
        copier.Copy(&dst3, src)
        spew.Printf("3. before src %+v\t\tdst1 %+v\t\t\tdst3 %+v\n", src, dst1, dst3)
        fmt.Printf("3. before src.map %p\tdst1 %p\tdst2 %p\tdst3.map %p\n", &src.M, &dst1.M, &dst1.M, &dst3.M)
        dst3.M["H"] = 7
        dst3.M["i"] = 8
        dst1.A[0] = 5
        dst1.C.C = 57
        spew.Printf("3. after  src %+v\tdst1 %+v\t\tdst3 %+v\n", src, dst1, dst3)
        fmt.Printf("3. after  src.map %p\t dst1.map %p\t dst2.map %p\tdst3.map %p\n\n",
            &src.M, &dst1.M, &dst2.M, &dst3.M)
    }
    

    运行输出:

    1. before src {M:map[C::3 d:4] A:[9 8] C:<*>(0xc000018278){C:32}}		dst1 {M:map[C::3 d:4] A:[9 8] C:<*>(0xc000018308){C:32}}
    1. before src.map 0xc0000643c0	dst1 0xc000064420
    1. after  src {M:map[g:6 C::3 d:4 F:5] A:[7 8] C:<*>(0xc000018278){C:32}}	dst1 {M:map[F:5 g:6 C::3 d:4] A:[7 8] C:<*>(0xc000018308){C:27}}
    1. after  src.map 0xc0000643c0	dst1 0xc000064420
    
    2. before src {M:map[g:6 C::3 d:4 F:5] A:[7 8] C:<*>(0xc000018278){C:32}}		dst1 {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc000018308){C:27}}			dst2 {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc0000186a0){C:32}}
    2. after  src {M:map[C::3 d:4 F:5 g:6 H:7 i:8] A:[6 8] C:<*>(0xc000018278){C:32}}	dst1 {M:map[C::3 d:4 F:5 g:6 H:7 i:8] A:[6 8] C:<*>(0xc000018308){C:62}}		dst2 {M:map[C::3 d:4 F:5 g:6 H:7 i:8] A:[6 8] C:<*>(0xc0000186a0){C:32}}
    2. after  src.map 0xc0000643c0	 dst1.map 0xc000064420	 dst2.map 0xc000064780
    
    3. before src {M:map[C::3 d:4] A:[6 8] C:<*>(0xc000018278){C:32}}		dst1 {M:map[g:6 H:7 i:8 C::3 d:4 F:5] A:[6 8] C:<*>(0xc000018308){C:62}}			dst3 {M:map[C::3 d:4] A:[6 8] C:<*>(0xc000018cc8){C:32}}
    3. after  src {M:map[C::3 d:4 H:7 i:8] A:[5 8] C:<*>(0xc000018278){C:32}}	dst1 {M:map[H:7 i:8 C::3 d:4 F:5 g:6] A:[5 8] C:<*>(0xc000018308){C:57}}		dst3 {M:map[C::3 d:4 H:7 i:8] A:[5 8] C:<*>(0xc000018cc8){C:32}}
    3. after  src.map 0xc0000643c0	 dst1.map 0xc000064420	 dst2.map 0xc000064780	dst3.map 0xc000064ba0
    
    2022/11/12 18:35:51 go-learn end at 2022-11-12 18:35:51.550851 +0800 CST m=+0.000847494 duration is 0 ms
    Pauls-MBP:go-learn paulxu$ go run ./cmd/main.go
    2022/11/12 18:37:21 go-learn start at 2022-11-12 18:37:21.187705 +0800 CST m=+0.000306917
    1. before src {M:map[C::3 d:4] A:[9 8] C:<*>(0xc0000b61e8){C:32}}		dst1 {M:map[C::3 d:4] A:[9 8] C:<*>(0xc0000b6278){C:32}}
    1. before src.map 0xc0000983c0	dst1 0xc000098420
    1. after  src {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc0000b61e8){C:32}}	dst1 {M:map[d:4 F:5 g:6 C::3] A:[7 8] C:<*>(0xc0000b6278){C:27}}
    1. after  src.map 0xc0000983c0	dst1 0xc000098420
    
    2. before src {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc0000b61e8){C:32}}		dst1 {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc0000b6278){C:27}}			dst2 {M:map[d:4 F:5 g:6 C::3] A:[7 8] C:<*>(0xc0000b6610){C:32}}
    2. before src.map 0xc0000983c0	dst1 0xc000098420	dst2 0xc000098780
    2. after  src {M:map[H:7 i:8 C::3 d:4 F:5 g:6] A:[6 8] C:<*>(0xc0000b61e8){C:32}}	dst1 {M:map[g:6 H:7 i:8 C::3 d:4 F:5] A:[6 8] C:<*>(0xc0000b6278){C:62}}		dst2 {M:map[H:7 i:8 C::3 d:4 F:5 g:6] A:[6 8] C:<*>(0xc0000b6610){C:32}}
    2. after  src.map 0xc0000983c0	 dst1.map 0xc000098420	 dst2.map 0xc000098780
    
    3. before src {M:map[C::3 d:4] A:[6 8] C:<*>(0xc0000b61e8){C:32}}		dst1 {M:map[C::3 d:4 F:5 g:6 H:7 i:8] A:[6 8] C:<*>(0xc0000b6278){C:62}}			dst3 {M:map[C::3 d:4] A:[6 8] C:<*>(0xc0000b6c38){C:32}}
    3. before src.map 0xc0000983c0	dst1 0xc000098420	dst2 0xc000098420	dst3.map 0xc000098ba0
    3. after  src {M:map[d:4 H:7 i:8 C::3] A:[5 8] C:<*>(0xc0000b61e8){C:32}}	dst1 {M:map[i:8 C::3 d:4 F:5 g:6 H:7] A:[5 8] C:<*>(0xc0000b6278){C:57}}		dst3 {M:map[i:8 C::3 d:4 H:7] A:[5 8] C:<*>(0xc0000b6c38){C:32}}
    3. after  src.map 0xc0000983c0	 dst1.map 0xc000098420	 dst2.map 0xc000098780	dst3.map 0xc000098ba0
    

    从以上输出 结果看到 src 内的 map 在调用 copier.Copy 方法后,编辑新的dst对象的 map,和子结构体后,src的字结构体不影响,但map也产生了改变。

    我的预期是:在 copy出一个新对象后,对新对象的任何编辑,都不应该影响原对象。

    所以:

    1. 这是个bug
    2. 提问者才疏学浅,这是预期的表现
    3. 使用copier的方式不对
    4. golang限制,做不到提问者的预期
    opened by PaulXu-cn 1
  • 特定场景无法匹配到TypeConverter

    特定场景无法匹配到TypeConverter

    copier 在特定场景无法匹配到TypeConverter, 如下面四种场景, 实际上仅有一个能匹配到.

    type A struct {
    	A int
    }
    
    type B struct {
    	A int
    	b int
    }
    
    func Test_A(t *testing.T) {
    
    	opt := copier.Option{
    		Converters: []copier.TypeConverter{
    			{
    				SrcType: A{},
    				DstType: B{},
    				Fn: func(from interface{}) (interface{}, error) {
    					fmt.Print("match TypeConverter ")
    					return nil, nil
    				},
    			},
    		},
    	}
    
    	{
    		aa := A{A: 10}
    		bb := B{A: 10, b: 100}
    		t.Logf("err: %v", copier.CopyWithOption(&bb, &aa, opt))
    	}
    
    	{
    		aa := map[string]*A{
    			"a": &A{A: 10},
    		}
    
    		bb := map[string]*B{
    			"a": &B{A: 10, b: 100},
    		}
    
    		t.Logf("err: %v", copier.CopyWithOption(&bb, &aa, opt))
    	}
    	{
    		aa := []*A{
    			&A{A: 10},
    		}
    
    		bb := []*B{
    			&B{A: 10, b: 100},
    		}
    
    		t.Logf("err: %v", copier.CopyWithOption(&bb, &aa, opt))
    
    		// b := B{A: 10, b: 100}
    		// dst2 := []*B{&b}
    		// t.Logf("copy a->*b err: %v, b: %+v", copier.CopyWithOption(&dst2, []*A{&a}, opt), b)
    	}
    
    	{
    		aa := struct {
    			A []*A
    		}{
    			A: []*A{&A{A: 10}},
    		}
    
    		bb := struct {
    			A []*B
    		}{
    			A: []*B{&B{A: 10, b: 100}},
    		}
    
    		t.Logf("err: %v", copier.CopyWithOption(&bb, &aa, opt))
    
    		// b := B{A: 10, b: 100}
    		// dst2 := []*B{&b}
    		// t.Logf("copy a->*b err: %v, b: %+v", copier.CopyWithOption(&dst2, []*A{&a}, opt), b)
    	}
    
    }
    
    opened by smzgl 0
  • nopanic Tag无效

    nopanic Tag无效

    Reproducible Example

    copier:"must,nopanic"无法返回错误

    Description

    copier:"must,nopanic" 在未发生拷贝时无法返回错误 copier:"must, nopanic" 在未发生拷贝时可以返回错误 区别逗号后多了一个空格 go version 1.16

    opened by jassls 1
  • Added DefaultSourceFlags option

    Added DefaultSourceFlags option

    Hey Jinzhu! Nice work on the library! I was looking for a way to copy all fields from one nested structure to another while also warning me if any fields are missing in the destination structure. Adding copier tags across many fields would add too much noise. So, I've decided to add a "default flag" option to copier itself. Thought you might find it useful too.

    opened by ekulabuhov 0
Owner
Jinzhu
Life is Art
Jinzhu
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