https://github.com/hbagdi/convert
https://github.com/hbagdi/convert
Last synced: 4 months ago
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- Host: GitHub
- URL: https://github.com/hbagdi/convert
- Owner: hbagdi
- License: apache-2.0
- Created: 2020-11-06T15:43:51.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2020-11-12T00:33:01.000Z (over 4 years ago)
- Last Synced: 2025-01-06T18:21:31.481Z (5 months ago)
- Language: Go
- Homepage:
- Size: 12.7 KB
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
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README
# convert
[](https://pkg.go.dev/github.com/hbagdi/convert)
[](https://goreportcard.com/report/github.com/hbagdi/convert)
Convert from one type to another.
## Features
- Copy from one struct type to another
- Copy from one field to another field with a different name
- Use custom transformation functions to copy fields of different types
## Usage
```go
package main
import (
"fmt"
"log"
"reflect"
"strconv"
"time"
"github.com/hbagdi/convert"
)
type From struct {
// ID will be copied into To.ID as is.
ID string
// CreatedAt will be copied into To.CreationTime.
// Registered function will be invoked to transform time.Time into int64.
CreatedAt time.Time `convert:"CreationTime"`
// Count will copied into Total field.
// Registered function will be invoked to transform string into int.
Count string `convert:"Total"`
}
type To struct {
ID string
CreationTime int64
Total int
}
func init() {
convert.Register(reflect.TypeOf(time.Time{}), reflect.TypeOf(int64(0)),
func(from interface{}) (interface{}, error) {
t, ok := from.(time.Time)
if !ok {
return 0, nil
}
return t.Unix(), nil
},
)
convert.Register(
reflect.TypeOf(""),
reflect.TypeOf(int(0)),
func(from interface{}) (interface{}, error) {
s, ok := from.(string)
if !ok {
return "", nil
}
return strconv.Atoi(s)
},
)
}
func main() {
f := From{
ID: "some-id",
CreatedAt: time.Date(2030, 1, 1, 0, 0, 0, 0, time.UTC),
Count: "42",
}
var t To
err := convert.Convert(f, &t)
if err != nil {
log.Fatalln("failed to convert:", err)
}
fmt.Printf("From struct: %+v\n", f)
// From struct: {ID:some-id CreatedAt:2030-01-01 00:00:00 +0000 UTC Count:42}
fmt.Printf("To struct: %+v\n", t)
// To struct: {ID:some-id CreationTime:1893456000 Total:42}
}
```
## Changelog
Please read the [CHANGELOG.md](CHANGELOG.md) file.
## Acknowledgement
This package borrows code from [github.com/jinzhu/copier](https://github.com/jinzhu/copier).
## License
convert is licensed with Apache License Version 2.0.
Please read the [LICENSE](LICENSE) file for more details.