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pk.go
57 lines (53 loc) · 968 Bytes
/
pk.go
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package db
import (
"errors"
"reflect"
"strings"
"github.com/serenize/snaker"
)
func PkName(model any) (name string, err error) {
fail := func(reason string) {
err = errors.New("pk name fail: " + reason)
}
rt := reflect.TypeOf(model)
if rt.Kind() != reflect.Pointer {
fail("model is not pointer")
return
}
rt = rt.Elem()
if rt.Kind() != reflect.Struct {
fail("model is not struct")
return
}
name = pkName(rt)
if name == "" {
fail("it not found")
}
return
}
func pkName(rt reflect.Type) (name string) {
for i := 0; i < rt.NumField(); i++ {
f := rt.Field(i)
if f.Anonymous && f.Type.Kind() == reflect.Struct {
name = pkName(f.Type)
if name != "" {
return
}
continue
}
s := strings.Split(f.Tag.Get("bun"), ",")
if len(s) > 1 {
name = s[0]
s = s[1:]
for _, tag := range s {
if tag == "pk" {
if name == "" {
name = snaker.CamelToSnake(f.Name)
}
return
}
}
}
}
return
}