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unmarshaler.go
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/
unmarshaler.go
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package unmarshaler
/**
自动调用解析
在repository中,统一规范字段返解操作
在repository文件中,定义一个Unmarshal函数,在里面写具体里逻辑即可
type Addon struct {
}
func (p *Addon) Unmarshal() {
//for test
p.Addon.Author = p.Addon.Author + "___decode"
}
*/
import (
"reflect"
"github.com/starfork/stargo/store"
"gorm.io/gorm"
)
type Plugin struct {
}
func Register(db *gorm.DB, conf *store.Config) {
p := &Plugin{}
db.Callback().Query().After("gorm:find").Register("unmarshaler_after_query", p.After)
//db.Callback().Create().Before("gorm:create").Register("unmarshaler_after_create", p.Before)
//db.Callback().Update().Before("gorm:update").Register("unmarshaler_after_update", p.Before)
}
// // 接口定义
// type Unmarshaler interface {
// Unmarshal()
// }
func (e *Plugin) After(db *gorm.DB) {
value := db.Statement.ReflectValue
kind := value.Kind()
if kind != reflect.Slice && kind != reflect.Struct {
return
}
if kind == reflect.Slice {
for i := 0; i < value.Len(); i++ {
//非指针类型的不能设置这些东东
if reflect.Value(value.Index(i)).Kind() == reflect.Ptr {
item := reflect.Value(value.Index(i)).Elem()
e.unmarshal(item)
}
}
} else if kind == reflect.Struct {
item := reflect.Value(value)
e.unmarshal(item)
}
}
func (e *Plugin) Before(db *gorm.DB) {
value := db.Statement.ReflectValue
kind := value.Kind()
if kind != reflect.Slice && kind != reflect.Struct {
return
}
if kind == reflect.Slice {
for i := 0; i < value.Len(); i++ {
//非指针类型的不能设置这些东东
if reflect.Value(value.Index(i)).Kind() == reflect.Ptr {
item := reflect.Value(value.Index(i)).Elem()
e.marshal(item)
}
}
} else if kind == reflect.Struct {
item := reflect.Value(value)
e.marshal(item)
}
}
func (e *Plugin) unmarshal(item reflect.Value) {
it := reflect.TypeOf((*interface{ Unmarshal() })(nil)).Elem()
addr := item.Addr()
if addr.Type().Implements(it) {
addr.MethodByName("Unmarshal").Call(nil)
}
}
func (e *Plugin) marshal(item reflect.Value) {
it := reflect.TypeOf((*interface{ Marshal() })(nil)).Elem()
addr := item.Addr()
if addr.Type().Implements(it) {
addr.MethodByName("Marshal").Call(nil)
}
}