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model.go
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model.go
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package orm
import (
"database/sql"
"errors"
"fmt"
"reflect"
"time"
"github.com/go-pg/pg/types"
)
var timeType = reflect.TypeOf((*time.Time)(nil)).Elem()
type useQueryOne interface {
useQueryOne() bool
}
type Model interface {
ColumnScanner
// Reset resets model state.
Reset() error
// NewModel returns ColumnScanner that is used to scan columns
// from the current row.
NewModel() ColumnScanner
// AddModel adds ColumnScanner to the Collection.
AddModel(ColumnScanner) error
AfterQuery(DB) error
AfterSelect(DB) error
BeforeInsert(DB) error
AfterInsert(DB) error
BeforeUpdate(DB) error
AfterUpdate(DB) error
BeforeDelete(DB) error
AfterDelete(DB) error
}
func NewModel(values ...interface{}) (Model, error) {
if len(values) > 1 {
return Scan(values...), nil
}
v0 := values[0]
switch v0 := v0.(type) {
case Model:
return v0, nil
case sql.Scanner:
return Scan(v0), nil
}
v := reflect.ValueOf(v0)
if !v.IsValid() {
return nil, errors.New("pg: Model(nil)")
}
if v.Kind() != reflect.Ptr {
return nil, fmt.Errorf("pg: Model(non-pointer %T)", v0)
}
v = v.Elem()
switch v.Kind() {
case reflect.Struct:
return newStructTableModel(v)
case reflect.Slice:
typ := v.Type()
structType := indirectType(typ.Elem())
if structType.Kind() == reflect.Struct && structType != timeType {
m := sliceTableModel{
structTableModel: structTableModel{
table: Tables.Get(structType),
root: v,
},
slice: v,
}
m.init(typ)
return &m, nil
} else {
return &sliceModel{
slice: v,
scan: types.Scanner(structType),
}, nil
}
}
return Scan(v0), nil
}