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|
package bun
import (
"context"
"database/sql"
"errors"
"fmt"
"reflect"
"time"
"github.com/uptrace/bun/schema"
)
var errNilModel = errors.New("bun: Model(nil)")
var (
timeType = reflect.TypeOf((*time.Time)(nil)).Elem()
bytesType = reflect.TypeOf((*[]byte)(nil)).Elem()
)
type Model = schema.Model
type rowScanner interface {
ScanRow(ctx context.Context, rows *sql.Rows) error
}
type TableModel interface {
Model
schema.BeforeAppendModelHook
schema.BeforeScanRowHook
schema.AfterScanRowHook
ScanColumn(column string, src interface{}) error
Table() *schema.Table
Relation() *schema.Relation
join(string) *relationJoin
getJoin(string) *relationJoin
getJoins() []relationJoin
addJoin(relationJoin) *relationJoin
rootValue() reflect.Value
parentIndex() []int
mount(reflect.Value)
updateSoftDeleteField(time.Time) error
}
func newModel(db *DB, dest []interface{}) (Model, error) {
if len(dest) == 1 {
return _newModel(db, dest[0], true)
}
values := make([]reflect.Value, len(dest))
for i, el := range dest {
v := reflect.ValueOf(el)
if v.Kind() != reflect.Ptr {
return nil, fmt.Errorf("bun: Scan(non-pointer %T)", dest)
}
v = v.Elem()
if v.Kind() != reflect.Slice {
return newScanModel(db, dest), nil
}
values[i] = v
}
return newSliceModel(db, dest, values), nil
}
func newSingleModel(db *DB, dest interface{}) (Model, error) {
return _newModel(db, dest, false)
}
func _newModel(db *DB, dest interface{}, scan bool) (Model, error) {
switch dest := dest.(type) {
case nil:
return nil, errNilModel
case Model:
return dest, nil
case sql.Scanner:
if !scan {
return nil, fmt.Errorf("bun: Model(unsupported %T)", dest)
}
return newScanModel(db, []interface{}{dest}), nil
}
v := reflect.ValueOf(dest)
if !v.IsValid() {
return nil, errNilModel
}
if v.Kind() != reflect.Ptr {
return nil, fmt.Errorf("bun: Model(non-pointer %T)", dest)
}
if v.IsNil() {
typ := v.Type().Elem()
if typ.Kind() == reflect.Struct {
return newStructTableModel(db, dest, db.Table(typ)), nil
}
return nil, fmt.Errorf("bun: Model(nil %s %T)", typ.Kind(), dest)
}
v = v.Elem()
typ := v.Type()
switch typ {
case timeType, bytesType:
return newScanModel(db, []interface{}{dest}), nil
}
switch v.Kind() {
case reflect.Map:
if err := validMap(typ); err != nil {
return nil, err
}
mapPtr := v.Addr().Interface().(*map[string]interface{})
return newMapModel(db, mapPtr), nil
case reflect.Struct:
return newStructTableModelValue(db, dest, v), nil
case reflect.Slice:
switch elemType := sliceElemType(v); elemType.Kind() {
case reflect.Struct:
if elemType != timeType {
return newSliceTableModel(db, dest, v, elemType), nil
}
case reflect.Map:
if err := validMap(elemType); err != nil {
return nil, err
}
slicePtr := v.Addr().Interface().(*[]map[string]interface{})
return newMapSliceModel(db, slicePtr), nil
}
return newSliceModel(db, []interface{}{dest}, []reflect.Value{v}), nil
}
if scan {
return newScanModel(db, []interface{}{dest}), nil
}
return nil, fmt.Errorf("bun: Model(unsupported %T)", dest)
}
func newTableModelIndex(
db *DB,
table *schema.Table,
root reflect.Value,
index []int,
rel *schema.Relation,
) (TableModel, error) {
typ := typeByIndex(table.Type, index)
if typ.Kind() == reflect.Struct {
return &structTableModel{
db: db,
table: table.Dialect().Tables().Get(typ),
rel: rel,
root: root,
index: index,
}, nil
}
if typ.Kind() == reflect.Slice {
structType := indirectType(typ.Elem())
if structType.Kind() == reflect.Struct {
m := sliceTableModel{
structTableModel: structTableModel{
db: db,
table: table.Dialect().Tables().Get(structType),
rel: rel,
root: root,
index: index,
},
}
m.init(typ)
return &m, nil
}
}
return nil, fmt.Errorf("bun: NewModel(%s)", typ)
}
func validMap(typ reflect.Type) error {
if typ.Key().Kind() != reflect.String || typ.Elem().Kind() != reflect.Interface {
return fmt.Errorf("bun: Model(unsupported %s) (expected *map[string]interface{})",
typ)
}
return nil
}
//------------------------------------------------------------------------------
func isSingleRowModel(m Model) bool {
switch m.(type) {
case *mapModel,
*structTableModel,
*scanModel:
return true
default:
return false
}
}
|
