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models_utils.go
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models_utils.go
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// Copyright 2019 asana Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package orm
import (
"database/sql"
"fmt"
"reflect"
"strings"
"time"
)
// 1 is attr
// 2 is tag
var supportTag = map[string]int{
"-": 1,
"null": 1,
"index": 1,
"unique": 1,
"pk": 1,
"auto": 1,
"auto_now": 1,
"auto_now_add": 1,
"size": 2,
"column": 2,
"default": 2,
"rel": 2,
"reverse": 2,
"rel_table": 2,
"rel_through": 2,
"digits": 2,
"decimals": 2,
"on_delete": 2,
"type": 2,
"description": 2,
}
// get reflect.Type name with package path.
func getFullName(typ reflect.Type) string {
return typ.PkgPath() + "." + typ.Name()
}
// getTableName get struct table name.
// If the struct implement the TableName, then get the result as tablename
// else use the struct name which will apply snakeString.
func getTableName(val reflect.Value) string {
if fun := val.MethodByName("TableName"); fun.IsValid() {
vals := fun.Call([]reflect.Value{})
// has return and the first val is string
if len(vals) > 0 && vals[0].Kind() == reflect.String {
return vals[0].String()
}
}
return snakeString(reflect.Indirect(val).Type().Name())
}
// get table engine, myisam or innodb.
func getTableEngine(val reflect.Value) string {
fun := val.MethodByName("TableEngine")
if fun.IsValid() {
vals := fun.Call([]reflect.Value{})
if len(vals) > 0 && vals[0].Kind() == reflect.String {
return vals[0].String()
}
}
return ""
}
// get table index from method.
func getTableIndex(val reflect.Value) [][]string {
fun := val.MethodByName("TableIndex")
if fun.IsValid() {
vals := fun.Call([]reflect.Value{})
if len(vals) > 0 && vals[0].CanInterface() {
if d, ok := vals[0].Interface().([][]string); ok {
return d
}
}
}
return nil
}
// get table unique from method
func getTableUnique(val reflect.Value) [][]string {
fun := val.MethodByName("TableUnique")
if fun.IsValid() {
vals := fun.Call([]reflect.Value{})
if len(vals) > 0 && vals[0].CanInterface() {
if d, ok := vals[0].Interface().([][]string); ok {
return d
}
}
}
return nil
}
// get snaked column name
func getColumnName(ft int, _ reflect.Value, sf reflect.StructField, col string) string {
column := col
if col == "" {
column = nameStrategyMap[nameStrategy](sf.Name)
}
switch ft {
case RelForeignKey, RelOneToOne:
if len(col) == 0 {
column = column + "_id"
}
case RelManyToMany, RelReverseMany, RelReverseOne:
column = sf.Name
}
return column
}
// return field type as type constant from reflect.Value
func getFieldType(val reflect.Value) (ft int, err error) {
switch val.Type() {
case reflect.TypeOf(new(int8)):
ft = TypeBitField
case reflect.TypeOf(new(int16)):
ft = TypeSmallIntegerField
case reflect.TypeOf(new(int32)),
reflect.TypeOf(new(int)):
ft = TypeIntegerField
case reflect.TypeOf(new(int64)):
ft = TypeBigIntegerField
case reflect.TypeOf(new(uint8)):
ft = TypePositiveBitField
case reflect.TypeOf(new(uint16)):
ft = TypePositiveSmallIntegerField
case reflect.TypeOf(new(uint32)),
reflect.TypeOf(new(uint)):
ft = TypePositiveIntegerField
case reflect.TypeOf(new(uint64)):
ft = TypePositiveBigIntegerField
case reflect.TypeOf(new(float32)),
reflect.TypeOf(new(float64)):
ft = TypeFloatField
case reflect.TypeOf(new(bool)):
ft = TypeBooleanField
case reflect.TypeOf(new(string)):
ft = TypeVarCharField
case reflect.TypeOf(new(time.Time)):
ft = TypeDateTimeField
default:
elm := reflect.Indirect(val)
switch elm.Kind() {
case reflect.Int8:
ft = TypeBitField
case reflect.Int16:
ft = TypeSmallIntegerField
case reflect.Int32, reflect.Int:
ft = TypeIntegerField
case reflect.Int64:
ft = TypeBigIntegerField
case reflect.Uint8:
ft = TypePositiveBitField
case reflect.Uint16:
ft = TypePositiveSmallIntegerField
case reflect.Uint32, reflect.Uint:
ft = TypePositiveIntegerField
case reflect.Uint64:
ft = TypePositiveBigIntegerField
case reflect.Float32, reflect.Float64:
ft = TypeFloatField
case reflect.Bool:
ft = TypeBooleanField
case reflect.String:
ft = TypeVarCharField
default:
if elm.Interface() == nil {
panic(fmt.Errorf("%s is nil pointer, may be miss setting tag", val))
}
switch elm.Interface().(type) {
case sql.NullInt64:
ft = TypeBigIntegerField
case sql.NullFloat64:
ft = TypeFloatField
case sql.NullBool:
ft = TypeBooleanField
case sql.NullString:
ft = TypeVarCharField
case time.Time:
ft = TypeDateTimeField
}
}
}
if ft&IsFieldType == 0 {
err = fmt.Errorf("unsupport field type %s, may be miss setting tag", val)
}
return
}
// parse struct tag string
func parseStructTag(data string) (attrs map[string]bool, tags map[string]string) {
attrs = make(map[string]bool)
tags = make(map[string]string)
for _, v := range strings.Split(data, defaultStructTagDelim) {
if v == "" {
continue
}
v = strings.TrimSpace(v)
if t := strings.ToLower(v); supportTag[t] == 1 {
attrs[t] = true
} else if i := strings.Index(v, "("); i > 0 && strings.Index(v, ")") == len(v)-1 {
name := t[:i]
if supportTag[name] == 2 {
v = v[i+1 : len(v)-1]
tags[name] = v
}
} else {
DebugLog.Println("unsupport orm tag", v)
}
}
return
}