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assigner.go
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assigner.go
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package money
import (
"database/sql/driver"
"reflect"
"github.com/go-aorm/aorm"
)
type MoneyAssigner struct {
Config
NotNull bool
}
func (MoneyAssigner) SelectWrap(_ *aorm.StructField, scope *aorm.Scope, query *aorm.Query) *aorm.Query {
switch scope.Dialect().GetName() {
case "postgres":
query.Query = query.Query // + "::FLOAT8"
}
return query
}
func (MoneyAssigner) DbBindVar(dialect aorm.Dialector, argVar string) string {
switch dialect.GetName() {
case "postgres":
return argVar + "::NUMERIC"
}
return argVar
}
func (this *MoneyAssigner) Valuer(_ aorm.Dialector, value interface{}) driver.Valuer {
return aorm.ValuerFunc(func() (driver.Value, error) {
switch t := value.(type) {
case Money:
if t.IsNil() {
if this.NotNull {
return "0", nil
}
return nil, nil
}
return t.Value()
case *Money:
if t == nil || t.IsNil() {
if this.NotNull {
return "0", nil
}
return nil, nil
}
return t.Value()
default:
return value.(driver.Valuer).Value()
}
})
}
func (MoneyAssigner) Scaner(_ *aorm.Scope, dest *aorm.Field) aorm.Scanner {
return aorm.ScannerFunc(func(src interface{}) (err error) {
if src == nil && dest.Struct.Type.Kind() == reflect.Ptr {
dest.Set(nil)
return nil
}
var m Money
err = m.Scan(src)
dest.Set(m)
return nil
})
}
func (MoneyAssigner) SQLType(*aorm.StructField, aorm.Dialector) (string, string) {
return "NUMERIC", ""
}
func (MoneyAssigner) SQLSize(_ aorm.Dialector) int {
return 0
}
func (MoneyAssigner) Type() reflect.Type {
return reflect.TypeOf(Money{})
}
func (this *MoneyAssigner) ConfigureField(field *aorm.StructField) {
this = &MoneyAssigner{Config: this.Config}
field.AfterRegister(func(field *aorm.StructField) {
field.Assigner = this
field.ScanTags("MONEY", 0, func(flag bool, k, v string) {
if flag {
switch k {
case "POSITIVE":
this.Config.Sig = POSITIVE
case "NEGATIVE":
this.Config.Sig = NEGATIVE
}
}
})
this.NotNull = field.NotNull
if field.TagSettings.Flag("DEFAULT") {
field.DbDefaultValue = true
}
field.PreStore(func(scope *aorm.Scope, field *aorm.Field, v interface{}) (_ interface{}, err error) {
if this.NotNull {
switch t := v.(type) {
case *Money:
if t == nil || t.IsNil() {
v = &aorm.AssignableValue{Assigner: field.Assigner, Val: Zero}
}
case Money:
if t.IsNil() {
v = &aorm.AssignableValue{Assigner: field.Assigner, Val: Zero}
}
}
}
if this.Config.Sig == 0 {
return v, nil
}
switch t := v.(type) {
case *Money:
if !t.IsZero() {
if int(this.Config.Sig) != t.Sign() {
v = t.Neg()
err = field.Set(v)
}
}
case Money:
if !t.IsZero() {
if int(this.Config.Sig) != t.Sign() {
v = t.Neg()
err = field.Set(v)
}
}
}
return v, err
})
})
}
func GetFieldConfig(f *aorm.StructField) *Config {
return &f.Assigner.(*MoneyAssigner).Config
}
func init() {
aorm.Register(&MoneyAssigner{})
}