115 lines
2.1 KiB
Go
115 lines
2.1 KiB
Go
package gorm_test
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import (
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"encoding/json"
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"errors"
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"testing"
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"github.com/kr/pretty"
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)
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type (
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Widget interface {
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GetType() string
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}
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WidgetUser struct {
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User
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WidgetType string
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Widget Widget `gorm:"use_encoder;column:widget;type:text"`
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}
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SimpleWidget struct {
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Type string `json:"type"`
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Width int64 `json:"width"`
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Height int64 `json:"height"`
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}
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ComplexWidget struct {
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SimpleWidget
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Color string `json:"color"`
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}
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)
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func (m *SimpleWidget) GetType() string {
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return "simple"
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}
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func (m *ComplexWidget) GetType() string {
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return "complex"
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}
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func (m *WidgetUser) EncodeField(column string) (interface{}, error) {
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switch column {
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case "widget":
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val, err := json.Marshal(m.Widget)
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if err != nil {
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return nil, err
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}
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return string(val), nil
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}
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return nil, nil
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}
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func (m *WidgetUser) DecodeField(column string, value interface{}) error {
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switch column {
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case "widget":
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b, ok := value.([]byte)
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if !ok {
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return errors.New("Invalid type for Widget")
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}
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switch m.WidgetType {
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case "simple":
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var result SimpleWidget
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if err := json.Unmarshal(b, &result); err != nil {
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return err
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}
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m.Widget = &result
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case "complex":
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var result ComplexWidget
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if err := json.Unmarshal(b, &result); err != nil {
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return err
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}
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m.Widget = &result
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default:
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return errors.New("unsupported Widget type")
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}
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}
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return nil
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}
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func TestEncoder(t *testing.T) {
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user := &WidgetUser{
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User: User{
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Id: 1,
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Name: "bob",
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},
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WidgetType: "simple",
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Widget: &SimpleWidget{Type: "simple", Width: 12, Height: 10},
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}
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if err := DB.Save(user).Error; err != nil {
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t.Errorf("failed to save WidgetUser %v", err)
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}
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user1 := WidgetUser{}
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if err := DB.First(&user1, "id=?", 1).Error; err != nil {
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t.Errorf("failed to retrieve WidgetUser %v", err)
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}
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if user1.Widget.GetType() != "simple" {
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t.Errorf("user widget invalid")
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}
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if w, ok := user1.Widget.(*SimpleWidget); !ok {
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t.Errorf("user widget is not valid")
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} else {
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if w.Width != 12 || w.Height != 10 {
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t.Errorf("user widget is not valid")
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}
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}
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pretty.Log(user1.Widget)
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}
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