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81 lines
1.7 KiB
81 lines
1.7 KiB
package datatypes
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import (
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"context"
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"database/sql/driver"
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"gorm.io/driver/mysql"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/schema"
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)
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// JSONType give a generic data type for json encoded data.
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type JSONType[T any] struct {
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Data T
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}
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// Value return json value, implement driver.Valuer interface
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func (j JSONType[T]) Value() (driver.Value, error) {
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return json.Marshal(j.Data)
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}
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// Scan scan value into JSONType[T], implements sql.Scanner interface
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func (j *JSONType[T]) Scan(value interface{}) error {
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var bytes []byte
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switch v := value.(type) {
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case []byte:
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bytes = v
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case string:
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bytes = []byte(v)
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default:
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return errors.New(fmt.Sprint("Failed to unmarshal JSONB value:", value))
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}
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return json.Unmarshal(bytes, &j.Data)
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}
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// MarshalJSON to output non base64 encoded []byte
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func (j JSONType[T]) MarshalJSON() ([]byte, error) {
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return json.Marshal(j.Data)
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}
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// UnmarshalJSON to deserialize []byte
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func (j *JSONType[T]) UnmarshalJSON(b []byte) error {
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return json.Unmarshal(b, &j.Data)
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}
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// GormDataType gorm common data type
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func (JSONType[T]) GormDataType() string {
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return "json"
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}
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// GormDBDataType gorm db data type
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func (JSONType[T]) GormDBDataType(db *gorm.DB, field *schema.Field) string {
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switch db.Dialector.Name() {
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case "sqlite":
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return "JSON"
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case "mysql":
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return "JSON"
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case "postgres":
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return "JSONB"
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}
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return ""
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}
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func (js JSONType[T]) GormValue(ctx context.Context, db *gorm.DB) clause.Expr {
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data, _ := js.MarshalJSON()
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switch db.Dialector.Name() {
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case "mysql":
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if v, ok := db.Dialector.(*mysql.Dialector); ok && !strings.Contains(v.ServerVersion, "MariaDB") {
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return gorm.Expr("CAST(? AS JSON)", string(data))
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}
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}
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return gorm.Expr("?", string(data))
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}
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