新功能(#74): 新增促销系统模型层

Co-authored-by: multica-agent <github@multica.ai>

internal/model/promo_rule/promo_rule.go

@@ -0,0 +1,73 @@
+package promo_rule
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type JSONRawMessage json.RawMessage
+
+func (j *JSONRawMessage) Scan(value interface{}) error {
+	if value == nil {
+		*j = JSONRawMessage([]byte("{}"))
+		return nil
+	}
+
+	switch v := value.(type) {
+	case []byte:
+		*j = JSONRawMessage(v)
+	case string:
+		*j = JSONRawMessage([]byte(v))
+	default:
+		*j = JSONRawMessage([]byte("{}"))
+	}
+	return nil
+}
+
+func (j JSONRawMessage) Value() (driver.Value, error) {
+	if len(j) == 0 {
+		return "{}", nil
+	}
+	data, err := json.RawMessage(j).MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	return string(data), nil
+}
+
+func (j JSONRawMessage) MarshalJSON() ([]byte, error) {
+	if len(j) == 0 {
+		return []byte("{}"), nil
+	}
+	return json.RawMessage(j).MarshalJSON()
+}
+
+func (j *JSONRawMessage) UnmarshalJSON(data []byte) error {
+	if len(data) == 0 {
+		*j = JSONRawMessage([]byte("{}"))
+		return nil
+	}
+	*j = JSONRawMessage(data)
+	return nil
+}
+
+type PromoRule struct {
+	Id        int64          `gorm:"type:bigint unsigned;primaryKey"`
+	Name      string         `gorm:"type:varchar(100);not null;default:'';comment:Rule Name"`
+	Type      string         `gorm:"type:varchar(32);not null;default:'';comment:Rule Type: new_user, inactive_user, campaign"`
+	Params    JSONRawMessage `gorm:"type:json;not null;comment:Rule Params"`
+	Priority  int64          `gorm:"type:int;not null;default:0;index:idx_enabled_priority,priority:2,sort:desc;comment:Priority"`
+	Enabled   bool           `gorm:"type:tinyint(1);not null;default:1;index:idx_enabled_priority,priority:1;comment:Enabled"`
+	StartTime *time.Time     `gorm:"type:datetime;default:null;comment:Start Time"`
+	EndTime   *time.Time     `gorm:"type:datetime;default:null;comment:End Time"`
+	CreatedAt time.Time      `gorm:"<-:create;comment:Create Time"`
+	UpdatedAt time.Time      `gorm:"comment:Update Time"`
+	DeletedAt gorm.DeletedAt `gorm:"index;comment:Delete Time"`
+}
+
+func (PromoRule) TableName() string {
+	return "promo_rule"
+}