Convert db backend to use Gorm, with basis for support

for Mysql and Postgres in addition to existing Sqlite

backend/internal/entity/lists.go

@@ -0,0 +1,36 @@
+package entity
+
+import (
+	"npm/internal/database"
+	"npm/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// ListableModel is a interface for common use
+type ListableModel interface {
+	TableName() string
+}
+
+// ListResponse is the JSON response for users list
+type ListResponse struct {
+	Total  int64          `json:"total"`
+	Offset int            `json:"offset"`
+	Limit  int            `json:"limit"`
+	Sort   []model.Sort   `json:"sort"`
+	Filter []model.Filter `json:"filter,omitempty"`
+	Items  interface{}    `json:"items,omitempty"`
+}
+
+// ListQueryBuilder is used to setup queries for lists
+func ListQueryBuilder(
+	pageInfo *model.PageInfo,
+	defaultSort model.Sort,
+	filters []model.Filter,
+) *gorm.DB {
+	scopes := make([]func(*gorm.DB) *gorm.DB, 0)
+	scopes = append(scopes, ScopeOrderBy(pageInfo, defaultSort))
+	scopes = append(scopes, ScopeOffsetLimit(pageInfo))
+	// scopes = append(scopes, ScopeFilters(GetFilterMap(m)))
+	return database.GetDB().Scopes(scopes...)
+}