Working version

app/repository/methods.go

@@ -0,0 +1,84 @@
+package repository
+
+import (
+	"errors"
+	"repo-pattern/app/repository/smartfilter"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/schema"
+)
+
+type ListMethod[T schema.Tabler] struct {
+	DbConn *gorm.DB
+}
+
+func (m *ListMethod[T]) Init(dbConn *gorm.DB) {
+	m.DbConn = dbConn
+}
+
+func (m ListMethod[T]) List(filter interface{}) (*[]T, error) {
+	var (
+		model  T
+		models []T
+	)
+
+	query, err := smartfilter.ToQuery(model, filter, m.DbConn)
+	if err != nil {
+		return nil, err
+	}
+
+	query.Find(&models)
+	return &models, nil
+}
+
+type GetMethod[T schema.Tabler] struct {
+	DbConn *gorm.DB
+}
+
+func (m *GetMethod[T]) Init(dbConn *gorm.DB) {
+	m.DbConn = dbConn
+}
+
+func (m GetMethod[T]) Get(filter interface{}) (*T, error) {
+	var (
+		model T
+	)
+
+	query, err := smartfilter.ToQuery(model, filter, m.DbConn)
+	if err != nil {
+		return nil, err
+	}
+
+	result := query.First(&model)
+	if result.Error != nil {
+		return nil, result.Error
+	}
+
+	return &model, nil
+}
+
+type ExistsMethod[T schema.Tabler] struct {
+	DbConn *gorm.DB
+}
+
+func (m *ExistsMethod[T]) Init(dbConn *gorm.DB) {
+	m.DbConn = dbConn
+}
+
+func (m ExistsMethod[T]) Exists(filter interface{}) (bool, error) {
+	var (
+		model T
+	)
+
+	query := m.DbConn.Model(model)
+
+	query, err := smartfilter.ToQuery(model, filter, query)
+	if err != nil {
+		return false, err
+	}
+
+	result := query.Select("*").First(&model)
+
+	exists := !errors.Is(result.Error, gorm.ErrRecordNotFound) && result.Error == nil
+	return exists, nil
+}