feat: crud service

internal/services/greetservice.go

@@ -1,8 +0,0 @@
-package internal
-
-// TODO: implement service and migrator
-type GreetService struct{}
-
-func (g *GreetService) Greet(name string) string {
-	return "Hello " + name + "!"
-}

internal/services/post_service_crud.go

@@ -0,0 +1,52 @@
+package services
+
+import (
+	"app/internal/dal"
+	"app/internal/models"
+	"errors"
+
+	"gorm.io/gen/field"
+	"gorm.io/gorm"
+)
+
+type PostService struct{}
+type Post = models.Post
+
+func (service *PostService) Create(item Post) (Post, error) {
+	err := dal.Post.Preload(field.Associations).Create(&item)
+	return item, err
+}
+
+func (service *PostService) GetAll() ([]*Post, error) {
+	var posts []*Post
+	posts, err := dal.Post.Preload(field.Associations).Find()
+	return posts, err
+}
+
+func (service *PostService) GetById(id uint) (*Post, error) {
+	item, err := dal.Post.Preload(field.Associations).Where(dal.Post.Id.Eq(id)).First()
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		} else {
+			return nil, err
+		}
+	}
+
+	return item, nil
+}
+
+func (service *PostService) Update(item Post) (Post, error) {
+	err := dal.Post.Preload(field.Associations).Save(&item)
+	return item, err
+}
+
+func (service *PostService) Delete(item Post) (Post, error) {
+	_, err := dal.Post.Unscoped().Preload(field.Associations).Delete(&item)
+	return item, err
+}
+
+func (service *PostService) Count() (int64, error) {
+	amount, err := dal.Post.Count()
+	return amount, err
+}