refactor: interfaced the category services

pkg/controller/category/category.go

@@ -16,10 +16,12 @@ type Controller struct {
 	Validator *validator.Validate
 	Logger    *utility.Logger
 	ExtReq    request.ExternalRequest
+	CategoryService category.CategoryService
 }
 
 func (base *Controller) GetCategoryNames(c *gin.Context) {
-	categories, code, err := category.GetCategoryNames(base.Db.Postgresql.DB(), c)
+
+	categories, code, err := base.CategoryService.GetCategoryNames(c)
 	if err != nil {
 		rd := utility.BuildErrorResponse(http.StatusBadRequest, "error", err.Error(), err, nil)
 		c.JSON(http.StatusBadRequest, rd)

pkg/router/category.go

@@ -9,12 +9,14 @@ import (
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/controller/category"
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/middleware"
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/repository/storage"
+	categoryServices "github.com/hngprojects/hng_boilerplate_golang_web/services/category"
 	"github.com/hngprojects/hng_boilerplate_golang_web/utility"
 )
 
 func Category(r *gin.Engine, ApiVersion string, validator *validator.Validate, db *storage.Database, logger *utility.Logger) *gin.Engine {
 	extReq := request.ExternalRequest{Logger: logger, Test: false}
-	category := category.Controller{Db: db, Validator: validator, Logger: logger, ExtReq: extReq}
+	categoryService := categoryServices.NewCategoryService(db.Postgresql.DB())
+	category := category.Controller{Db: db, Validator: validator, Logger: logger, ExtReq: extReq, CategoryService: categoryService}
 
 	categoryUrl := r.Group(fmt.Sprintf("%v", ApiVersion), middleware.Authorize(db.Postgresql.DB()))
 	{

services/category/category.go

@@ -21,10 +21,26 @@ type PaginatedResponse struct {
 	PageSize   int        `json:"pageSize"`
 }
 
-func GetCategoryNames(db *gorm.DB, ctx *gin.Context) (*PaginatedResponse, int, error) {
+// CategoryService defines the interface for category operations
+type CategoryService interface {
+	GetCategoryNames(ctx *gin.Context) (*PaginatedResponse, int, error)
+}
+
+// categoryService implements CategoryService
+type categoryService struct {
+	db *gorm.DB
+}
+
+// NewCategoryService initializes a new CategoryService instance
+func NewCategoryService(db *gorm.DB) CategoryService {
+	return &categoryService{db: db}
+}
+
+// GetCategoryNames fetches paginated category names
+func (s *categoryService) GetCategoryNames(ctx *gin.Context) (*PaginatedResponse, int, error) {
 	ownerID, _ := middleware.GetIdFromToken(ctx)
 	if ownerID == "" {
-		return nil, http.StatusUnauthorized, errors.New("Unauthorized access")
+		return nil, http.StatusUnauthorized, errors.New("unauthorized access")
 	}
 
 	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
@@ -40,7 +56,7 @@ func GetCategoryNames(db *gorm.DB, ctx *gin.Context) (*PaginatedResponse, int, e
 	var categories []Category
 	var totalCount int64
 
-	tx := db.Begin()
+	tx := s.db.Begin()
 	defer func() {
 		if r := recover(); r != nil {
 			tx.Rollback()

tests/test_categories/category_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/controller/category"
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/middleware"
 	"github.com/hngprojects/hng_boilerplate_golang_web/pkg/repository/storage"
+	categoryServices "github.com/hngprojects/hng_boilerplate_golang_web/services/category"
 	tst "github.com/hngprojects/hng_boilerplate_golang_web/tests"
 	"github.com/hngprojects/hng_boilerplate_golang_web/utility"
 )
@@ -45,7 +46,8 @@ func TestGetCategoryNames(t *testing.T) {
 	tst.SignupUser(t, r, auth, userSignUpData, false)
 
 	token := tst.GetLoginToken(t, r, auth, loginData)
-	category := category.Controller{Db: db, Validator: validatorRef, Logger: logger}
+	categoryService := categoryServices.NewCategoryService(db.Postgresql.DB())
+	category := category.Controller{Db: db, Validator: validatorRef, Logger: logger, CategoryService: categoryService}
 
 	r = gin.Default()