chore:cleaned null-ability usage

server/backend/cafeteriaRatingDBInitializer.go

@@ -1,7 +1,6 @@
 package backend
 
 import (
-	"database/sql"
 	"embed"
 	"encoding/json"
 
@@ -57,7 +56,7 @@ func addEntriesForCronJob(db *gorm.DB, cronName string, interval int32) {
 		errCreate := db.Model(&model.Crontab{}).
 			Create(&model.Crontab{
 				Interval: interval,
-				Type:     null.String{NullString: sql.NullString{String: cronName, Valid: true}},
+				Type:     null.StringFrom(cronName),
 				LastRun:  0,
 			}).Error
 		if errCreate != nil {

server/backend/cron/news.go

@@ -2,7 +2,6 @@ package cron
 
 import (
 	"crypto/md5"
-	"database/sql"
 	"errors"
 	"fmt"
 	"regexp"
@@ -91,7 +90,7 @@ func (c *CronService) parseNewsFeed(source model.NewsSource) error {
 		if !skipNews(existingNewsLinksForSource, item.Link) {
 			// pick the first enclosure that is an image (if any)
 			var pickedEnclosure *gofeed.Enclosure
-			var enclosureUrl = null.String{NullString: sql.NullString{Valid: true, String: ""}}
+			var enclosureUrl = null.StringFrom("")
 			for _, enclosure := range item.Enclosures {
 				if strings.HasSuffix(enclosure.URL, "jpg") ||
 					strings.HasSuffix(enclosure.URL, "jpeg") ||
@@ -101,13 +100,13 @@ func (c *CronService) parseNewsFeed(source model.NewsSource) error {
 					break
 				}
 			}
-			var fileId = null.Int{NullInt64: sql.NullInt64{Valid: false}}
+			var fileId = null.Int{}
 			if pickedEnclosure != nil {
 				fileId, err = c.saveImage(pickedEnclosure.URL)
 				if err != nil {
 					log.WithError(err).Error("can't save news image")
 				}
-				enclosureUrl = null.String{NullString: sql.NullString{String: pickedEnclosure.URL, Valid: true}}
+				enclosureUrl = null.StringFrom(pickedEnclosure.URL)
 			}
 			bm := bluemonday.StrictPolicy()
 			sanitizedDesc := bm.Sanitize(item.Description)
@@ -155,8 +154,8 @@ func (c *CronService) saveImage(url string) (null.Int, error) {
 	file := model.Files{
 		Name:       targetFileName,
 		Path:       ImageDirectory,
-		URL:        sql.NullString{String: url, Valid: true},
-		Downloaded: sql.NullBool{Bool: false, Valid: true},
+		URL:        null.StringFrom(url),
+		Downloaded: null.BoolFrom(false),
 	}
 	err := c.db.Transaction(func(tx *gorm.DB) error {
 		if err := tx.Create(&file).Error; err != nil {
@@ -169,7 +168,7 @@ func (c *CronService) saveImage(url string) (null.Int, error) {
 		return null.Int{}, err
 	}
 	// creating this int is annoying but i'm too afraid to use real ORM in the model
-	return null.Int{NullInt64: sql.NullInt64{Int64: int64(file.File), Valid: true}}, nil
+	return null.IntFrom(int64(file.File)), nil
 }
 
 // skipNews returns true if link is in existingLinks or link is invalid

server/backend/migration/20210709193000.go

@@ -1,8 +1,6 @@
 package migration
 
 import (
-	"database/sql"
-
 	"github.com/TUM-Dev/Campus-Backend/server/model"
 	"github.com/go-gormigrate/gormigrate/v2"
 	"github.com/guregu/null"
@@ -18,8 +16,8 @@ func (m TumDBMigrator) migrate20210709193000() *gormigrate.Migration {
 		ID: "20210709193000",
 		Migrate: func(tx *gorm.DB) error {
 			type Files struct {
-				URL        sql.NullString `gorm:"column:url;default:null;" json:"url"`                         // URL of the file source (if any)
-				Downloaded sql.NullBool   `gorm:"column:downloaded;type:boolean;default:1;" json:"downloaded"` // true when file is ready to be served, false when still being downloaded
+				URL        null.String `gorm:"column:url;default:null;" json:"url"`                         // URL of the file source (if any)
+				Downloaded null.Bool   `gorm:"column:downloaded;type:boolean;default:1;" json:"downloaded"` // true when file is ready to be served, false when still being downloaded
 			}
 			if err := tx.AutoMigrate(
 				&Files{},
@@ -29,7 +27,7 @@ func (m TumDBMigrator) migrate20210709193000() *gormigrate.Migration {
 			}
 			return tx.Create(&model.Crontab{
 				Interval: 300,
-				Type:     null.String{NullString: sql.NullString{String: "fileDownload", Valid: true}},
+				Type:     null.StringFrom("fileDownload"),
 			}).Error
 		},
 		Rollback: func(tx *gorm.DB) error {

server/backend/migration/20221119131300.go

@@ -1,7 +1,6 @@
 package migration
 
 import (
-	"database/sql"
 	_ "embed"
 	"encoding/json"
 
@@ -53,7 +52,7 @@ func (m TumDBMigrator) migrate20221119131300() *gormigrate.Migration {
 
 			err := tx.Create(&model.Crontab{
 				Interval: 60,
-				Type:     null.String{NullString: sql.NullString{String: cron.IOSNotifications, Valid: true}},
+				Type:     null.StringFrom(cron.IOSNotifications),
 			}).Error
 
 			if err != nil {
@@ -62,12 +61,7 @@ func (m TumDBMigrator) migrate20221119131300() *gormigrate.Migration {
 			}
 
 			return tx.Create(&model.Crontab{
-				Type: null.String{
-					NullString: sql.NullString{
-						String: cron.IOSActivityReset,
-						Valid:  true,
-					},
-				},
+				Type:     null.StringFrom(cron.IOSActivityReset),
 				Interval: 86400,
 			}).Error
 		},

server/backend/migration/20221210000000.go

@@ -1,8 +1,6 @@
 package migration
 
 import (
-	"database/sql"
-
 	"github.com/TUM-Dev/Campus-Backend/server/model"
 	"github.com/go-gormigrate/gormigrate/v2"
 	"github.com/guregu/null"
@@ -30,7 +28,7 @@ func (m TumDBMigrator) migrate20221210000000() *gormigrate.Migration {
 
 			return tx.Create(&model.Crontab{
 				Interval: 60 * 5, // Every 5 minutes
-				Type:     null.String{NullString: sql.NullString{String: "canteenHeadCount", Valid: true}},
+				Type:     null.StringFrom("canteenHeadCount"),
 			}).Error
 		},
 

server/backend/migration/20230825000000.go

@@ -1,8 +1,6 @@
 package migration
 
 import (
-	"database/sql"
-
 	"github.com/TUM-Dev/Campus-Backend/server/model"
 	"github.com/go-gormigrate/gormigrate/v2"
 	"github.com/guregu/null"
@@ -26,7 +24,7 @@ func (m TumDBMigrator) migrate20230825000000() *gormigrate.Migration {
 			}
 			return tx.Create(&model.Crontab{
 				Interval: 60 * 10, // Every 10 minutes
-				Type:     null.String{NullString: sql.NullString{String: "chat", Valid: true}},
+				Type:     null.StringFrom("chat"),
 			}).Error
 		},
 	}

server/backend/migration/20230904000000.go

@@ -1,8 +1,6 @@
 package migration
 
 import (
-	"database/sql"
-
 	"github.com/TUM-Dev/Campus-Backend/server/model"
 	"github.com/go-gormigrate/gormigrate/v2"
 	"github.com/guregu/null"
@@ -31,7 +29,7 @@ func (m TumDBMigrator) migrate20230904000000() *gormigrate.Migration {
 			}
 			return tx.Create(&model.Crontab{
 				Interval: 60 * 10, // Every 10 minutes
-				Type:     null.String{NullString: sql.NullString{String: "ticketsales", Valid: true}},
+				Type:     null.StringFrom("ticketsales"),
 			}).Error
 		},
 	}

server/backend/newsAlerts_test.go

@@ -60,11 +60,11 @@ func (s *NewsAlertSuite) Test_GetTopNewsOne() {
 			Name:       "Tournament_app_02-02.png",
 			Path:       "newsalerts/",
 			Downloads:  0,
-			URL:        sql.NullString{Valid: false},
-			Downloaded: sql.NullBool{Bool: true, Valid: true},
+			URL:        null.String{},
+			Downloaded: null.Bool{},
 		},
-		Name:    null.String{NullString: sql.NullString{String: "Exzellenzuniversität", Valid: true}},
-		Link:    null.String{NullString: sql.NullString{String: "https://tum.de", Valid: true}},
+		Name:    null.StringFrom("Exzellenzuniversität"),
+		Link:    null.StringFrom("https://tum.de"),
 		Created: time.Time.Add(time.Now(), time.Hour*-4),
 		From:    time.Time.Add(time.Now(), time.Hour*-2),
 		To:      time.Time.Add(time.Now(), time.Hour*2),

server/backend/news_test.go

@@ -52,30 +52,30 @@ func file(id int32) *model.Files {
 		Name:       fmt.Sprintf("src_%d.png", id),
 		Path:       "news/sources",
 		Downloads:  1,
-		URL:        sql.NullString{Valid: false},
-		Downloaded: sql.NullBool{Bool: true, Valid: true},
+		URL:        null.String{},
+		Downloaded: null.BoolFrom(true),
 	}
 }
 
 func source1() *model.NewsSource {
 	return &model.NewsSource{
 		Source:  1,
 		Title:   "Amazing News 1",
-		URL:     null.String{NullString: sql.NullString{String: "https://example.com/amazing1", Valid: true}},
+		URL:     null.StringFrom("https://example.com/amazing1"),
 		FilesID: file(2).File,
 		Files:   *file(2),
-		Hook:    null.String{NullString: sql.NullString{String: "", Valid: true}},
+		Hook:    null.StringFrom(""),
 	}
 }
 
 func source2() *model.NewsSource {
 	return &model.NewsSource{
 		Source:  2,
 		Title:   "Amazing News 2",
-		URL:     null.String{NullString: sql.NullString{String: "https://example.com/amazing2", Valid: true}},
+		URL:     null.StringFrom("https://example.com/amazing2"),
 		FilesID: file(2).File,
 		Files:   *file(2),
-		Hook:    null.String{NullString: sql.NullString{String: "hook", Valid: true}},
+		Hook:    null.StringFrom("hook"),
 	}
 }
 

server/model/files.go

@@ -17,12 +17,12 @@ var (
 
 // Files struct is a row record of the files table in the tca database
 type Files struct {
-	File       int32          `gorm:"primary_key;AUTO_INCREMENT;column:file;type:int;" json:"file"`
-	Name       string         `gorm:"column:name;type:text;size:16777215;" json:"name"`
-	Path       string         `gorm:"column:path;type:text;size:16777215;" json:"path"`
-	Downloads  int32          `gorm:"column:downloads;type:int;default:0;" json:"downloads"`
-	URL        sql.NullString `gorm:"column:url;default:null;" json:"url"`                         // URL of the files source (if any)
-	Downloaded sql.NullBool   `gorm:"column:downloaded;type:boolean;default:1;" json:"downloaded"` // true when file is ready to be served, false when still being downloaded
+	File       int32       `gorm:"primary_key;AUTO_INCREMENT;column:file;type:int;" json:"file"`
+	Name       string      `gorm:"column:name;type:text;size:16777215;" json:"name"`
+	Path       string      `gorm:"column:path;type:text;size:16777215;" json:"path"`
+	Downloads  int32       `gorm:"column:downloads;type:int;default:0;" json:"downloads"`
+	URL        null.String `gorm:"column:url;default:null;" json:"url"`                         // URL of the files source (if any)
+	Downloaded null.Bool   `gorm:"column:downloaded;type:boolean;default:1;" json:"downloaded"` // true when file is ready to be served, false when still being downloaded
 }
 
 // TableName sets the insert table name for this struct type

server/model/iosDeviceLastUpdated.go

@@ -1,16 +1,17 @@
 package model
 
 import (
-	"database/sql"
 	"fmt"
+
+	"github.com/guregu/null"
 )
 
 // IOSDeviceLastUpdated used as a result of a query that joins
 // IOSDevice and IOSDeviceRequestLog tables.
 type IOSDeviceLastUpdated struct {
-	DeviceID    string       `json:"deviceId"`
-	LastUpdated sql.NullTime `json:"lastUpdated"`
-	PublicKey   string       `json:"publicKey"`
+	DeviceID    string    `json:"deviceId"`
+	LastUpdated null.Time `json:"lastUpdated"`
+	PublicKey   string    `json:"publicKey"`
 }
 
 func (device *IOSDeviceLastUpdated) String() string {