Improve database compatibility

- Make MediaType case insensitive when saved to database
- Null check exif migrations, this might solve #300

api/database/migration_exif.go

@@ -72,6 +72,16 @@ func migrate_exif_fields_exposure(db *gorm.DB) error {
 
 		return tx.Model(&exifModel{}).Table("media_exif").Where("exposure LIKE '%/%'").FindInBatches(&results, 100, func(tx *gorm.DB, batch int) error {
 			for _, result := range results {
+
+				if result.Exposure == nil {
+					continue
+				}
+
+				if *result.Exposure == "" {
+					result.Exposure = nil
+					continue
+				}
+
 				frac := strings.Split(*result.Exposure, "/")
 				if len(frac) != 2 {
 					return errors.Errorf("failed to convert exposure value (%s) expected format x/y", frac)
@@ -147,6 +157,16 @@ func migrate_exif_fields_flash(db *gorm.DB) error {
 
 		return tx.Model(&exifModel{}).Table("media_exif").Where("flash IS NOT NULL").FindInBatches(&results, 100, func(tx *gorm.DB, batch int) error {
 			for _, result := range results {
+
+				if result.Flash == nil {
+					continue
+				}
+
+				if *result.Flash == "" {
+					result.Flash = nil
+					continue
+				}
+
 				for index, name := range flashDescriptions {
 					if *result.Flash == name {
 						*result.Flash = fmt.Sprintf("%d", index)

api/graphql/models/media.go

@@ -42,6 +42,29 @@ func (m *Media) BeforeSave(tx *gorm.DB) error {
 	// Update path hash
 	m.PathHash = MD5Hash(m.Path)
 
+	// Save media type as lowercase for better compatibility
+	m.Type = MediaType(strings.ToLower(string(m.Type)))
+
+	return nil
+}
+
+func (m *Media) AfterFind(tx *gorm.DB) error {
+
+	// Convert lowercased media type back
+	lowercasedType := strings.ToLower(string(m.Type))
+	foundType := false
+	for _, t := range AllMediaType {
+		if strings.ToLower(string(m.Type)) == lowercasedType {
+			m.Type = t
+			foundType = true
+			break
+		}
+	}
+
+	if foundType == false {
+		return errors.New(fmt.Sprintf("Failed to parse media from DB: Invalid media type: %s", m.Type))
+	}
+
 	return nil
 }
 

ui/src/components/sidebar/MediaSidebar.tsx

@@ -129,7 +129,7 @@ const PreviewMedia = ({ media, previewImage }: PreviewMediaProps) => {
     return <PreviewVideo media={media} />
   }
 
-  throw new Error('Unknown media type')
+  return <div>ERROR: Unknown media type: {media.type}</div>
 }
 
 const Name = styled.div`