Photo: Update year and month whenever takenAt may change

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

internal/entity/photo.go

@@ -75,6 +75,8 @@ func SavePhotoForm(model Photo, form form.Photo, geoApi string) error {
 		return err
 	}
 
+	model.UpdateYearMonth()
+
 	if form.Description.PhotoID == model.ID {
 		if err := deepcopier.Copy(&model.Description).From(form.Description); err != nil {
 			return err
@@ -122,6 +124,8 @@ func (m *Photo) Save() error {
 	db := Db()
 	labels := m.ClassifyLabels()
 
+	m.UpdateYearMonth()
+
 	if err := m.UpdateTitle(labels); err != nil {
 		log.Warnf("%s (%s)", err.Error(), m.PhotoUUID)
 	}
@@ -485,6 +489,27 @@ func (m *Photo) SetTakenAt(taken, local time.Time, zone, source string) {
 	if zone != "" {
 		m.TimeZone = zone
 	}
+
+	m.UpdateYearMonth()
+}
+
+// UpdateYearMonth updates internal date fields.
+func (m *Photo) UpdateYearMonth() {
+	if m.TakenAt.IsZero() || m.TakenAt.Year() < 1000 {
+		return
+	}
+
+	if m.TakenAtLocal.IsZero() || m.TakenAtLocal.Year() < 1000 {
+		m.TakenAtLocal = m.TakenAt
+	}
+
+	if m.TakenSrc == SrcAuto {
+		m.PhotoYear = YearUnknown
+		m.PhotoMonth = MonthUnknown
+	} else {
+		m.PhotoYear = m.TakenAtLocal.Year()
+		m.PhotoMonth = int(m.TakenAtLocal.Month())
+	}
 }
 
 // SetCoordinates changes the photo lat, lng and altitude if not empty and from the same source.

internal/photoprism/index_mediafile.go

@@ -279,13 +279,7 @@ func (ind *Index) MediaFile(m *MediaFile, o IndexOptions, originalName string) (
 		photo.PhotoCountry = entity.UnknownPlace.CountryCode()
 	}
 
-	if photo.TakenSrc == entity.SrcAuto {
-		photo.PhotoYear = entity.YearUnknown
-		photo.PhotoMonth = entity.MonthUnknown
-	} else if !photo.TakenAtLocal.IsZero() {
-		photo.PhotoYear = photo.TakenAtLocal.Year()
-		photo.PhotoMonth = int(photo.TakenAtLocal.Month())
-	}
+	photo.UpdateYearMonth()
 
 	if originalName != "" {
 		file.OriginalName = originalName