extract a little more shared case /longs

longs/models.py

@@ -38,6 +38,7 @@ from generic.models import (
     QuestionBase,
     QuestionNote,
     SeriesBase,
+    SeriesImageBase,
     UserAnswerBase,
     UserUserGroup,
 )
@@ -351,24 +352,12 @@ def test_image_validator(file):
     pass
 
 
-class LongSeriesImage(models.Model):
+class LongSeriesImage(SeriesImageBase):
     image = models.FileField(upload_to=image_directory_path)
-    position = models.IntegerField(default=0)
-    upload_filename = models.CharField(max_length=255, blank=True)
     series = models.ForeignKey(
         "LongSeries", related_name="images", on_delete=models.SET_NULL, null=True
     )
 
-    class Meta:
-        ordering = ["position"]
-
-    def get_dicom_info(self):
-        try:
-            info = pretty_print_dicom(pydicom.read_file(self.image))
-        except pydicom.errors.InvalidDicomError:
-            info = "File is not a dicom."
-        return info
-
 
 @reversion.register
 class LongSeries(SeriesBase):