The Target table has the members "file_name" and "file_size" for its image file(s). However, a target can and mostly likely will have multiple generated images, and while the name will be the same (modulo the file name extensions from Build.image_fstypes) each image will have a different file size.

The requirement is to create a new table of Target image names and sizes, keyed to the parent Target pk.

For example:

  class Target_Image_File(models.Model):
    target = models.ForeignKey(Target,related_name='target_image')
    file_name = models.FilePathField(max_length=255, blank=True)
    file_size = models.IntegerField()