def add_metadata(self, fragment, nasp):
""" Adds metadata to a given fragment
with an optional namespace attribute
"""
try:
imgmeta = Metadata.get(imgfrag=fragment, namespace=nasp)
newimgmetaversion = imgmeta.version
newimgmetaversion = newimgmetaversion + 1
up_query = Metadata.update(version=newimgmetaversion).where(imgfrag=fragment, namespace=nasp)
up_query.execute()
return imgmeta
except Metadata.DoesNotExist:
imgmeta = Metadata.create(
imgfrag = fragment,
version = 1,
namespace = nasp,)
imgmeta.save()
return imgmeta
