def _get_link_details(entity, link_name):
""""Lookup the (edge_class, left_edge_id, right_edge_id, node_class)
for the given entity and link_name.
param entity: The current entity Node subclass
:param str link_name: The association proxy name
edge_class: The Edge subclass the association is proxied through
left_edge_id: The edge.{src,dst}_id
right_edge_id: The edge.{dst,src}_id (opposit of left_edge_id)
node_class: The target node the association_proxy points to
"""
# Look for the link_name in OUTBOUND edges from the current
# entity
for edge in Edge._get_edges_with_src(entity.__name__):
if edge.__src_dst_assoc__ == link_name:
return (edge, edge.src_id, edge.dst_id,
Node.get_subclass_named(edge.__dst_class__))
# Look for the link_name in INBOUND edges from the current
# entity
for edge in Edge._get_edges_with_dst(entity.__name__):
if edge.__dst_src_assoc__ == link_name:
return (edge, edge.dst_id, edge.src_id,
Node.get_subclass_named(edge.__src_class__))
raise AttributeError(
"type object '{}' has no attribute '{}'"
.format(entity.__name__, link_name))
def _get_link_details(entity, link_name):
""""Lookup the (edge_class, left_edge_id, right_edge_id, node_class)
for the given entity and link_name.
param entity: The current entity Node subclass
:param str link_name: The association proxy name
edge_class: The Edge subclass the association is proxied through
left_edge_id: The edge.{src,dst}_id
right_edge_id: The edge.{dst,src}_id (opposit of left_edge_id)
node_class: The target node the association_proxy points to
"""
# Look for the link_name in OUTBOUND edges from the current
# entity
for edge in Edge._get_edges_with_src(entity.__name__):
if edge.__src_dst_assoc__ == link_name:
return (edge, edge.src_id, edge.dst_id,
Node.get_subclass_named(edge.__dst_class__))
# Look for the link_name in INBOUND edges from the current
# entity
for edge in Edge._get_edges_with_dst(entity.__name__):
if edge.__dst_src_assoc__ == link_name:
return (edge, edge.dst_id, edge.src_id,
Node.get_subclass_named(edge.__src_class__))
raise AttributeError("type object '{}' has no attribute '{}'".format(
entity.__name__, link_name))
