def resolve_model(request, mount):
"""Resolve path to a model using consumers.
"""
lookup = request.lookup # XXX can get this from argument too
# consume steps toward model
mounts = request.mounts
model = mount
mounts.append(model)
while request.unconsumed:
next_model = generic.consume(request, model, lookup=lookup)
if next_model is None:
return model
model = next_model
if isinstance(model, Mount):
mounts.append(model)
# get new lookup for whatever we found if it exists
lookup = generic.lookup(model, lookup=lookup, default=lookup)
request.lookup = lookup
# if there is nothing (left), we consume toward a root model
if not request.unconsumed:
root_model = generic.consume(request, model, lookup=lookup)
if root_model is not None:
model = root_model
# XXX handling mounting? lookups? write test cases
request.lookup = lookup
return model
