def __call__(self, instance, *args, **kwargs):
"""
Intercept attempts to call the GremlinMethod attribute and perform a gremlin query returning the results.
:param instance: The class instance the method was called on
:param pool: The RexPro connection pool to execute the query with (optional)
:type instance: object
"""
self._setup()
# pop the optional execute query arguments from kwargs
query_kwargs = connection.pop_execute_query_kwargs(kwargs)
query_kwargs['transaction'] = query_kwargs.get('transaction') or self.transaction
args = list(args)
if not self.classmethod:
args = [instance._id] + args
params = self.defaults.copy()
if len(args + list(kwargs.values())) > len(self.arg_list): # pragma: no cover
raise TypeError('%s() takes %s args, %s given' % (self.attr_name, len(self.arg_list), len(args)))
#check for and calculate callable defaults
for k, v in params.items():
if callable(v):
params[k] = v()
arglist = self.arg_list[:]
for arg in args:
params[arglist.pop(0)] = arg
for k, v in kwargs.items():
if k not in arglist:
an = self.attr_name
if k in params: # pragma: no cover
raise TypeError("%s() got multiple values for keyword argument '%s'" % (an, k))
else: # pragma: no cover
raise TypeError("%s() got an unexpected keyword argument '%s'" % (an, k))
arglist.pop(arglist.index(k))
params[k] = v
params = self.transform_params_to_database(params)
import_list = []
for imp in self.imports + self.extra_imports:
if imp is not None:
for import_string in imp.import_list:
import_list.append(import_string)
import_string = '\n'.join(import_list)
script = '\n'.join([import_string, self.function_body])
try:
if hasattr(instance, 'get_element_type'):
context = "vertices.{}".format(instance.get_element_type())
elif hasattr(instance, 'get_label'):
context = "edges.{}".format(instance.get_label())
else:
context = "other"
context = "{}.{}".format(context, self.method_name)
tmp = connection.execute_query(script, params, context=context, **query_kwargs)
except MogwaiQueryError as pqe: # pragma: no cover
import pprint
msg = "Error while executing Gremlin method\n\n"
msg += "[Method]\n{}\n\n".format(self.method_name)
msg += "[Params]\n{}\n\n".format(pprint.pformat(params))
msg += "[Function Body]\n{}\n".format(self.function_body)
msg += "[Imports]\n{}\n".format(import_string)
msg += "\n[Error]\n{}\n".format(pqe)
if hasattr(pqe, 'raw_response'):
msg += "\n[Raw Response]\n{}\n".format(pqe.raw_response)
raise MogwaiGremlinException(msg)
return tmp
def create(cls, *args, **kwargs):
"""Create a new element with the given information."""
# pop the optional execute query arguments from kwargs
query_kwargs = connection.pop_execute_query_kwargs(kwargs)
return cls(*args, **kwargs).save(**query_kwargs)