I create Serializer class and use it for all my models with: Base =
declarative_base(cls=Serializer)
But I have one problem! I have Organization model and Service model that has
"organization = relationship('Organization', backref='services')" relationship
and I get "RuntimeError: maximum recursion depth exceeded while calling a
Python object"
What can I do with that? Help me please!
Traceback (most recent call last):
File "s.py", line 10, in <module>
print repr(r.to_dict())
File "/Users/sector119/PycharmProjects/epsilon/epsilon/models/serializer.py",
line 31, in to_dict
value = self._serialize(key, field.value)
File "/Users/sector119/PycharmProjects/epsilon/epsilon/models/serializer.py",
line 48, in _serialize
result.append(cls._serialize(key, v))
File "/Users/sector119/PycharmProjects/epsilon/epsilon/models/serializer.py",
line 51, in _serialize
result = value.to_dict()
File "/Users/sector119/PycharmProjects/epsilon/epsilon/models/serializer.py",
line 31, in to_dict
...
...
...
File
"/Users/sector119/PythonVirtualEnv/epsilon/lib/python2.7/site-packages/sqlalchemy/orm/state.py",
line 671, in value
self.state.obj(), self.state.class_)
File
"/Users/sector119/PythonVirtualEnv/epsilon/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py",
line 233, in __get__
dict_ = instance_dict(instance)
RuntimeError: maximum recursion depth exceeded while calling a Python object
from datetime import datetime, date
from sqlalchemy.inspection import inspect
class Serializer(object):
__public__ = None
__private__ = None
def to_dict(self, exclude=(), extra=()):
data = {}
items = inspect(self).attrs.items()
if self.__public__:
public = self.__public__ + extra
else:
public = extra
if self.__private__:
private = self.__private__ + exclude
else:
private = exclude
for key, field in items:
if private and key in private:
continue
if public and key not in public:
continue
value = self._serialize(key, field.value)
if value:
data[key] = value
return data
@classmethod
def _serialize(cls, key, value):
print 'Field name: %s' % key
if isinstance(value, (datetime, date)):
print 'Type date'
result = value.isoformat()
elif hasattr(value, '__iter__'):
print 'Type iterable'
result = []
for v in value:
result.append(cls._serialize(key, v))
elif isinstance(value, Serializer):
print 'Type Serializer'
result = value.to_dict()
else:
print 'Type other'
result = value
print 'Result %r\n' % result
return result
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