Source code for cement.core.meta
"""Cement core meta functionality."""
[docs]
class Meta(object):
"""
Container class for meta attributes of a larger class. Keyword arguments
are set as attributes of ``self``.
"""
def __init__(self, **kwargs):
self._merge(kwargs)
def _merge(self, dict_obj):
for key in dict_obj.keys():
setattr(self, key, dict_obj[key])
[docs]
class MetaMixin(object):
"""
Mixin that provides the meta class support to add settings to instances
of objects. Meta keys cannot start with a ``_``.
"""
def __init__(self, *args, **kwargs):
# Get a List of all the Classes we in our MRO, find any attribute named
# Meta on them, and then merge them together in order of MRO
metas = reversed([x.Meta for x in self.__class__.mro()
if hasattr(x, "Meta")])
final_meta = {}
# Merge the Meta classes into one dict
for meta in metas:
final_meta.update(dict([x for x in meta.__dict__.items()
if not x[0].startswith("_")]))
# Update the final Meta with any kwargs passed in
for key in final_meta.keys():
if key in kwargs:
final_meta[key] = kwargs.pop(key)
self._meta = Meta(**final_meta)
# FIX ME: object.__init__() doesn't take params without exception
super(MetaMixin, self).__init__()