Hello,
I have a number of SQLObject-derived classes and want to provide them with the
common functionality. I wrote a separate ResourceMixin class which is then
specified in class' declaration, like this:
class Foo(ResourceMixin, SQLObject):
name = UnicodeCol(length=255)
...
ResourceMixin define some utility methods that got mixed in and worked fine.
Then I decided to reduce duplicate code further by moving properties
declaration into the mixin. E.g. each of model classes contained declaration of
_get_something and _set_something and I wanted to move this into ResourceMixin.
And here is the problem. How can I do this?
I was trying to add a metaclass to ResourceMixin that would inspect the class
and attach these properties but run into a strange conflict with SQLObject's
own magic:
File "D:\Projects\Spaca\spaca\model.py", line 69, in ?
class ResourceMixin(object):
File "D:\Projects\Spaca\spaca\model.py", line 67, in __new__
return super(ResourceMixinMeta, cls).__new__(name, bases,dict)
TypeError: Error when calling the metaclass bases
type.__new__(X): X is not a type object (str)
The code is as follows:
class ResourceMixinMeta(type):
def __new__(cls, name, bases, dict):
print 'new', cls, name, bases
return super(ResourceMixinMeta, cls).__new__(name, bases,dict)
class ResourceMixin(object):
__metaclass__ = ResourceMixinMeta
...
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