ó EõMPc@sBdZdefd„ƒYZdefd„ƒYZdd„ZdS(s Convenience routines for creating non-trivial Field subclasses, as well as backwards compatibility utilities. Add SubfieldBase as the metaclass for your Field subclass, implement to_python() and the other necessary methods and everything will work seamlessly. t SubfieldBasecBseZdZd„ZRS(s… A metaclass for custom Field subclasses. This ensures the model's attribute has the descriptor protocol attached to it. cCs@tt|ƒj||||ƒ}t||jdƒƒ|_|S(Ntcontribute_to_class(tsuperRt__new__t make_contribtgetR(tclstnametbasestattrst new_class((s<../Django//lib/python/django/db/models/fields/subclassing.pyRs!(t__name__t __module__t__doc__R(((s<../Django//lib/python/django/db/models/fields/subclassing.pyR stCreatorcBs,eZdZd„Zdd„Zd„ZRS(sT A placeholder class that provides a way to set the attribute on the model. cCs ||_dS(N(tfield(tselfR((s<../Django//lib/python/django/db/models/fields/subclassing.pyt__init__scCs,|dkrtdƒ‚n|j|jjS(Ns%Can only be accessed via an instance.(tNonetAttributeErrort__dict__RR(Rtobjttype((s<../Django//lib/python/django/db/models/fields/subclassing.pyt__get__s cCs#|jj|ƒ|j|jjs