dalproperty.py

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from __future__ import absolute_import
 
 
def _return_relation(relation, multi=False, data=None,
                     dalobj=None, cache=None):
 
    if dalobj:
        setattr(dalobj, '__%s_data' % relation, (data, cache))
 
    def getter(obj):
 
        try:
            val = getattr(obj, '__%s' % relation)
        except AttributeError:
            try:
                ldata, lcache = obj.__dict__.pop('__%s_data' % relation)
            except KeyError:
                raise AttributeError
 
            if not multi:
                ldata = [ldata]
 
            val = []
            for k in ldata:
                if k.UID() in lcache[k.class_name()]:
                    val.append(lcache[k.class_name()][k.UID()])
                else:
                    val.append(k.as_dal(lcache))
 
            if not multi:
                val = val[0]
 
            setattr(obj, '__%s' % relation, val)
 
        return val
 
    return getter
 
 
def _assign_relation(relation):
    from .dal import DalBase
 
    def setter(obj, value):
        setattr(obj, '__%s' % relation, value)
        getattr(DalBase, '_updated').add(obj)
 
    return setter
 
 
def _return_attribute(attribute, dalobj=None, value=None):
 
    if dalobj:
        setattr(dalobj, '__%s' % attribute, value)
 
    def getter(obj):
        return getattr(obj, '__%s' % attribute)
 
    return getter
 
 
def _assign_attribute(attribute):
    from .dal import DalBase
 
    def setter(obj, value):
        setattr(obj, '__%s' % attribute, value)
        getattr(DalBase, '_updated').add(obj)
 
    return setter