package.py 文件源码

def get_relationships(self, with_package=None, type=None, active=True,
                          direction='both'):
        '''Returns relationships this package has.
        Keeps stored type/ordering (not from pov of self).'''
        assert direction in ('both', 'forward', 'reverse')
        if with_package:
            assert isinstance(with_package, Package)
        from package_relationship import PackageRelationship
        forward_filters = [PackageRelationship.subject==self]
        reverse_filters = [PackageRelationship.object==self]
        if with_package:
            forward_filters.append(PackageRelationship.object==with_package)
            reverse_filters.append(PackageRelationship.subject==with_package)
        if active:
            forward_filters.append(PackageRelationship.state==core.State.ACTIVE)
            reverse_filters.append(PackageRelationship.state==core.State.ACTIVE)
        if type:
            forward_filters.append(PackageRelationship.type==type)
            reverse_type = PackageRelationship.reverse_type(type)
            reverse_filters.append(PackageRelationship.type==reverse_type)
        q = meta.Session.query(PackageRelationship)
        if direction == 'both':
            q = q.filter(or_(
            and_(*forward_filters),
            and_(*reverse_filters),
            ))
        elif direction == 'forward':
            q = q.filter(and_(*forward_filters))
        elif direction == 'reverse':
            q = q.filter(and_(*reverse_filters))
        return q.all()