tasty-fast-dehydrate.py

from tastypie import fields
from tastypie.bundle import Bundle

class FastDehydratableForeignKey(fields.ForeignKey):
  def dehydrate(self, bundle):
    if isinstance(bundle, Bundle):
      other_resource = self.to_class()
      if hasattr(other_resource, '_meta') and other_resource._meta.object_class:
        fk_field = bundle.obj._meta.get_field(self.attribute)

        db_column = fk_field.db_column or '%s_id' % self.attribute

        if hasattr(bundle.obj, db_column):
          foreign_key = getattr(bundle.obj, db_column)
          return other_resource.get_resource_uri(other_resource._meta.object_class(pk=foreign_key))

    return super(FastDehydratableForeignKey, self).dehydrate(bundle)