def _create(self, req, body):
        context = req.environ['nova.context']
        authorize(context)
        if not self.is_valid_body(body, 'flavor'):
            msg = _("Invalid request body")
            raise webob.exc.HTTPBadRequest(explanation=msg)
        vals = body['flavor']
        name = vals.get('name')
        flavorid = vals.get('id')
        memory = vals.get('ram')
        vcpus = vals.get('vcpus')
        root_gb = vals.get('disk')
        ephemeral_gb = vals.get('OS-FLV-EXT-DATA:ephemeral', 0)
        swap = vals.get('swap', 0)
        rxtx_factor = vals.get('rxtx_factor', 1.0)
        is_public = vals.get('os-flavor-access:is_public', True)

        try:
            flavor = flavors.create(name, memory, vcpus, root_gb,
                                    ephemeral_gb=ephemeral_gb,
                                    flavorid=flavorid, swap=swap,
                                    rxtx_factor=rxtx_factor,
                                    is_public=is_public)
            if not flavor['is_public']:
                flavors.add_flavor_access(flavor['flavorid'],
                                          context.project_id, context)
            req.cache_db_flavor(flavor)
        except (exception.InstanceTypeExists,
                exception.InstanceTypeIdExists) as err:
            raise webob.exc.HTTPConflict(explanation=err.format_message())
        except exception.InvalidInput as exc:
            raise webob.exc.HTTPBadRequest(explanation=exc.format_message())

        return self._view_builder.show(req, flavor)