[inlined form field] fix regression introduced in 3.16.4/570208f74a84. Closes #3064653
In the above changeset, we changed ordered entities to be edited according to
mandatory inlined constraints, though this leads to unpredictable order in
cases where there are no constraint. This leads to case where inlined relation
field may think there is no value related to a mandatory relation, while this
is simply because there is a value specified but to an entity that will be
created later (together with the relation).
To fix this, we've to use the fact that the RelationField.process_form_value
return None in cases where there is some entity to be created, while an empty
set when there are no linked entity. The new no_value() method allows to
differentiate between those different notion of 'no-value'.
"""twisted server for CubicWeb web instances
:organization: Logilab
:copyright: 2001-2011 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
class HTTPResponse(object):
"""An object representing an HTTP Response to be sent to the client.
"""
def __init__(self, twisted_request, code=None, headers=None, stream=None):
self._headers_out = headers
self._twreq = twisted_request
self._stream = stream
self._code = code
self._init_headers()
self._finalize()
def _init_headers(self):
if self._headers_out is None:
return
# initialize headers
for k, values in self._headers_out.getAllRawHeaders():
self._twreq.responseHeaders.setRawHeaders(k, values)
# add content-length if not present
if (self._headers_out.getHeader('content-length') is None
and self._stream is not None):
self._twreq.setHeader('content-length', len(self._stream))
def _finalize(self):
# we must set code before writing anything, else it's too late
if self._code is not None:
self._twreq.setResponseCode(self._code)
if self._stream is not None:
self._twreq.write(str(self._stream))
self._twreq.finish()
def __repr__(self):
return "<%s.%s code=%d>" % (self.__module__, self.__class__.__name__, self._code)