def _convert_logical_conditions(self, condition, resource, request):
"""
Method that recursive converts condition tree to the django models Q objects.
"""
if condition.is_composed and condition.operator_slug == LOGICAL_OPERATORS.NOT:
return ~Q(self._convert_logical_conditions(condition.condition_right, resource, request))
elif condition.is_composed and condition.operator_slug == LOGICAL_OPERATORS.AND:
return Q(
self._convert_logical_conditions(condition.condition_left, resource, request),
self._convert_logical_conditions(condition.condition_right, resource, request)
)
elif condition.is_composed and condition.operator_slug == LOGICAL_OPERATORS.OR:
return Q(
self._convert_logical_conditions(condition.condition_left, resource, request) |
self._convert_logical_conditions(condition.condition_right, resource, request)
)
else:
try:
return self.get_filter(condition.identifiers, resource, request).get_q(
condition.value, condition.operator_slug, request
)
except FilterIdentifierError:
raise RESTException(
mark_safe(ugettext('Invalid identifier of condition "{}"').format(condition.source))
)
except FilterValueError as ex:
raise RESTException(
mark_safe(ugettext('Invalid value of condition "{}". {}').format(condition.source, ex))
)
except OperatorFilterError:
raise RESTException(
mark_safe(ugettext('Invalid operator of condition "{}"').format(condition.source))
)
def order(self, resource, qs, request):
try:
parsed_order_terms = self.parser.parse(request)
return qs.order_by(
*self._convert_order_terms(parsed_order_terms, resource, request)
) if parsed_order_terms else qs
except OrderParserError as ex:
raise RESTException(ex)
def get_requested_fields(self, resource, request):
try:
parsed_requested_rfs = self.parser.parse(request)
if parsed_requested_rfs is None:
return None
else:
return parsed_requested_rfs
except RESTException as ex:
raise RESTException(ex)
def filter(self, resource, qs, request):
try:
parsed_conditions = self.parser.parse(request)
return (qs.filter(pk__in=qs.filter(
self._convert_logical_conditions(parsed_conditions, resource,
request)).values('pk'))
if parsed_conditions else qs)
except FilterParserError as ex:
raise RESTException(ex)
def sort(self, resource, qs, request):
try:
parsed_order_terms = self.parser.parse(request)
sorters = self._get_sorters(parsed_order_terms or (), resource,
request)
qs = self._update_queryset(qs, sorters)
return qs.order_by(
*self._convert_order_terms(sorters)) if sorters else qs
except OrderParserError as ex:
raise RESTException(ex)
def filter(self, resource, qs, request):
try:
parsed_conditions = self.parser.parse(request)
if parsed_conditions:
q = self._convert_logical_conditions(parsed_conditions, resource, request)
if self._is_required_distinct(qs, q):
return qs.filter(pk__in=qs.filter(q).values('pk'))
else:
return qs.filter(q)
else:
return qs
except FilterParserError as ex:
raise RESTException(ex)
def post(self):
if not self.request.data:
raise RESTException(ugettext('Missing data'))
form = self.get_form_class()(**self.get_form_kwargs())
errors = form.is_invalid()
if errors:
self._unsucessful_login(self.request)
return RESTErrorResponse(errors)
self._sucessful_login(self.request)
self._login(form.get_user(), not form.is_permanent(), form)
return {'token': self.request.token.key, 'user': form.get_user()}
def _convert_order_terms(self, parsed_order_terms, resource, request):
"""
Method that converts order terms to the django query order strings.
"""
ordering_strings = []
for ordering_term in parsed_order_terms:
try:
ordering_strings.append('{}{}'.format(
'-' if ordering_term.direction == DIRECTION.DESC else '',
self.get_order_string(ordering_term.identifiers, resource, request)
))
except OrderIdentifierError:
raise RESTException(
mark_safe(ugettext('Invalid identifier of ordering "{}"').format(ordering_term.source))
)
return ordering_strings
def _get_sorters(self, parsed_order_terms, resource, request):
"""
Converts order terms to sorter classes
"""
sorters = []
for ordering_term in parsed_order_terms:
try:
sorters.append(
self.get_sorter(ordering_term.identifiers,
ordering_term.direction, resource,
request))
except OrderIdentifierError:
raise RESTException(
mark_safe(
ugettext('Invalid identifier of ordering "{}"').format(
ordering_term.source)))
return sorters
