from django.http import HttpResponse
from django.template import loader
from django.template.base import Template
from django.utils.translation import gettext as _
from concurrency.compat import TemplateDoesNotExist
from concurrency.exceptions import RecordModifiedError
class ConflictResponse(HttpResponse):
status_code = 409
def callback(target, *args, **kwargs):
raise RecordModifiedError(_('Record has been modified'), target=target)
[docs]def conflict(request, target=None, template_name='409.html'):
"""409 error handler.
:param request: Request
:param template_name: `409.html`
:param target: The model to save
"""
try:
template = loader.get_template(template_name)
except TemplateDoesNotExist: # pragma: no cover
template = Template(
'<h1>Conflict</h1>'
'<p>The request was unsuccessful due to a conflict. '
'The object changed during the transaction.</p>')
try:
saved = target.__class__._default_manager.get(pk=target.pk)
except target.__class__.DoesNotExist: # pragma: no cover
saved = None
ctx = {'target': target,
'saved': saved,
'request_path': request.path}
return ConflictResponse(template.render(ctx))