django render会删除上下文值

Question

早上好Django社区：

我有一个奇怪的context问题。

我使用函数get_context_data返回一个字典，该字典加载到render中的上下文参数中。我正在向视图中的context字典添加值，这些值在模板中呈现后无法访问。

url模式：

url(r'^view_tutors/(?P<pk>[0-9]+)/$', ModelInstanceView.as_view(), {'model': Tutor,
'model_two': TutorEvent}, name='view_tutors'),

view.py:

class ModelInstanceView(LoginRequiredMixin, DetailView):
"""
This view shows all information specific to one instance
of a model.
Needs extra functionality for tutors whose info is much more complicated
"""
def get_model_instance_dict(self, pk, model):
fields = []
self.model = model
for field in list(self.model._meta.get_fields()):
if hasattr(field, 'verbose_name'):
fields.append(field.verbose_name)
elif isinstance(field, ManyToOneRel):
pass
else:
fields.append(str(field).split(':')[-1].split('.')[-1])
#        try:
values = list(self.model.objects.values_list().filter(pk=pk)[0])
print values
if hasattr(self.model, 'related_set'):  # ?
fields.append('Tutors at this Site')
related_values = self.model.objects.get(gg=pk).related_set.all()
tutors_at_site = ''
for x in range(len(related_values)):
tutors_at_site += str(related_values[x].first_name + ' ' + related_values[x].last_name + ', ')
values.append(tutors_at_site[:-2])
model_instance_dict = OrderedDict(zip(fields, values))
# except IndexError:  # no record for the pk
#     model_instance_dict = None
return model_instance_dict
def get_context_data(self, pk, **kwargs):
model = self.kwargs['model']
print 'THE MODEL 0', model, type(model)
context = {
"model_name": str(model.__name__),
"model_select": model.objects.get(pk=pk),
"model": self.get_model_instance_dict(pk, model),
"id": pk,
}
if model.__name__ == 'Tutor':
events = self.kwargs['model_two']
context["edit_model_url"] = 'edit_' + str(model.__name__).lower(),
context["events_name"] = str(events.__name__),
context["events"] = events.objects.filter(tutor_id=pk).values()
context["edit_events_url"] = 'edit_' + str(events.__name__).lower(),
context["create_events_url"] = 'create_' + str(events.__name__).lower()
print context
return context
def get(self, request, pk, **kwargs):
return render(request, 'athena_app/model_detail.html', {'output': self.get_context_data(pk)})

model_detail模板：

{% debug %}
<table border="2" class="tablemodel">
<style>
.model_row:hover {
background-color: #e8d2f7;
cursor: pointer;
}
.model {
text-align: center;
}
</style>
{{ output.events }}
<tr>
<th class="col-md-2">Event</th>
<th class="col-md-2">Event Date</th>
</tr>
{% for event in output.events %}
<tr class="model_row" onclick="document.location='/{{ output.edit_events_url }}/{{ id }}'">
<!-- <td>{{ output.event }}</td> -->
<td>{{ output.event.tutor_id }}</td>
<td>{{ output.event }}</td>
</tr>
{% empty %}
<li>This tutor has not attended any events.</li>
{% endfor %}
</table>

我可以将上下文字典变量作为调试打印到我的终端中，并在context['events']中查看相应的TutorEvent查询集。但是，在模板中，{debug}'events'键返回一个空值。我可以将{ output.events }作为字典列表打印在模板中，但我不能以任何方式对其进行迭代，正如您在模板中看到的那样。

如能提供任何专业帮助，我们将不胜感激。

Answer 1

使用event作为循环变量，正确地迭代output.events。但在循环中，由于某种原因，您正在使用output.event。应该是：

{% for event in output.events %}
<tr class="model_row" onclick="document.location='/{{ output.edit_events_url }}/{{ id }}'">
<!-- <td>{{ event }}</td> -->
<td>{{ event.tutor_id }}</td>
<td>{{ event }}</td>
</tr>
...