As we know, if we want to access user session from context within a inclusion tag, you can use takes_context argument and pass a request context in the view.
But in my project, it is more complicated:
The view is simple:
# views.py
def index(request):
form = PersonForm()
return render(request, 'add.html', {'form': form})
Templates:
# templates/add.html
<html>
<head>
<title>Add Person</title>
</head>
<body>
<form enctype="multipart/form-data" action="" method="post">
{{ form.as_p }}
</form>
{% render_attachments %}
...
</body>
</html>
# templates/list.html
{% load my_tags %}
<div class="attachments" style="margin:12px 0 12px 0;">
{% for attachment in attachments %}
<a href="{{ attachment.attachment_file.url }}">{{ attachment.filename }}
</a>
{% attachment_delete_link attachment %}
{% endfor %}
</div>
Here is my custom tags:
# my_tags.py
@register.inclusion_tag('attachments/list.html', takes_context=True)
def render_attachments(context):
session = context['request'].session
return {'attachments': session.get('attachments', [])}
@register.inclusion_tag('attachments/delete_link.html', takes_context=True)
def attachment_delete_link(context, attachment):
if context['user'] == attachment.creator:
return {
'delete_url': reverse('delete_attachment',
kwargs={'attachment_pk': attachment.pk})
}
return {'delete_url': None}
When i run my project, i got the following error:
KeyError at /person/
'user'
Request Method: GET
Request URL: http://localhost:8000/person/
Django Version: 1.5.1
Exception Type: KeyError
So, i print context out within two tags to find out what happened, it seemed that the request context does not passed into attachment_delete_link, how can i resolve this problem?
You are overwriting the whole context in render_attachments() you must return
def render_attachments(context):
# some code...
context['attachments'] = session.get('attachments', [])
return context
Same goes for attachment_delete_link().