Question

我想在添加之后过滤查询集。见下文

view.py

documents = Document.objects.all()

for document in documents:
  document.hello = "Hello"
  # Lots more happens here like carrying out more querying and appending things on to document

drawings = documents.filter(type='d')
schedules = documents.filter(type='s')

# Context.... render... etc..

模板

{% for document in drawings %}

<p>{{document.hello}}</p>

{% endfor %}

{% for document in schedules %}

<p>{{document.hello}}</p>

{% endfor %}

我遇到的问题是，在执行过滤器时，附加的信息（例如“Hello＆＃39;”）正在丢失。如果我做以下所有工作正常。

{% for document in documents %}

<p>{{document.hello}}</p>

{% endfor %}

如何通过过滤器传输附加信息。我应该使用自定义模板过滤器而不是在视图中执行吗？

由于

Answer 1

filter将创建新的queryset对象。而不是它，你可以用Python过滤：

for document in documents:
  document.hello = "Hello"
  # Lots more happens here like carrying out more querying and appending things on to document

drawings = [document for document in documents if document.type == 'd']
schedules = [document for document in documents if document.type == 's']
context = {'documents': documents, 'drawings': drawings, 'schedules': schedules}

您需要向上下文添加新列表才能在模板中使用它们：

{% for document in drawings %}

<p>{{document.hello}}</p>

{% endfor %}

<强> UPD

或者你可能不想使用annotation：

from django.db.models import CharField, Value

documents=Document.objects.annotate(hello=Value('hello',output_field=CharField()))
drawings=documents.filter(type='d')
schedules=documents.filter(type='s')

Django - 追加后过滤查询集

1 个答案: