Python 如何在 Django 模板中查看一个字符串是否包含另一个字符串
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How to See if a String Contains Another String in Django Template
提问by curiousguy
This is my code in a template.
这是我在模板中的代码。
{% if 'index.html' in "{{ request.build_absolute_uri }}" %}
'hello'
{% else %}
'bye'
{% endif %}
Now my url value currently is "http://127.0.0.1:8000/login?next=/index.html"
现在我的网址值目前是 "http://127.0.0.1:8000/login?next=/index.html"
Even though "index.html"is there in the string it still prints bye.
即使"index.html"在字符串中它仍然打印再见。
When I run the same code in a python shell it works. Not sure what the mistake is.
当我在 python shell 中运行相同的代码时，它可以工作。不知道是什么错误。
采纳答案by Farmer Joe
Try removing the extra {{...}}tags and the "..."quotes around request.build_absolute_uri, it worked for me.
尝试删除额外的{{...}}标签和"..."周围的引号request.build_absolute_uri，它对我有用。
Since you are already within an {% if %}tag, there is no need to surround request.build_absolute_uriwith {{...}}tags.
由于您已经在{% if %}标签中，因此无需request.build_absolute_uri用{{...}}标签包围。
{% if 'index.html' in request.build_absolute_uri %}
hello
{% else %}
bye
{% endif %}
Because of the quotes you are literally searching the string "{{ request.build_absolute_uri }}"and not the evaluated Django tag you intended.
由于引号，您实际上是在搜索字符串，"{{ request.build_absolute_uri }}"而不是您想要的评估的 Django 标签。
回答by chenchuk
Maybe too late but here is a lightweight version :
也许为时已晚，但这里有一个轻量级版本：
{{ 'hello 'if 'index.html' in request.build_absolute_uri else 'bye' }}
This can be tested with Jinja:
这可以用 Jinja 测试：
>>> from jinja2 import Template
>>> t = Template("{{ 'hello 'if 'index.html' in request.build_absolute_uri else 'bye' }}")
>>> request = {}
>>> request['build_absolute_uri']='...index.html...'
>>> t.render(request=request)
'hello '
>>> request['build_absolute_uri']='something else...'
>>> t.render(request=request)
'bye'
>>>
