multiple editions什么版本（Multiple arguments in Django template filters）

时间2025-05-01 17:45:00分类IT科技浏览4256

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Multiple arguments in Django template filters

By default, it is not currently possible to pass multiple arguments to Django template filter — documentation states: "Custom filters are just Python functions that take one or two arguments".

Here Idescribe solution that allows passing more arguments.

Lets say we have key and current query_string in our template context. We loop in paginator and alter query_string current key value with page. The key is to group arguments in an array. We use following custom filter:

@register.filter def keys (first,second): if isinstance(first,list): return first+[second] else: return[first,second]

following filter allows us to:

which will return in our template:

[u1, u2, u3]

Returning to described query_string altering problem — we use alter_query filter:

@register.filter def alter_query (keys, query_string): from django.http importQueryDict query_dict =QueryDict(query_string,mutable=True) query_dict[keys[0]]= keys[1] return query_dict.urlencode()

inside pagination template, we use following code:

<ahref="?{{ key|keys:page|alter_query:query_string }}">{{ page }}</a>

Doesnt look pretty, but works perfectly.

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