I m writing a simple templatetag that gets one item and call one of its methods to get and prepare some data. And I wonder where I should call it, in Node or in compiler? Thanks for advices!
实际上，模板标记根本不应该与数据库交互。至少不是在与模型/业务数据交互的意义上。这将违反关注点的分离，这是首先使用MVC（呃，MTV）风格框架的主要原因之一。
如果您谈论的是一个数据驱动的模板标记，它出于某种原因与数据库交互，只处理表示级别的东西，那么它应该在Node中的一个方法中，该方法在Nodesrender方法中调用。
class MyCustomNode(template.Node):
def __init__(self, ...):
...
def render(self, context):
# do your db lookup here
return some_string_using_the_db_stuff
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