如何覆盖/自定义Jinja2模板中（本机）对象的默认格式？

I want to change the default way dates are presented to me in the flask admin, to give it a specific timezone and display it in a more human-readable format.

我想更改在刻录机管理员中显示日期的默认方式，为其提供特定的时区并以更易于阅读的格式显示。

There are a number of ways of going about this (filters, __html__, __str__, Babel, etc), but while these could work, my question is whether there is a more general approach for a more general problem. The specific problem of formatting dates is just an example.

有很多方法可以解决这个问题（过滤器，__ html__，__str __，Babel等），但是虽然这些方法可行，但我的问题是，对于更普遍的问题是否有更通用的方法。格式化日期的具体问题只是一个例子。

In my scenario, I don't have control over the date object -- I can't subclass it or monkeypatch a __str__ or __html__ method. I want it to happen automatically for all dates in the templates, and I don't want to have to write custom admin templates, and I don't want to have to use explicit filters in my templates for this scenario.

在我的场景中，我无法控制日期对象 - 我不能将其子类化或monkeypatch __str__或__html__方法。我希望它自动发生在模板中的所有日期，我不想编写自定义管理模板，我不想在我的模板中使用显式过滤器来实现此方案。

My ideal solution would be to somehow specify a default filter to Jinja, so that all data was passed through that filter before being presented. I can write the filter myself, but I can't see how to get Jinja to use it.

我理想的解决方案是以某种方式为Jinja指定一个默认过滤器，以便所有数据在呈现之前通过该过滤器。我自己可以编写过滤器，但我看不出如何让Jinja使用它。

One thought I had was to use autoescaping somehow (see this question), but I can't see any way to override Jinja's autoescaping functionality without nasty monkeypatching.

我有一个想法是以某种方式使用自动转换（请参阅此问题），但我看不出任何方法来覆盖Jinja的自动转换功能而没有令人讨厌的monkeypatching。

Any ideas?

有任何想法吗？

2 个解决方案

#1

If you want that in Flask-Admin related code, you can rely on column_type_formatters.

如果您想在Flask-Admin相关代码中使用它，则可以依赖column_type_formatters。

https://flask-admin.readthedocs.org/en/latest/api/mod_model/#flask.ext.admin.model.BaseModelView.column_type_formatters

#2

You don't have to monkeypatch anything.

你不需要做任何东西。

You just create a custom base class for your Model views with custom formatters. An example for date class:

您只需使用自定义格式化程序为模型视图创建自定义基类。日期类的示例：

from datetime import date
from flask_admin.model import typefmt


def date_format(view, value):
    return value.strftime('%d.%m.%Y')

MY_DEFAULT_FORMATTERS = dict(typefmt.BASE_FORMATTERS)
MY_DEFAULT_FORMATTERS.update({
    date: date_format,
})

class MyModelView(BaseModelView):
    column_type_formatters = MY_DEFAULT_FORMATTERS

#1