[Python] Column with render_* method in django-tables2 not working

I have a table defined like this using django-tables2:

class MyTable(tables.Table):
action = tables.Column()

class Meta:
model = User
fields = ['name', 'email']

def render_action(self, record):
return 'Foo'


But the render_action method is ignored and a -- is printed for every row instead. What am I missing?

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