CODEWITHSUNDEEP
djangodjango-models
Danilo Bargen
Danilo Bargen

Reputation: 19472

Overload get_FIELD_display() function

Is there a way to overload Django's get_FIELD_display() function properly? When I call the function from inside itself, the result is a recursion. But I can't call it using super() either, as it's not a parent class' method but a method created by the metaclass...

The goal is to have a common interface for getting a displayable version of a CHOICE field (which is given by get_FIELD_display), but with the possibility to customize it in some specific cases.

Example:

# This does not work because it results in recursion
def get_opposition_state_display(self):
    """Overloading of default function."""
    value = self.get_opposition_state_display()
    if self.opposition_state == 4: 
        return '%s %s' % (value, self.opposition_date.strftime('%d.%m.%Y'))
    return value

Upvotes: 3

Views: 1016

Answers (2)

Codeboy.ru
Codeboy.ru

Reputation: 81

To override get_FOO_display you need something like this:

field_name = models.PositiveSmallIntegerField('Field', choices=some_choices)

def _get_FIELD_display(self, field):
    f_name = field.name
    if f_name == 'field_name':
        return 'what_you_need'
    return super(YourModelName, self)._get_FIELD_display(field=field)

Upvotes: 2

second
second

Reputation: 28637

updated

field = self._meta.get_field('opposition_state')
value = self._get_FIELD_display(field)

Upvotes: 5

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