How can I make all CharField in uppercase direct in model?

I tried to use UpperCase in all my CharField, in all my Django Model.

Today I have some code in my save method:

def save(self, *args, **kwargs):
        for field_name in ['razao_social', 'nome_fantasia', 'cidade', 'endereco','bairro', 'uf', 'cli_parc_nomeparc', 'cli_repr_nomerepr']:
            val = getattr(self, field_name, False)
            if val:
                setattr(self, field_name, val.upper())
        super(Pessoa, self).save(*args, **kwargs)

But its take some time. There`s any method to put some uppercase=True in my models?

Thanks.

Solution

The correct way would be to define custom model field:

from django.db import models
from django.utils.six import with_metaclass


class UpperCharField(with_metaclass(models.SubfieldBase, models.CharField)):
    def __init__(self, *args, **kwargs):
        self.is_uppercase = kwargs.pop('uppercase', False)
        super(UpperCharField, self).__init__(*args, **kwargs)

    def get_prep_value(self, value):
        value = super(UpperCharField, self).get_prep_value(value)
        if self.is_uppercase:
            return value.upper()

        return value

and use it like so:

class MyModel(models.Model):
    razao_social = UpperCharField(max_length=50, uppercase=True)
    # next field will not be upper-cased by default (it's the same as CharField)
    nome_fantasia = UpperCharField(max_length=50)
    # etc..

you also need to resolve south migration issues (if necessary), by adding this code:

from south.modelsinspector import add_introspection_rules
add_introspection_rules([
    (
        [UpperCharField],
        [],
        {
            "uppercase": ["uppercase", {"default": False}],
        },
    ),
], ["^myapp\.models\.UpperCharField"])

(path in the last line depends on the field class localization. Please read the south docs for explanation.)

Although there's a small downside when you use shell for instance to create model object and save it in variable:

my_object = MyModel.objects.create(razao_social='blah')
print my_object.razao_social

you won't get upper-cased value. You need to retrieve the object from the database. I will update this post, when I find out how to resolve this issue as well.