Django snippets: Base64Field: base64 encoding field for storing binary data in Django TextFields

import base64

from django.db import models


class Base64Field(models.TextField):

    def contribute_to_class(self, cls, name):
        if self.db_column is None:
            self.db_column = name
        self.field_name = name + '_base64'
        super(Base64Field, self).contribute_to_class(cls, self.field_name)
        setattr(cls, name, property(self.get_data, self.set_data))

    def get_data(self, obj):
        return base64.decodestring(getattr(obj, self.field_name))

    def set_data(self, obj, data):
        setattr(obj, self.field_name, base64.encodestring(data))

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This Base64Field class can be used as an alternative to a BlobField, which is not supported by Django out of the box.

The base64 encoded data can be accessed by appending _base64 to the field name. This is especially handy when using this field for sending eMails with attachment which need to be base64 encoded anyways.

Example use:

class Foo(models.Model):
    data = Base64Field()

foo = Foo()
foo.data = 'Hello world!'
print foo.data # will 'Hello world!'
print foo.data_base64 # will print 'SGVsbG8gd29ybGQh\n'

Author:: bikeshedder
Posted:: August 5, 2009
Language:: Python
Django Version:: 1.1
Tags:: django model field base64 blob base64field
Score:: 5 (after 5 ratings)

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kylec (on December 16, 2010):

To store values larger than 48k, add a db_type method that returns 'longtext'.

seafangs (on September 3, 2012):

Great snippet, thank you. Very useful in my current situation (which is: don't don't don't want to store images in a Blob, but have been more or less commanded to, as a 'holdover' or whatever).

and great tip kylec, thank you too

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Base64Field: base64 encoding field for storing binary data in Django TextFields

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