Skip to content
Related Articles

Related Articles

BinaryField – Django Models
  • Difficulty Level : Basic
  • Last Updated : 12 Feb, 2020

BinaryField is a special field to store raw binary data. It can be assigned bytes, bytearray, or memoryview. By default, BinaryField sets editable to False, that is it can’t be included in a ModelForm. Since BinaryField stores raw data or in other terms a python object, it can not be manually entered and needs to be assigned through a view or django shell. This is what editable to False means, that is it can’t be edited through any form.


field_name = models.BinaryField(**options)

Django Model BinaryField Explanation

Illustration of BinaryField using an Example. Consider a project named geeksforgeeks having an app named geeks.

Refer to the following articles to check how to create a project and an app in Django.

Enter the following code into file of geeks app.

from django.db import models
from django.db.models import Model
# Create your models here.
class GeeksModel(Model):
    geeks_field = models.BinaryField()

Add the geeks app to INSTALLED_APPS

# Application definition

Now when we run makemigrations command from the terminal,

Python makemigrations

A new folder named migrations would be created in geeks directory with a file named

# Generated by Django 2.2.5 on 2019-09-25 06:00
from django.db import migrations, models
class Migration(migrations.Migration):
    initial = True
    dependencies = [
    operations = [
            name ='GeeksModel',
            fields =[
                  models.AutoField(auto_created = True,
                  primary_key = True,
                  serialize = False
                  verbose_name ='ID'
                ('geeks_field', models.BinaryField()),

Thus, an geeks_field BigIntegerField is created when you run makemigrations on the project.It is a field to store raw binary data.

How to use BinaryField ?

Any type of data can be converted into bytes including integers, srings, images, etc. Let’s try to save a string into the BinaryField. String can be converted to bytes using the generic bytes function. This function internally points to CPython Library which implicitly calls the encode function for converting the string to specified encoding.

# importing the model
# from geeks app
from geeks.models import GeeksModel
# creating a string
test_string = "GFG is best"
# creating a bytes object
res = bytes(test_string, 'utf-8')
# creating a instance of 
# GeeksModel
geek_object = GeeksModel.objects.create(geeks_field = res)

Now let’s check it in admin server. We have created an instance of GeeksModel
Possible errors

As specified, BinaryField is a non-editable field, if you manually try to make it editable using editable=True it will create unexpected errors. It should be created in a function so that objects can be allocated to it.


Field Options

Field Options are the arguments given to each field for applying some constraint or imparting a particular characteristic to a particular Field. For example, adding an argument null = True to BinaryField will enable it to store empty values for that table in relational database.
Here are the option and attributes that an BinaryField can use.

Field Options Description
Null If True, Django will store empty values as NULL in the database. Default is False.
Blank If True, the field is allowed to be blank. Default is False.
db_column The name of the database column to use for this field. If this isn’t given, Django will use the field’s name.
Default The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.
help_text Extra “help” text to be displayed with the form widget. It’s useful for documentation even if your field isn’t used on a form.
primary_key If True, this field is the primary key for the model.
editable If False, the field will not be displayed in the admin or any other ModelForm. They are also skipped during model validation. Default is True.
error_messages The error_messages argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override.
help_text Extra “help” text to be displayed with the form widget. It’s useful for documentation even if your field isn’t used on a form.
verbose_name A human-readable name for the field. If the verbose name isn’t given, Django will automatically create it using the field’s attribute name, converting underscores to spaces.
validators A list of validators to run for this field. See the validators documentation for more information.
Unique If True, this field must be unique throughout the table.

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :