BigAutoField is a 64-bit integer, much like an AutoField except that it is guaranteed to fit numbers from 1 to 9223372036854775807. One can create a BigAutoField using the following syntax,
id = models.BigAutoField(primary_key=True, **options)
This is an auto-incrementing primary key just like AutoField.
Django Model BigAutoField Explanation
Illustration of BigAutoField using an Example. Consider a project named
geeksforgeeks having an app named
Refer to the following articles to check how to create a project and an app in Django.
Enter the following code into
models.py file of geeks app.
Add the geeks app to
Now when we run
makemigrations command from the terminal,
Python manage.py makemigrations
A new folder named migrations would be created in
geeks directory with a file named
big_id BigAutoField that auto increments on every instance of that model is created when you run makemigrations on the project. It is a primary key to the table created for the model named
since a Django model can have at most one autofield, BigAutoField must be created at the very first migration with
primary_key=Trueattribute otherwise it will raise multiple errors.
“AssertionError: A model can’t have more than one AutoField.”
If you get this error try deleting the recent migrations and adding primary_key=True to the field. Run Migrations again to solve the problem.
If we create objects of this empty model from the admin server. we can see id field autoincrementing on every instance created.
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
primary_key=True to BigAutoField will make it primary key for that table in relational database.
Here are the option and attributes that an BigAutofield can use.
|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.|
|Choices||An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field.|
|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.|
|Unique||If True, this field must be unique throughout the table.|
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