CharField has one more required argument:
The maximum length (in characters) of the field. Maximum
max_length applies at the database level and when validating Django using MaxLengthValidator .
field_name = models.CharField (max_length = 200, ** options )
Django CharField Model Explanation
CharField illustration using example. Consider a project named
pythonengineering that has an application named
Refer to the following articles to check how to create a project and an app in Django.
Enter the following code into the
models.py file of the geeks application.
Add the geek app to
Now when we run
makemigrations from the terminal,
Python manage.py makemigrations
A new folder named migrations will be created in the
geeks directory with a file named
Now run ,
Python manage.py migrate
geeks_field CharField is generated when migrations are run in the project. This is a field for storing small and large strings.
How to use a CharField?
A CharField is used to store small strings in the database. You can store first name, last name, address, and so on. The CharField must have a
max_length argument to specify the maximum length of the string that you want to store. On a production server, after deploying a Django app, space is very limited. Therefore, it is always optimal to use max_length as required by the field. Let’s create the CharField instance we created and check if it works.
Now let’s check it out on the admin server faith. We have created an instance of GeeksModel.
Field options — they are arguments given to each field to apply some constraint or to convey a specific characteristic to a particular field. For example, adding the
null = True argument to the CharField will allow it to store empty values for that table in a relational database.
Here are the field options and attributes that CharField 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 (eg, 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.|