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FloatField — Django Models

Syntax :

 field_name = models.FloatField ( ** options ) 

Django FloatField Model Explanation

FloatField illustration using example. Consider a project named pythonengineering that has an application named geeks .

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 INSTALLED_APPS

from django.db import models

from django.db.models import Model

# Create your models here.

  

class GeeksModel (Model):

geeks_field = models.FloatField ()

Now when we run the makemigrations command from the terminal,

 Python manage.py makemigrations 

In the geeks directory a new folder named migrations will be created with a file named 0001_initial.py

# Application definition

 

INSTALLED_APPS = [

  ’ django .contrib.admin’

’django.contrib.auth’ ,

’django.contrib.contenttypes’ ,

  ’ django.contrib.sessions’ ,

’django.contrib.messages’ ,

’django.contrib.staticfiles’ ,

’geeks’ ,

]

# Generated by Django 2.2.5 on 2019-09- 06:00 25

 

from django.db import migrations, models

 

class Migration (migrations.Migration):

 

initial = True

 

dependencies = [

]

 

operations = [

migrations.CreateModel (

name = ’GeeksModel’ ,

  fields = [

( ’id’

models.AutoField (

auto_creat ed = True ,

primary_key = True ,

serialize = False

  verbose_name = ’ ID’

)),

( ’geeks_field’

models.FloatField ()),

],

< p> ),

]

Now run,

 Python manage.py migrate 

Thus, geeks_field FloatField is created when migrations are run in the project. This is a field for storing a floating point number.

How to use a FloatField?

A FloatField is used to store a floating point number represented in Python by a floating point instance. To learn more about float visit

# model import
# from the geek app

from geeks.models import GeeksModel

 
# create an instance
# float

d = float ( 21.89 )

 
# create an instance
# GeeksModel

geek_object = GeeksModel.objects.create (geeks_field = d)

geek_object.save ()

Now let’s check it out on the admin server. We have created a GeeksModel instance.

Field options

Field parameters — they are arguments given to each field to apply some constraint or to convey a particular characteristic to a particular field. For example, adding the null = True argument to the FloatField will allow it to store empty values ​​for that table in a relational database. 
Here are the field options and attributes that the FloatField 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.
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.

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