Django Serializers

Definition of Django Serializers

Basically, Django provides different types of features to the user, in which the serializer is one of the features that is provided by Django. Normally serializer is nothing but the Django REST framework and it provides the functionality to convert objects into different data types. This converted data type is understandable by the front-end framework and JavaScript. On the other hand, it also provides deserialization functionality to the user which means it allows us to parse the data and convert it back into complex data types whenever required. The serializer REST framework works similarly to the Django model classes.

What is a Django serializers?

Serializers permit complex information, for example, querysets and model cases to be changed over completely to local Python data types that can then be effortlessly delivered into JSON, XML, or other substance types. Serializers likewise give deserialization, permitting parsed information to be changed over once more into complex sorts, after first approving the approaching information.

The serializers in the REST system work much the same way as Django’s Form and ModelForm classes. We give a Serializer class which gives you a strong, conventional method for controlling the result of your reactions, as well as a ModelSerializer class which gives a valuable easy route to making serializers that arrange with model cases and querysets. In another word, we can say that Serialization is the most common way of changing information into a configuration that can be put away or sent and afterward remade. It’s pre-owned constantly while creating applications or putting away information in data sets, in memory, or changing it into records.

How to use Django serializers?

Now let’s see how we can use the Django serializer as follows.

First, we need to set up the new environment with the help of venu as follows.

venu env

After that we need to install all required packages with the help of the below commands as follows.

pip install django

pip install djangorestframework

Now everything is ok we can start the project with the help of the below command as follows.

cd ~
django-admin startproject sampledemo
cd sampledemo

We enter inside the project; here we can create a new application for web API as follows.

python manage.py startapp demo

After starting the app we can check setting.py as follows.

INSTALLED_APPS = [
    ...
    'rest_framework',
    ' demo ',
]

In the next step, we need to create the model which means we need to write code inside the models.py file as follows.

from django.db import models
class student(models.Model):
studname = models.CharField(max_length=100, blank=False, default='')
studcity = models.CharField(max_length=100, blank=False, default='')
studclass = models.CharField(max_length=100, blank=False, default='')
class Meta:
	ordering =['created']

Now we need to create a serializer class as follows.

First, we need to start the Web API that provides the serializing and deserializing instances that is json.

from rest_framework import serializers
from studdent.models import Studnet
class StudentSerializer(serializers.Serializer):
	studname = serializers.CharField(max_length=100, blank=False, default='')
studcity = serializers.CharField(max_length=100, blank=False, 
default='Mumbai')
studclass = serializers.CharField(max_length=100, blank=False, default='')
	def create(self, valid_data):
	return Student.object.create(valid_data)
	def update(self, instance, valid_data):
	instance.studname = valid_data.get(‘studname’, instance.studname)
	instance.studcity = valid_data.get(‘studcity’, instance.studcity)
	instance.studclass = valid_data.get(‘studclass’, instance.studclass)
	instance.save()
return instance

Explanation

In the above code first, we define the different fields that are serialized or deserialized. After that, we created two different methods for creating and updating instances as shown.

Now let’s see how we can use serializers as follows.

from students.models import Student
from studnets.serializers import StudnetSerializer
from rest_framework.renderers import JSONRenderer
from rest_framework.parsers import JSONParser
student = Student(code='studname= "Jenny"\n')
student.save()
student = Student(code=' studclass= "second"\n')
student.save()

Now let’s see the instance of the serializer as follows.

Serializer = StudentSerializer(student)
Serializer.data
{'studname': Jenny, 'studcity': 'Mumbai', 'studclass': 'second'}

So in this way, we can add more instances.

Django serializers REST Framework

Now let’s see the serializers REST framework as follows.

Serializers in Django REST Framework is liable for changing over objects into information types justifiable by javascript and front-end systems. Serializers likewise give deserialization, permitting parsed information to be changed over once more into complex kinds, after first approving the approaching information. The serializers in the REST system work in much the same way as Django’s Form and ModelForm classes. The two significant serializers that are most prominently utilized are ModelSerializer and HyperLinkedModelSerialzer.

This article rotates around how to involve serializers without any preparation in Django REST Framework to cutting-edge serializer fields and contentions.

First, we need to create serializers as follows.

For creating a serializers first we need to import the serializers class from rest_framework and need to define the required field as follows.

from rest_framework import serializers
class StudentSerializer(serializers.Serializer):
   studname = serializers.CharField(max_length = 100)
    email = serializers.EmailField()
    city= serializers.CharField(max_length = 100)

This is the first way to create a serializer for a specific substance or item founded on the fields required. Serializers can be utilized to serialize as well as deserialize the information.

Now let’s see how we can use the serializer as follows.

from datetime import datetime
class Remark(object)
def _init_(self, studname, email, city):
	self.studname =studname
	self.email = email
	self.city= city
	self.date = datetime,now()
remark = remark(studname= 'Jenny', email='sample@gmail.com', remark='bar')

Now our serializer object is ready we can run the above code and after the execution of the above code, we can see the result in the below screenshot as follows.

Now let’s see what ModelSerializer is as follows.

The ModelSerializer class gives an easy route that allows you consequently to make a Serializer class with fields that relate to the Model fields.

The ModelSerializer class is equivalent to a customary Serializer class, then again, actually:

• It will consequently produce a bunch of fields for you, in light of the model.
• It will consequently produce validators for the serializer, for example, unique_together validators.
• It incorporates straightforward default executions of .create() and .update().

Conclusion

With the help of the above article, we try to learn about the Django Serializer. From this article, we learn basic things about the Django Serializer and we also see the features and examples of the Django Serializer and how we use it in the Django Serializer.