Mixins CLass base views#

mixin simplify our work and implement as dry(don’t repeate yourself) principals. 😏

Mixins:

ListModelMixin
CreateModelMixin
RetrieveModelMixin
UpdateModelMixin
DestroyModelMixin

Mixins provided us

Action methods

mixin Classes

Handler Methods

list()

ListModelMixin

get()

create()

CreateModelMixin

post()

retrieve()

RetrieveModelMixin

get()

update()

UpdateModelMixin

put()

destroy()

DestroyModelMixin

delete()

যে রকম Acrion Method এর out-come প্রয়োজন সেই রকম mixins class কে parameter হিসেবে define করতে হবে এবং Handler Method কে call করলেই DRF বাকি সব execution নিজেই করে নিবে।


github link


একটি demo DataBase table same as funcrion and classbase:

models.py#


from django.db import models

# Create your models here.
class Student(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=20)
    score = models.DecimalField(max_digits=10,decimal_places=3)

    def __str__(self):
        return self.name

then serializer data-base table for querify and work in Views.py as DRF procedure

serializers.py#


from rest_framework import serializers
from .models import Student

class StudentSerializer(serializers.ModelSerializer):
    class Meta:
        model=Student
        fields=['id', 'name','score']

আমরা এই post এ Mixins class base view ( generics,mixins) নিয়ে কাজ করেছি, যা ২ টা stage এ ঘটেছে।

  • 1.create and view(non-primary key base operations)

  • 2.delete, update and view(primary key base operations).

views.py#


from django.shortcuts import render

from cbvApp.models import Student
from cbvApp.serializers import StudentSerializer

from rest_framework import generics,mixins


# just call and use handler method

# non-primery key based operations
class StudentList(mixins.ListModelMixin,mixins.CreateModelMixin,generics.GenericAPIView):
    queryset = Student.objects.all()
    serializer_class= StudentSerializer

    def get(self,request):
        return self.list(request)

    def post(self,request):
        return self.create(request)


# primery key based operations

class StudentDetail(mixins.RetrieveModelMixin,mixins.UpdateModelMixin,mixins.DestroyModelMixin,generics.GenericAPIView):
    queryset = Student.objects.all()
    serializer_class= StudentSerializer

    def get(self,request,pk):
        return self.retrieve(request,pk)

    def put(self,request,pk):
        return self.update(request,pk)

    def delete(self,request,pk):
        return self.destroy(request,pk)

urls.py#

same as class base views


from django.urls import path
from .import views

urlpatterns = [
    path('s/',views.StudentList.as_view()),
    path('s/<int:pk>',views.StudentDetail.as_view()),

]
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