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Django CRUD (Create, Retrieve, Update, Delete)

Step 1: Create the Django project and app

Open your terminal (or command prompt) and run the following commands:

# Create the Django project
django-admin startproject crud_project
cd crud_project

# Create a new app inside the project
python manage.py startapp crud_app
Step 2: Define the model and set up the database

Edit the models.py file in the crud_app directory:

# crud_app/models.pyfrom django.db import models

class MyModel(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()
    email = models.EmailField()

    def __str__(self):
        return self.name

After defining the model, run migrations to create the database table:

python manage.py makemigrations
python manage.py migrate
Step 3: Create views for add, update, and delete operations

Edit the views.py file in the crud_app directory:

# crud_app/views.pyfrom django.shortcuts import render, redirect, get_object_or_404
from .models import MyModel
from .forms import MyModelForm

def add_data(request):
    if request.method == 'POST':
        form = MyModelForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('show_data')
    else:
        form = MyModelForm()
    return render(request, 'add_data.html', {'form': form})

def update_data(request, pk):
    obj = get_object_or_404(MyModel, pk=pk)
    if request.method == 'POST':
        form = MyModelForm(request.POST, instance=obj)
        if form.is_valid():
            form.save()
            return redirect('show_data')
    else:
        form = MyModelForm(instance=obj)
    return render(request, 'update_data.html', {'form': form})

def delete_data(request, pk):
    obj = get_object_or_404(MyModel, pk=pk)
    if request.method == 'POST':
        obj.delete()
        return redirect('show_data')
    return render(request, 'delete_data.html', {'obj': obj})
Step 4: Create forms for the model

Create a new file named forms.py in the crud_app directory to define the form for the model:

# crud_app/forms.pyfrom django import forms
from .models import MyModel

class MyModelForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ('name', 'age', 'email')
Step 5: Create templates for add, update, and delete operations

Create templates for the views we defined earlier.

a. add_data.html:

<!-- crud_app/templates/add_data.html --><!DOCTYPE html><html><head><title>Add Data</title></head><body><h1>Add Data</h1><form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <input type="submit" value="Save"></form></body></html>

b. update_data.html:

<!-- crud_app/templates/update_data.html --><!DOCTYPE html><html><head><title>Update Data</title></head><body><h1>Update Data</h1><form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <input type="submit" value="Save"></form></body></html>

c. delete_data.html:

<!-- crud_app/templates/delete_data.html --><!DOCTYPE html><html><head><title>Delete Data</title></head><body><h1>Delete Data</h1><p>Are you sure you want to delete {{ obj.name }}?</p><form method="post">
        {% csrf_token %}
        <input type="submit" value="Delete"></form></body></html>
Step 6: Create URL patterns

Edit the urls.py file in the crud_project directory:

# crud_project/urls.pyfrom django.urls import path
from crud_app import views

urlpatterns = [
    path('add/', views.add_data, name='add_data'),
    path('update/<int:pk>/', views.update_data, name='update_data'),
    path('delete/<int:pk>/', views.delete_data, name='delete_data'),
    path('show/', views.show_data, name='show_data'),  # Add this if you haven't done it before
]
Step 7: Run the development server

Now, start the development server using the following command:

python manage.py runserver

Visit http://127.0.0.1:8000/add/ in your browser to add new data. To update and delete data, visit the corresponding URLs as specified in the URL patterns (e.g., http://127.0.0.1:8000/update/1/ to update data with primary key 1, and http://127.0.0.1:8000/delete/1/ to delete data with primary key 1).

That's it! You now have a Django project that allows you to add, update, and delete data using Django's ORM system.

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