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Create Project

Django-admin startproject myproject

Create App

python manage.py startapp library

Link App With Project

Add App With Django Project


INSTALLED_APPS = [
    'library',
]

project urls.py

path('students/', include('library.urls')),

Urls.py

library/urls.py

from django.urls import path
from .views import author_create, author_list,author_update,author_delete

urlpatterns = [
    path('author/create/', author_create, name='author_create'),
    path('author/list/', author_list, name='author_list'),
    path('author/update/<int:author_id>/', author_update, name='author_update'),
    path('author/delete/<int:author_id>/', author_delete, name='author_delete'),


]

Models

models.py

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


class Book(models.Model):
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    title = models.CharField(max_length=100)
    category = models.CharField(max_length=100,default='a')

    def __str__(self):
        return self.title

Forms

forms.py

from django import forms
from django.forms.models import inlineformset_factory
from .models import Author, Book

class AuthorForm(forms.ModelForm):
    class Meta:
        model = Author
        fields = ['name']


BookFormSet = inlineformset_factory(
    Author,
    Book,
    fields=('title','category',),
    extra=1,
    can_delete=False,
    min_num=1,
    validate_min=True
)

Views

views.py

from django.shortcuts import render, redirect,get_object_or_404
from .forms import AuthorForm, BookFormSet
from .models import Author,Book

def author_create(request):
    if request.method == 'POST':
        form = AuthorForm(request.POST)
        formset = BookFormSet(request.POST)

        if form.is_valid() and formset.is_valid():
            author = form.save()
            formset.instance = author
            formset.save()
            return redirect('author_list')
    else:
        form = AuthorForm()
        formset = BookFormSet()

    context = {
        'form': form,
        'formset': formset,
    }
    return render(request, 'library/author_create.html', context)


def author_list(request):
    authors = Author.objects.all()
    context = {'authors': authors}
    return render(request, 'library/author_list.html', context)

def author_update(request, author_id):
    author = get_object_or_404(Author, id=author_id)
    if request.method == 'POST':
        form = AuthorForm(request.POST, instance=author)
        formset = BookFormSet(request.POST, instance=author)

        if form.is_valid() and formset.is_valid():
            form.save()
            formset.save()
            return redirect('author_list')
    else:
        form = AuthorForm(instance=author)
        formset = BookFormSet(instance=author)

    context = {
        'form': form,
        'formset': formset,
    }
    return render(request, 'library/author_update.html', context)

def author_delete(request, author_id):
    author = get_object_or_404(Author, id=author_id)
    if request.method == 'POST':
        author.delete()
        return redirect('author_list')

    context = {
        'author': author
    }
    return render(request, 'library/author_delete.html', context)

Templates

templates/library/author_create.html

<!DOCTYPE html>
<html>
<head>
    <title>Create Author</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('.add-form').click(function() {
                cloneForm($(this).data('form-prefix'));
            });

            $('.remove-form').click(function() {
                removeForm($(this).data('form-prefix'));
            });

            function cloneForm(formPrefix) {
                const formContainer = $('.form-container').last();
                const totalForms = parseInt($('#id_' + formPrefix + '-TOTAL_FORMS').val());
                const newForm = formContainer.clone();
                
                newForm.find('input').val('');
                newForm.find('select').val('');
                newForm.find('input[type="hidden"]').remove();
                newForm.find('label.error').remove();

                formContainer.after(newForm);

                newForm.find('input, select').each(function() {
                    updateFormElementIndex($(this), formPrefix, totalForms);
                });

                $('#id_' + formPrefix + '-TOTAL_FORMS').val(totalForms + 1);
            }

            function removeForm(formPrefix) {
                const formContainer = $('.form-container');
                if (formContainer.length > 1) {
                    formContainer.last().remove();
                    updateFormIndex(formPrefix);
                }
            }

            function updateFormElementIndex(elem, formPrefix, formIndex) {
                const idRegex = new RegExp(formPrefix + '-(\\d+|__prefix__)-');
                const replacement = formPrefix + '-' + formIndex + '-';
                elem.attr('id', elem.attr('id').replace(idRegex, replacement));
                elem.attr('name', elem.attr('name').replace(idRegex, replacement));
                elem.attr('for', elem.attr('for').replace(idRegex, replacement));
            }

            function updateFormIndex(formPrefix) {
                const formContainer = $('.form-container');
                formContainer.each(function(index) {
                    $(this).find('input, select').each(function() {
                        updateFormElementIndex($(this), formPrefix, index);
                    });
                });
                $('#id_' + formPrefix + '-TOTAL_FORMS').val(formContainer.length);
            }
        });
    </script>
</head>
<body>
    <h1>Create Author</h1>
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        {{ formset.management_form }}
        <div class="formset-container">
            {% for form in formset %}
                <div class="form-container">
                    {{ form.as_table }}
                    {% if forloop.first %}
                        <button type="button" class="add-form" data-form-prefix="{{ formset.prefix }}">Add Book</button>
                    {% else %}
                        <button type="button" class="remove-form" data-form-prefix="{{ formset.prefix }}">Remove</button>
                    {% endif %}
                </div>
            {% endfor %}
        </div>
        <button type="submit">Save</button>
    </form>
</body>
</html>

templates/library/author_update.html

<!DOCTYPE html>
<html>
<head>
    <title>Update Author</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('.add-form').click(function() {
                cloneForm($(this).data('form-prefix'));
            });

            $('.delete-form').click(function() {
                deleteForm($(this).closest('.form-container'));
            });

            function cloneForm(formPrefix) {
                const formContainer = $('.form-container').last();
                const totalForms = parseInt($('#id_' + formPrefix + '-TOTAL_FORMS').val());
                const newForm = formContainer.clone();
                
                newForm.find('input').val('');
                newForm.find('select').val('');
                newForm.find('input[type="checkbox"]').prop('checked', false);
                newForm.find('input[type="hidden"]').remove();
                newForm.find('label.error').remove();

                formContainer.after(newForm);

                newForm.find('input, select').each(function() {
                    updateFormElementIndex($(this), formPrefix, totalForms);
                });

                $('#id_' + formPrefix + '-TOTAL_FORMS').val(totalForms + 1);
            }

            function deleteForm(formContainer) {
                const totalForms = parseInt($('#id_' + formContainer.data('form-prefix') + '-TOTAL_FORMS').val());

                if (totalForms > 1) {
                    formContainer.remove();
                    updateFormIndices(formContainer.data('form-prefix'));
                    $('#id_' + formContainer.data('form-prefix') + '-TOTAL_FORMS').val(totalForms - 1);
                }
            }

            function updateFormElementIndex(elem, formPrefix, formIndex) {
                const idRegex = new RegExp(formPrefix + '-(\\d+|__prefix__)-');
                const replacement = formPrefix + '-' + formIndex + '-';
                elem.attr('id', elem.attr('id').replace(idRegex, replacement));
                elem.attr('name', elem.attr('name').replace(idRegex, replacement));
                elem.attr('for', elem.attr('for').replace(idRegex, replacement));
            }

            function updateFormIndices(formPrefix) {
                $('.form-container').each(function(index) {
                    updateFormElementIndex($(this), formPrefix, index);
                });
            }
        });
    </script>
</head>
<body>
    <h1>Update Author</h1>
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        {{ formset.management_form }}
        <div class="formset-container">
            {% for form in formset %}
                <div class="form-container">
                    {{ form.as_table }}
                    {% if forloop.last %}
                        <button type="button" class="add-form" data-form-prefix="{{ formset.prefix }}">Add Book</button>
                    {% else %}
                        <button type="button" class="delete-form">Remove Book</button>
                    {% endif %}
                </div>
            {% endfor %}
        </div>
        <button type="submit">Save</button>
    </form>
</body>
</html>

templates/library/author_list.html

<!DOCTYPE html>
<html>
<head>
    <title>Author List</title>
</head>
<body>
    <h1>Author List</h1>
    <table>
        <thead>
            <tr>
                <th>Name</th>
                <th>Actions</th>
            </tr>
        </thead>
        <tbody>
            {% for author in authors %}
                <tr>
                    <td>{{ author.name }}</td>
                    <td>
                        <a href="{% url 'author_update' author.id %}">Edit</a>
                        <a href="{% url 'author_delete' author.id %}">Delete</a>
                    </td>
                </tr>
            {% endfor %}
        </tbody>
    </table>
    <a href="{% url 'author_create' %}">Add Author</a>
</body>
</html>

templates/library/author_delete.html

<!DOCTYPE html>
<html>
<head>
    <title>Delete Author</title>
</head>
<body>
    <h1>Delete Author</h1>
    <p>Are you sure you want to delete the author "{{ author.name }}"?</p>
    <form method="post">
        {% csrf_token %}
        <button type="submit">Delete</button>
        <a href="{% url 'author_list' %}">Cancel</a>
    </form>
</body>
</html>

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