How to do it...

The CRUDL functionality in Django consists of forms, views, and URL rules. Let's create them:

1. Add a new forms.py file to the ideas app with the model form for adding and changing the instances of your Idea model:

# myprojects/apps/ideas/forms.py
from django import forms
from .models import Idea

class IdeaForm(forms.ModelForm):
    class Meta:
        model = Idea
        fields = "__all__"

2. Add a new views.py file to the ideas app with the views to manipulate the Idea model:

# myproject/apps/ideas/views.py
from django.contrib.auth.decorators import login_required
from django.shortcuts import render, redirect, get_object_or_404
from django.views.generic import ListView, DetailView

from .forms import IdeaForm
from .models import Idea


class IdeaList(ListView):
    model = Idea


class IdeaDetail(DetailView):
    model = Idea
    context_object_name = "idea"


@login_required
def add_or_change_idea(request, pk=None):
    idea = None
    if pk:
        idea = get_object_or_404(Idea, pk=pk)

    if request.method == "POST":
        form = IdeaForm(
            data=request.POST, 
            files=request.FILES, 
            instance=idea
        )

        if form.is_valid():
            idea = form.save()
            return redirect("ideas:idea_detail", pk=idea.pk)
    else:
        form = IdeaForm(instance=idea)

    context = {"idea": idea, "form": form}
    return render(request, "ideas/idea_form.html", context)


@login_required
def delete_idea(request, pk):
    idea = get_object_or_404(Idea, pk=pk)
    if request.method == "POST":
        idea.delete()
        return redirect("ideas:idea_list")
    context = {"idea": idea}
    return render(request, "ideas/idea_deleting_confirmation.html", context)

3. Create the urls.py file in the ideas app with the URL rules:

# myproject/apps/ideas/urls.py
from django.urls import path

from .views import (
    IdeaList,
    IdeaDetail,
    add_or_change_idea,
    delete_idea,
)

urlpatterns = [
    path("", IdeaList.as_view(), name="idea_list"),
    path("add/", add_or_change_idea, name="add_idea"),
    path("<uuid:pk>/", IdeaDetail.as_view(), name="idea_detail"),
    path("<uuid:pk>/change/", add_or_change_idea,  
     name="change_idea"),
    path("<uuid:pk>/delete/", delete_idea, name="delete_idea"),
]

4. Now, let's plug in these URL rules to the project's URL configuration. We will also include the accounts' URL rules from the Django-contributed auth app, so that our @login_required decorator works properly:

# myproject/urls.py
from django.contrib import admin
from django.conf.urls.i18n import i18n_patterns
from django.urls import include, path
from django.conf import settings
from django.conf.urls.static import static
from django.shortcuts import redirect


urlpatterns = i18n_patterns(
    path("", lambda request: redirect("ideas:idea_list")),
    path("admin/", admin.site.urls),
    path("accounts/", include("django.contrib.auth.urls")),
    path("ideas/", include(("myproject.apps.ideas.urls", "ideas"), 
 namespace="ideas")),
)
urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
urlpatterns += static("/media/", document_root=settings.MEDIA_ROOT)

5. You should now be able to create the following templates:

• registration/login.html with a form to log in
• ideas/idea_list.html with a list of ideas
• ideas/idea_detail.html with the details about an idea
• ideas/idea_form.html with a form to add or change an idea
• ideas/idea_deleting_confirmation.html with an empty form to confirm idea deletion

In the templates, you can address the URLs of the ideas app via the namespace and path names as follows:

{% load i18n %}
<a href="{% url 'ideas:change_idea' pk=idea.pk %}">{% trans "Change this idea" %}</a>
<a href="{% url 'ideas:add_idea' %}">{% trans "Add idea" %}</a>