Only My Notes

Part of the Users and Accounts section of Coddy's Django journey. Lesson 9 of 16.

Every note has an owner, but the list still shows Note.objects.all(): ada reads bob's diary. The list should show only the notes of whoever is asking.

You filter on a ForeignKey with an object, not a name. A library site lists one author's books:

author = Author.objects.get(name="Ursula K. Le Guin")
books = Book.objects.filter(author=author)

Django compares the author's id. Passing the name, filter(author="Ursula K. Le Guin"), fails with ValueError.

When the row to compare with is the visitor, there is nobody to look up: Django already put the signed in user on every request, as an object, from the session. Never take the user from the URL or a form field, which anyone can change.

Challenge

Easy

In note_list, list only the notes of the signed in user.

Press Run and log in as ada, then log out and log in as bob (both use coddy-pass-123). Each sees only their own notes.

Try it yourself

from django.contrib.auth import login
from django.contrib.auth.decorators import login_not_required
from django.contrib.auth.forms import UserCreationForm
from django.shortcuts import get_object_or_404, redirect, render

from .forms import NoteForm
from .models import Note


def note_list(request):
    notes = Note.objects.all()
    return render(request, "notes/note_list.html", {"notes": notes})


def note_detail(request, pk):
    note = get_object_or_404(Note, pk=pk)
    return render(request, "notes/note_detail.html", {"note": note})


def note_create(request):
    if request.method == "POST":
        form = NoteForm(request.POST)
        if form.is_valid():
            note = form.save(commit=False)
            note.owner = request.user
            note.save()
            return redirect("notes:detail", pk=note.pk)
    else:
        form = NoteForm()
    return render(request, "notes/note_form.html", {"form": form})


def note_edit(request, pk):
    note = get_object_or_404(Note, pk=pk)
    if request.method == "POST":
        form = NoteForm(request.POST, instance=note)
        if form.is_valid():
            form.save()
            return redirect("notes:detail", pk=note.pk)
    else:
        form = NoteForm(instance=note)
    return render(request, "notes/note_form.html", {"form": form, "note": note})


def note_delete(request, pk):
    note = get_object_or_404(Note, pk=pk)
    if request.method == "POST":
        note.delete()
        return redirect("notes:list")
    return render(request, "notes/note_confirm_delete.html", {"note": note})


@login_not_required
def signup(request):
    if request.method == "POST":
        form = UserCreationForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect("notes:list")
    else:
        form = UserCreationForm()
    return render(request, "notes/signup.html", {"form": form})