[Answered ]-No Watchlist matches the given query

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1👍

✅

That’s because for that user, no Watchlist was added yet, you can create one if missing with:

def add_to_watchlist(request, item_id):
    item = get_object_or_404(Listing, pk=item_id)
    user_watchlist, __ = Watchlist.objects.get_or_create(user=request.user)
    user_watchlist.items.add(item)
    return redirect('watchlist')

Note: Section 9 of the HTTP protocol
specifies that requests like GET and HEAD should not have side-effects, so you
should not change entities with such requests. Normally POST, PUT, PATCH, and
DELETE requests are used for this. In that case you make a small <form> that
will trigger a POST request, or you use some AJAX calls. Some browsers look for
links and exhaustively already cache the responses of such links, so these might
trigger such views with side-effects.

👤willeM_ Van Onsem

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