Check if the user who is making the request correspond to the connected user, inside "form_valid" django

I'm currently trying to improve my form, I would like to check if the connected user correspond to the user who publish the data

is it possible to add a condition inside the form_valid to see if the user from the model correspond to user from the request before posting the form

Model:

class Task(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True)
    title = models.CharField(max_length=200, null=True, blank=True)

view :

class TaskUpdate(LoginRequiredMixin, UpdateView):
    model = Task
    template_name = "tasks/task_form.html"
    form_class = DateInputForm

I already tried to do that :

def form_valid(self, form):

    if self.request.user.is_staff and self.object.user != self.request.user:
        return super().form_valid(form)


    if self.object.user != self.request.user:
        form.add_error(None, "You can't do that")
        return super().form_invalid(form)

also if I'm not a staff user, I can't have access to the input to select users, it's automatically assigns

<form action="" method="post">
    <div style="flex-direction: column">
        {% csrf_token %}

        <div style="margin-bottom: 10px">
            {% if admin %}
                <label for="user">User name : </label>
                {{ form.user }}
            {% endif %}
        </div>

I also thought of doing an sql query to see if the user making the query corresponds to the user registered for the task.

no solution for the moment

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