how to show only data True in a foreign key of python

models.py:

class Article(models.Model):
    ...
    user_create = models.ForeignKey(User, null=True, related_name = 'user_create')

upd.html:

...
<label class="control-label col-md-2">Creador</label>
<div class="col-md-7">
    {{ form.user_create }}
    <span style="color: red;">{{ form.user_create.errors }}</span>
</div>

views.py:

...
form = ArticleForm(request.POST, instance=articulo)