def test_view_failed_delitem(attr):
    adata = gen_adata((10, 10))
    view = adata[5:7, :][:, :5]
    adata_hash = joblib.hash(adata)
    view_hash = joblib.hash(view)

    with pytest.raises(KeyError):
        getattr(view, attr).__delitem__("not a key")

    assert view.is_view
    assert adata_hash == joblib.hash(adata)
    assert view_hash == joblib.hash(view)
def add_forum(category_id=None):
    form = AddForumForm()

    if form.validate_on_submit():
        form.save()
        flash(_("Forum added."), "success")
        return redirect(url_for("management.forums"))
    else:
        form.groups.data = Group.query.order_by(Group.id.asc()).all()
        if category_id:
            category = Category.query.filter_by(id=category_id).first()
            form.category.data = category

    return render_template("management/forum_form.html", form=form,
                           title=_("Add Forum"))