Twig and operator "!"?

Question

symfony

Something now came across that construct:

{% if(!campaign) %}
    <p class="lead">За {{ date|date("d.m.Y") }} нет статистики по этой кампании</p>
{% endif %}

does not work, you have to use this crutch:

{% if(campaign) %}
{% else %}
    <p class="lead">За {{ date|date("d.m.Y") }} нет статистики по этой кампании</p>
{% endif %}

Are there other simple solutions?

Answer 1

{% if not campaign %}

Answer 2

Another such option will also work

{% if campaign = false %}
    <p class="lead">За {{ date|date("d.m.Y") }} нет статистики по этой кампании</p>
{% endif %}