如何在Symfony 3中自动检查变量是否为空？

(Sorry for this bad english)

I would like to know if it's possible to automatically check if variables from MySQL request are not empty in Symfony 3. I know that I can put {% if foo is defined %} in Twig or something like this but I didn't find if there's a way to do it automatically. I can test the request in the controller too. But with those solutions I have to do it for every request.

All my website uses "if not empty then show it" that's why I'm trying to find it.

Edit : I know how to check every fields of every request in Twig or in php (Controller) one by one but there is a lot of duplication code, which is "boring". Thats why I am asking you if something automatic exists to check my data. (parameter in Symfony, ...)

Thank you <3

If I understand, your problem :

You want to iterate on each property in an entity. But you can't, then you are searching for a solution to not write :

{% if entity.property1 %}
    {{ entity.property1 }}
{% endif %}
{% if entity.property2 %}
    {{ entity.property2 }}
{% endif %}
{% if entity.property3 %}
    {{ entity.property3 }}
{% endif %}

You have two solutions to make your properties traversable :

• Get your entity with a Doctrine query using ->getArrayResult() instead of ->getResult()

• Use ReflectionClass to get the properties as an array :

  http://php.net/manual/fr/class.reflectionclass.php

So you can iterate on each property, and do something like that :

{# Where you get your entity as an array #}
{% for property in entity %}
   {% if not property  is null %}
        {{ property }}
   {% endif %}
{% endfor %}

{# where fields comes from the ReflectionClass #}
{% for field in fields %}
   {% if not attribute(entity,field) is null %}
        {{ attribute(entity,field)}}
   {% endif %}
{% endfor %}

Use the Twig strict_variables config parameter and set it to false (should be the default value):

strict_variables boolean

If set to false, Twig will silently ignore invalid variables (variables and or attributes/methods that do not exist) and replace them with a null value. When set to true, Twig throws an exception instead (default to false).