How do you check if an object exists in the Twig templating engine in Symfony2?
Quickly did a lookup, hope this is works for you :p
defined checks if a variable is defined in the current context. This is very useful if you use the strict_variables option:
{# defined works with variable names #}{% if foo is defined %} ...{% endif %}{# and attributes on variables names #}{% if foo.bar is defined %} ...{% endif %}