Simple Twig IF statement with variable in Symfony2

Question

I'm trying to only include some HTML based on an IF statement:

{% if "{{ app.request.attributes.get('var_name') }}" != "" %}
<meta id="var_name" content="{{ app.request.attributes.get('var_name') }}" />
{% endif %}

The above will work exactly as expected if the var_name variable holds data, but if it is empty or not defined it always returns the HTML like this:

<meta id="var_name" content="" />

...so basically it is registering the IF statement as true, even though there's nothing to show.

It makes no difference if the variable is defined or not.

Also, this:

{% if {{ app.request.attributes.get('var_name') }} != "" %}

...returns this error:

A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "punctuation" of value "{" in...

How do I do it?

Wouter J · Accepted Answer · 2013-03-22 14:54:32Z

7

Do this:

{% if app.request.attributes.get('var_name') != "" %}

You don't need the {{ }} inside the {% %}

More info: Twig - IF

edited Mar 22, 2013 at 14:54

Wouter J

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answered Mar 22, 2013 at 14:33

Baba Yaga

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1 Comment

user2143356 Over a year ago

Perfect. Simple when you know how! Thanks. I'll accept answer in 5 mins when it allows.

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