symfony - How to use if else for a controller variable on twig -

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what im trying compare imageowner (variable returned controller) current user

<!-- image remove button -->   {% if {{ imageowner }} == {{ app.user.username }} %} //line 5     <p>you owner of image</p>      <button onclick="deletestuff()">deleted</button>  {% endif %}

but throws error

a hash key must quoted string, number, name, or expression enclosed in parentheses (unexpected token "punctuation" of value "{" inlayoutbundle:frontpage:content-bubble.html.twig @ line 5

the {{ imageowner }} , {{ app.user.username }} return right values, think syntax or logical error

use 

 {% if imageowner  == app.user.username %} //line 5     <p>you owner of image</p>      <button onclick="deletestuff()">deleted</button>  {% endif %}

{{ imageowner }} slimier echo $imageowner in php. not need wrap variable {{}} when don't want print it.


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