Jtwig if expression fails: Unable to find implementation for operator !=

Question

I wrote if expression, according documentation I found. Here is what I tried:

{% if idol_response.didYouMean != "" %}
    <p>aaaaaaa</p>
{% endif %}

also:

{% if (idol_response.didYouMean != "") %}
    <p>aaaaaaa</p>
{% endif %}

and:

{% if (not idol_response.didYouMean == "") %}
    <p>aaaaaaa</p>
{% endif %}

Any of the above do not work, which kind of makes me nervous ;-) The first two gives:

HTTP Status 500 - Request processing failed; nested exception is com.lyncode.jtwig.exception.CompileException: Unable to find implementation for operator !=

I do not comment the third expression, because I admit it is not correct syntax. First two should be fine acording to all sources. didYouMean is a field of idol_response object and I need to check if it is empty or not.

I would appreciate any help.

Answer 1

The first and second expressions was a known bug, which was fixed in 3.0.1, check https://github.com/lyncode/jtwig/pull/179 .

The third expression is an operation precedence issue. Try the following:

{% if (not (idol_response.didYouMean == "")) %}
<p>aaaaaaa</p>
{% endif %}