Forum Discussion

Qrew Trainee

Re: Jinja2 Pipelines question, so nothing if field is empty

One more question. What's the logic behind {% if variable %}? Is there a difference between:

{% if variable %}
{% if variable is defined%}
{% if variable != '' %}

?

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Daniel Johnson
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3 Replies

SeanConnaughto1
Qrew Cadet
4 years ago
From what I understand (which may not be fully correct), using {% if variable is defined %} is checking if that variable exists, regardless of having data associated or not.

Using {% if variable %} equates the if statement to a basic true/false, true if there is any data associated, false if nothing is associated (or if the field value is 0). I think the use of {% if variable != '' %} just may not be best practice/correct usage in jinja2, but that is where I may be completely incorrect.

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Sean Connaughton
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- DanielJohnson2
  Qrew Trainee
  4 years ago
  Thanks Sean, that all makes sense.
  
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  Daniel Johnson
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  - DanielJohnson2
    Qrew Trainee
    4 years ago
    I posted this same question on Stack Overflow, and someone suggested:
    
    {% if c.call_rating not none %} Call Rating: {{c.call_rating}} {% endif %}
    However, Pipelines wouldn't let me save that, so I tried:
    
    {% if c.call_rating %} Call Rating: {{c.call_rating}} {% endif %}
    And that worked! Not defining the else seems to null the entry if {% if c.call_rating %} is false.
    
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    Daniel Johnson
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