How do I check if a Global field exists in a template?

Question

In a template, can I check whether a Global field exists, before I try to output its value? I want to ensure the page doesn't break entirely in the unlikely event of the field being removed from the CMS.

If I do:

{% if myGlobalSet.myField is defined %}
    Defined.
{% endif %}

then it works as expected; "Defined" isn't displayed if myField doesn't exist.

But if I have:

{% if myGlobalSet.myField is defined %}
    Defined. {{ myGlobalSet.myField }}
{% endif %}

I get:

Craft\GlobalSetModel and its behaviours do not have a method or closure named "myField".

if that field doesn't exist. It's like it's trying to process the field even though it's not defined.

score 1 · Answer 1 · edited Apr 13 '17 at 12:51

1

That's a known issue with Twig's is defined test. See here for an explanation and workarounds.

Note that this is no longer an issue in the upcoming Craft 3.

edited Apr 13 '17 at 12:51

Community

1

answered Oct 21 '15 at 16:34

Brad Bell

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Ah, thanks Brad. How do I use that workaround with a global rather than an entry though? myGlobalSet.type and myGlobalSet.myField.type both generate errors. – Phil Gyford Oct 21 '15 at 17:01
Ahh, good point. Let me think on it. – Brad Bell Oct 21 '15 at 17:53

Mike Pepper · Answer 2 · 2015-10-21T16:05:32.833

0

Try using BaseModel::getAttribute():

{% if myGlobalSet.getAttribute('myField') %}
    Defined.
{% else %}
    Not defined.
{% endif %}

I was going to suggest BaseElementModel::getFieldValue() as the "proper" way, but that throws an exception if the field isn't found at all, so I think getAttribute() is your best bet.

edited Oct 21 '15 at 16:05

answered Oct 21 '15 at 13:26

Mike Pepper

4,391
17
26

Thanks, but if I do that I still get the same error. – Phil Gyford Oct 21 '15 at 15:53

How do I check if a Global field exists in a template?

2 Answers2