Since jinja2 uses python under the hood, you get the benefit of python
truthiness checks. I would probably write this as:
{% if foo is defined and foo %}
In some cases this can be shortened to just:
{% if foo %}
The inverse to see if it is empty is:
{% if not foo %}
On Thu, Nov 20, 2014 at 2:02 PM, Brian Coca <[email protected]> wrote:
> would this not work?
> foo|length == 0
>
> On Thu, Nov 20, 2014 at 2:21 PM, Dmitry Makovey <[email protected]>
> wrote:
> > Hi,
> >
> > several times now I came across situation where one of the modules
> returns
> > 'empty list' in variable and it would be handy to have a simple test
> like:
> >
> > {% if foo is empty %}
> >
> > which is not the same as
> >
> > {% if foo is defined %}
> >
> > because former case covers also "", [], {} and None as well as
> "undefined".
> > Sort of like "empty()" call in PHP.
> >
> > Right now I've been managing situation with crutches like:
> >
> > when: foo_list|join('') != ''
> >
> > but that is non-descriptive and hackish IMO. Is there an interest of
> adding
> > this feature? Shall I post into Github issue tracker?
> >
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> Brian Coca
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Matt Martz
@sivel
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