How do I filter a collection in a jinja2 template ?

Question

I have a collection of namedtuples which looks like this :

[('mountpoint=X',state='UP'),(mountpoint='Y',state='DOWN'),(mountpoint='Z',state='DOWN'...)]

I pass this collection to one of my templates. I'd like to filter that collection based on state. Tried the following to no avail

  {% for state in states|selectattr('state','down') %}
TemplateRuntimeError: no test named 'down'

  {% for state in states|selectattr(state='down') %}
FilterArgumentError: Missing parameter for attribute name

  {% for state in states|select(state='down') %}
No error, but doesn't filter at all.

vaultah · Accepted Answer · 2016-01-24T10:47:42.893

2

Use the equalto test:

{% for state in states|selectattr('state', 'equalto', 'down') %}

edited Jan 24 '16 at 10:47

answered Jan 24 '16 at 10:42

vaultah

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`{% for state in states|selectattr("state","equalto","DOWN") %}` -> `TemplateRuntimeError: no test named 'equalto'` – ychaouche Jan 24 '16 at 10:46
Maybe a problem of jinja2 version then. I have 2.7.3 – ychaouche Jan 24 '16 at 10:51
1

@ychaouche: it was added in Jinja 2.8. – vaultah Jan 24 '16 at 10:51
Tried the "sameas" test in jinja2.7.3 which, for this special case, works fine because I'm comparing strings ? – ychaouche Jan 24 '16 at 10:54
@ychaouche: this means that strings were [cached](http://stackoverflow.com/q/1504717/2301450). You shouldn't rely on that behaviour. – vaultah Jan 24 '16 at 10:56

How do I filter a collection in a jinja2 template ?

1 Answers1