Jinja2 template variables to one line

Question

Is it possible to create a jinja2 template that puts variables on one line? Something like this but instead of having two lines in the results have them comma separated.

Template:

{% for host in groups['tag_Function_logdb'] %}
elasticsearch_discovery_zen_ping_unicast_hosts = {{ host }}:9300
{% endfor %}

Results:

elasticsearch_discovery_zen_ping_unicast_hosts = 1.1.1.1:9300
elasticsearch_discovery_zen_ping_unicast_hosts = 2.2.2.2:9300

Desired Results:

elasticsearch_discovery_zen_ping_unicast_hosts = 1.1.1.1:9300,2.2.2.2:9300

Edit, this works for 2 items, better solution below:

elasticsearch_discovery_zen_ping_unicast_hosts = {% for host in groups['tag_Function_logdb']  %}
{{ host }}:9300
{%- if loop.first %},{% endif %}
{% endfor %}

Possible duplicate of [How to output a comma delimited list in jinja python template?](http://stackoverflow.com/questions/11974318/how-to-output-a-comma-delimited-list-in-jinja-python-template) — nelsonda, May 18 '17 at 13:26
"this works" is not correct (or, only correct for two items) - please re-edit "this works for two items" — Gedge, Oct 08 '19 at 12:41

score 15 · Accepted Answer · edited Jun 21 '20 at 20:28

15

Here's the solution that worked for me. I discovered that tweeks200's solution only works for 2 loops. This works regardless of the number of loops. Thanks to everyone here for the help.

elasticsearch_discovery_zen_ping_unicast_hosts={% for host in groups['tag_Function_logdb']  %}
{{ host }}:9300
{%- if not loop.last %},{% endif %}
{% endfor %}

edited Jun 21 '20 at 20:28

Garrett Hyde

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answered Feb 08 '17 at 05:00

James Saint-Rossy

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score 3 · Answer 2 · answered Jun 28 '16 at 14:10

3

I was able to get this working by putting the directive I wanted before loop and then using the loop.first and - whitespace control to format the comma separated list properly.

elasticsearch_discovery_zen_ping_unicast_hosts = {% for host in groups['tag_Function_logdb']  %}
{{ host }}:9300
{%- if loop.first %},{% endif %}
{% endfor %}

answered Jun 28 '16 at 14:10

tweeks200

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The check should be `if not loop.last` or it would not work for loop bigger than 2 elements. – ElementalStorm Nov 12 '19 at 11:05

score 2 · Answer 3 · answered Jun 28 '16 at 13:09

2

Here's how you can do it:

elasticsearch_discovery_zen_ping_unicast_hosts = &nbsp;

 {% for host in groups['tag_Function_logdb']  %}

    {{ host }}:9300

    {% if not groups['tag_Function_logdb'].last %}
, 
    {% endif %}

{% endfor %}

answered Jun 28 '16 at 13:09

dmitryro

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Thanks, making some progress. The `elasticsearch_discovery_zen_ping_unicast_hosts = ` is not being populated and instead just showing as text. Should that be in part of the loop somehow? – tweeks200 Jun 28 '16 at 13:53

Jinja2 template variables to one line

3 Answers3