jinja2 nested variables

Question

I am currently learning jinja2 and i am unsure on how to address variables the correct way:

Here are my variables in yaml:

---
hosts:
   app201.acme.com: {eth0: {ip: 46.0.0.1, netmask: 255.255.255.255}}
   graphite.acme.com: {eth0: {ip: 46.0.0.2, netmask: 255.255.255.255},
                       eth0.1: {ip: 10.2.90.1, netmask: 255.255.255.255}}

and here the jinja2 template:

{{ fqdn }}
{% for interface in hosts[fqdn] %}
    {{ interface }}
    {{ hosts[fqdn].interface.ip }} << doesn't work
    {{ hosts[fqdn].{{ interface }}.ip }} << doesn't work
    {{ interface.ip }} << doesn't work
{% endfor %}

so currently my output looks like this since I can't access second dimension of yaml hash.

graphite.acme.com eth0.1

eth0

Vikas · Accepted Answer · 2015-05-18 19:55:12Z

21

The variable hosts is a dict. The correct way to access values in dict is to use [] operator.

{{ fqdn }}
{% for interface in hosts[fqdn] %}
    {{ interface }}
    {{ hosts[fqdn][interface]['ip'] }}
{% endfor %}

. operator is used to access attribute of an object.

edited May 18, 2015 at 19:55

answered Jun 5, 2012 at 9:42

Vikas

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4 Comments

Vikas Over a year ago

@user1436955, most welcome. You can mark it as an answer if you think this is what you were looking for.

Mateusz M. Over a year ago

Interestingly interface['ip'] doesn't seem to work, I guess since interface is treated as a string, not dict.

Vikas Over a year ago

@MateuszM. thanks for pointing out. It was copy pasted from OP's code snippet and I forgot removing.

Mahmoud Magdy Over a year ago

{{form.fullName(class='form-control', value={{x}}, placeholder="FirstName LastName") }} how to add the x value for flask wtf form that come from server

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