@ -424,11 +424,11 @@ How do I access a variable name programmatically?
+++++++++++++++++++++++++++++++++++++++++++++++++
An example may come up where we need to get the ipv4 address of an arbitrary interface, where the interface to be used may be supplied
via a role parameter or other input. Variable names can be built by adding strings together, like so:
via a role parameter or other input. Variable names can be built by adding strings together using "~" , like so:
.. code-block :: jinja
{{ hostvars[inventory_hostname]['ansible_' + which_interface]['ipv4']['address'] }}
{{ hostvars[inventory_hostname]['ansible_' ~ which_interface]['ipv4']['address'] }}
The trick about going through hostvars is necessary because it's a dictionary of the entire namespace of variables. `` inventory_hostname ``
is a magic variable that indicates the current host you are looping over in the host loop.
@ -437,7 +437,7 @@ In the example above, if your interface names have dashes, you must replace them
.. code-block :: jinja
{{ hostvars[inventory_hostname]['ansible_' + which_interface | replace('_', '-') ]['ipv4']['address'] }}
{{ hostvars[inventory_hostname]['ansible_' ~ which_interface | replace('_', '-') ]['ipv4']['address'] }}
Also see dynamic_variables_.
@ -681,13 +681,13 @@ The above DOES NOT WORK as you expect, if you need to use a dynamic variable use
.. code-block :: jinja
{{ hostvars[inventory_hostname]['somevar_' + other_var] }}
{{ hostvars[inventory_hostname]['somevar_' ~ other_var] }}
For 'non host vars' you can use the :ref: `vars lookup<vars_lookup>` plugin:
.. code-block :: jinja
{{ lookup('vars', 'somevar_' + other_var) }}
{{ lookup('vars', 'somevar_' ~ other_var) }}
.. _why_no_wheel: