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Using "~" instead of "+" for concatination (#74364)

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Changed FAQ examples to conform with the Jinja documentation:
If both values on either side of a plus/+ are numbers, they will be added whereas using "~" will convert all operands into strings and then concatenate them. Closes #73799.
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Hublerho 2021-04-23 19:44:09 +02:00 committed by GitHub
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10
docs/docsite/rst/reference_appendices/faq.rst
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@ -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: