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Update JSON Query filter examples (#42432) (#43491)

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* Update JSON Query filter examples

Correct syntax on one example
Add more examples of escaping
Change example to show joining list to string

(cherry picked from commit 7b0dea45e9)
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Alicia Cozine 2018-07-31 10:17:23 -05:00 committed by GitHub
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35
docs/docsite/rst/user_guide/playbooks_filters.rst
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@ -288,40 +288,51 @@ Now, let's take the following data structure::
To extract all clusters from this structure, you can use the following query::
- name: "Display all cluster names"
debug: var=item
loop: "{{domain_definition|json_query('domain.cluster[*].name')}}"
debug:
var: item
loop: "{{ domain_definition | json_query('domain.cluster[*].name') }}"
Same thing for all server names::
- name: "Display all server names"
debug: var=item
loop: "{{domain_definition|json_query('domain.server[*].name')}}"
debug:
var: item
loop: "{{ domain_definition | json_query('domain.server[*].name') }}"
This example shows ports from cluster1::
- name: "Display all server names from cluster1"
debug: var=item
loop: "{{domain_definition|json_query(server_name_cluster1_query)}}"
- name: "Display all ports from cluster1"
debug:
var: item
loop: "{{ domain_definition | json_query(server_name_cluster1_query) }}"
vars:
server_name_cluster1_query: "domain.server[?cluster=='cluster1'].port"
.. note:: You can use a variable to make the query more readable.
Or, alternatively::
Or, alternatively print out the ports in a comma separated string::
- name: "Display all server names from cluster1"
- name: "Display all ports from cluster1 as a string"
debug:
var: item
loop: "{{domain_definition|json_query('domain.server[?cluster=`cluster1`].port')}}"
msg: "{{ domain_definition | json_query('domain.server[?cluster==`cluster1`].port') | join(', ') }}"
.. note:: Here, quoting literals using backticks avoids escaping quotes and maintains readability.
Or, using YAML `single quote escaping <http://yaml.org/spec/current.html#id2534365>`_::
- name: "Display all ports from cluster1"
debug:
var: item
loop: "{{ domain_definition | json_query('domain.server[?cluster==''cluster1''].port') }}"
.. note:: Escaping single quotes within single quotes in YAML is done by doubling the single quote.
In this example, we get a hash map with all ports and names of a cluster::
- name: "Display all server ports and names from cluster1"
debug:
var: item
loop: "{{domain_definition|json_query(server_name_cluster1_query)}}"
loop: "{{ domain_definition | json_query(server_name_cluster1_query) }}"
vars:
server_name_cluster1_query: "domain.server[?cluster=='cluster2'].{name: name, port: port}"