diff --git a/docsite/rst/playbooks_filters.rst b/docsite/rst/playbooks_filters.rst index cff5314e2b..01c1a3ef2d 100644 --- a/docsite/rst/playbooks_filters.rst +++ b/docsite/rst/playbooks_filters.rst @@ -211,6 +211,71 @@ Square root, or the 5th:: Note that jinja2 already provides some like abs() and round(). +.. json_query_filter: + +JSON Query Filter +----------------- + +Sometimes you end up with complex data structure in JSON format and you need to extract only a small set of data within it. A **json_query** filter lets you query a complex JSON structure and iterate over it using a with_items structure. + +.. note:: This filter is built upon **jmespath**, and you can use the same syntax. For examples, see `jmespath examples `_. + +Now, let's take the following data structure:: + + domain_definition: + domain: + cluster: + - name: "cluster1" + - name: "cluster2" + server: + - name: "server11" + cluster: "cluster1" + port: "8080" + - name: "server12" + cluster: "cluster1" + port: "8090" + - name: "server21" + cluster: "cluster2" + port: "9080" + - name: "server22" + cluster: "cluster2" + port: "9090" + library: + - name: "lib1" + target: "cluster1" + - name: "lib2" + target: "cluster2" + +To extract all clusters from this structure, you can use the following query:: + + - name: "Display all cluster names" + debug: var=item + with_items: "{{domain_definition|json_query('domain.cluster[*].name')}}" + +Same things for all server names:: + + - name: "Display all server names" + debug: var=item + with_items: "{{domain_definition|json_query('domain.server[*].name')}}" + +This example shows ports from cluster1:: + + - name: "Display all server names from cluster1" + debug: var=item + with_items: "{{domain_definition|json_query(server_name_cluster1_query)}}" + vars: + server_name_cluster1_query: "domain.server[?cluster=='cluster1'].port" + +.. note:: You must use a variable in order to use quotes in your query. + +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 + with_items: "{{domain_definition|json_query(server_name_cluster1_query)}}" + vars: + server_name_cluster1_query: "domain.server[?cluster=='cluster2'].{name: name, port: port}" + .. _ipaddr_filter: IP address filter