Application Delivery Management

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December 31, 2023

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If you are using nested components, you can refer to the parent component using the $parent notation. If the parent component builds multiple configuration objects using the repeat construct, and within each iteration, child components build other configuration objects, then the $parent notation always refers to the current iteration of the parent component. For example, $parent.properties.name refers to the name property of the configuration object built in the current iteration by the parent.

Example:

components:
 -
   name: my-lbvserver-comp
   type: ns::lbvserver
   properties:
     name: $parameters.name + "-lb"
     servicetype: HTTP
     ipv46: $parameters.ip
     port: 80
     lbmethod: $parameters.lb-alg
     components:
       -
         name: my-svcg-comp
         type: ns::servicegroup
         properties:
           name: $parameters.name + "-svcgrp"
           servicetype: HTTP
           components:
            -
              name: lbvserver-svg-binding-comp
              type: ns::lbvserver_servicegroup_binding
              properties:
                 name: $parent.parent.properties.name
                 servicegroupname: $parent.properties.name
                   -
                     name: members-svcg-comp
                     type: ns::servicegroup_servicegroupmember_binding
                     repeat: $parameters.svc-servers
                     repeat-item: srv
                     properties:
                       ip: $srv
                       port: str($parameters.svc-port)
                       servicegroupname: $parent.properties.name
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You can also navigate upward through the hierarchy of components by accessing the properties of the parents of parents all the way to top-level components. For example, the property name of the component lbvserver-svg-binding-comp takes its value from the property name of the parent of its parent, the my-lbvserver-comp component, by using the $parent.parent notation.

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Parent reference

December 31, 2023

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December 31, 2023

Contributed by:

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