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Extend webhook payload body to include related objects. #10862
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opened 2025-12-29 21:36:53 +01:00 by adam
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Reference: starred/netbox#10862
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Originally created by @sol1-matt on GitHub (Mar 10, 2025).
NetBox version
v4.2.4
Feature type
Change to existing functionality
Proposed functionality
The webhook object data payload sent is currently "equivalent to the model's representation in NetBox's REST API". The Netbox API for related objects is a stub usually containing id, name, display, slug, etc...
The proposed functionality is to extend the data available to the payload to include everything in the linked objects.
This feature is useful as it removes the need to, potentially, make multiple api calls, or a graphQL call, by an external system once it receives a webhook event to gather linked data.
Note: I say multiple api calls here because Netbox objects, in particular device and vm, have multiple linked objects
This is different from #16549 in that #16549 aims to create a condition for the webhook event being triggered based on the linked objects where as this feature request aims to make the linked object available as part of the data to send in the payload after the webhook event is triggered.
Use case
Use case 1
Sending shipping information when a device is ready for deployment.
A webhook is created that feeds into a automatic ticketing system when a device status changes alerting another team they need to deploy said device to a specific location. Adding the address details for device to the ticket would remove the need for a person to look up this info.
Note: When we did this the receiver of these tickets didn't have access to our Netbox so a human looking it up wasn't a option, the address details had to be included at ticket creation.
Use case 2
Synchronizing multiple Netbox objects with an external system.
If a device modifies its site the webhook for device is triggered sending a payload that includes the device and stub of site. The site could already exist in the external system but it wouldn't know because the
site.custom_fieldsfor the unique ID the external system isn't passed across with the device. The external system requires an api call each webhook to make sure the site exists.If the payload did include the full site details then the external system would be able to verify the site exists because the
site.custom_fieldsfor the unique ID does exist or create it if it doesn't exist.Database changes
None
External dependencies
None
@jeremystretch commented on GitHub (Mar 13, 2025):
To clarify, the proposal is to extend the serialized representation of the primary object to include a complete (rather than partial) representation of each related object? For example, a site is currently serialized in the webhook payload as:
Example
The proposal here would extend
tenantto its complete representation, e.g.Example
This may be feasible now that we have flexible nested serializers in place (as of v4.0, IIRC). However, we'll need to consider the performance impact of querying for the related objects beyond the first degree of relations.
@sol1-matt commented on GitHub (Mar 14, 2025):
Correct @jeremystretch. Our specific use case is use case 2, to get the custom fields from a site when a device is updated.
I agree it needs thought.
If you just did first child then you aren't going have the children of children, but is that a problem?
eg: In the first child example below we don't have the full
tenant.groupand I can't see an argument for needing it because groups don't really have many fields.If the nested groups are followed what is the cost and could we get into the situation where we create a loop.
First child example
I'll put some time in to see if I can find example where children beyond the first child provide more information.
One thought I had when looking at this problem originally was "it would be nice if we could specify the object we send using something like graphQL".
@sol1-matt commented on GitHub (Mar 20, 2025):
Cable terminations have nested results related to the termination itself. The termination object contains both a device and cable.
Cable Termination example
Cables also have deeply nested objects. A termination has a linked object.
Cable example
If the option to improve webhooks is to load first level objects only then perhaps a good definition of first level would be
any object that is referenced in the original objects "equivalent to the model's representation in NetBox's REST API"
@ravenrs commented on GitHub (Jul 4, 2025):
@jeremystretch could you please assign this issue to me, I think it's very usefull for everyone as for me, because now I want to send updates to external system only when device's tenant of interface equals to specific one, it will drop huge amount of unnecessary data. I want to try make it by "field" attribute of nasted dict, I don't think that we a relly need to get all serialized data of child object, but if we have path in condition, for example for my case it will be - device.tenant.name it can add only needed info for device serializer and brief for tenant or exactly value by path - device.tenant.name ( need to think about it). So I think it will be used the same approach, to add additional information to webhook by body template extend.