How can I refer to the name of the connected device on an interface?

[whtkam]

Is it possible to reference the connected endpoint device in a jinja2 template on an interfaces.

Template:
hostname {{ device.name }}
!
{% for interface in device.interfaces.all() %}
interface {{ interface }}
Connected-endpoint {{ interface.connected_endpoints.0}}
{% endfor %}

Rendered Config:
hostname MGMT-SW1
!
interface GigabitEthernet0/0 (GigabitEthernet0/0)
Connected-endpoint eth0 (ethernet0)

I only got the interface back but not the device name
What is the correct reference to get the device name of the connected device. In this example it should be "R2"

REST-API - JSON of the interface

  "connected_endpoints": [
    {
      "id": 50,
      "url": "https://192.168.0.1/api/dcim/interfaces/50/",
      "display": "eth0 (ethernet0)",
      "device": {
        "id": 8,
        "url": "https://192.168.0.1/api/dcim/devices/8/",
        "display": "R2",
        "name": "R2"
      },
      "name": "eth0",
      "cable": 5,
      "_occupied": true
    }

Thanks in advance!

[peterbaumert]

interface.connected_endpoints.0.device.name

[whtkam]

I already tried that but it didn't work

Template

hostname {{ device.name }}
!
{% for interface in device.interfaces.all() %}
interface {{ interface }}
Connected-endpoint {{ interface.connected_endpoints.0}}
Connected-endpoint {{ interface.connected_endpoints.0.device.name }}
{% endfor %}

Rendered Config

Traceback (most recent call last):
File "/opt/netbox/netbox/dcim/views.py", line 2075, in get_extra_context
rendered_config = config_template.render(context=context_data)
File "/opt/netbox/netbox/extras/models/configs.py", line 252, in render
output = template.render(**context)
File "/opt/netbox/venv/lib/python3.8/site-packages/jinja2/environment.py", line 1301, in render
self.environment.handle_exception()
File "/opt/netbox/venv/lib/python3.8/site-packages/jinja2/environment.py", line 936, in handle_exception
raise rewrite_traceback_stack(source=source)
File "", line 6, in top-level template code
File "/opt/netbox/venv/lib/python3.8/site-packages/jinja2/sandbox.py", line 326, in getattr
value = getattr(obj, attribute)
jinja2.exceptions.UndefinedError: list object has no element 0

[peterbaumert]

That looks like one of your interfaces doesnt have something connected. You need to either check with if or use jinja default.

[whtkam]

That's it! -> Thank you very very much!