Restart required to view new Relationship in GraphQL

Environment

• Python version: 3.8.5
• Nautobot version: 1.0.1

Steps to Reproduce

1. Create a new Relationship e.g. between dcim.device and ipam.vlan called device_vlan
2. Go to the GraphiQL interface
3. Query for all devices and include the relationship attribute created in step 1 e.g.

{
  devices{
    rel_device_vlan {
      id
    }
  }
}

Expected Behavior

The relationship attribute (e.g. rel_device_vlan) is available for selection the GraphIQL interface and is processed and values returned as part of the query.

Observed Behavior

The relationship attribute (e.g. rel_device_vlan) is not available on the models as per definition. If the relationship attribute is entered into the query without predictive text, the error below is reported.

The nautobot service needs to be restarted for the relationship to be loaded and be available for querying.

{
  "errors": [
    {
      "message": "Cannot query field \"rel_device_vlan\" on type \"DeviceType\".",
      "locations": [
        {
          "line": 37,
          "column": 5
        }
      ]
    }
  ]
}

[glennmatthews]

Probably also an issue with other “dynamic” schema content - custom fields, computed fields in particular.

[glennmatthews]

Note that the test case test_query_relationship_associations in nautobot/core/tests/test_graphql.py (added by #1230) is currently skipped due to this issue. When this issue is fixed, that test case should be re-enabled and validated.