Incorrect error string returned for missing vertex collections

[ex-nerd]

Attempting to insert an edge referencing a missing vertex returns an an error that the edge collection is missing, rather than that the vertex is missing.

My Environment

• ArangoDB Version: 3.6.1 via official docker
• Storage Engine: whatever is default
• Deployment Mode: single
• Deployment Strategy: official docker via manual command in docker-composearangodb --starter.mode=single --starter.data-dir=/opt/arangodb --starter.address=0.0.0.0
• Configuration: nothing special
• Infrastructure: docker-compose local development
• Operating System: whatever is in your docker image
• Total RAM in your machine: 32Gb but only 4GB allocated to docker
• Disks in use: SSD
• Used Package: nope

Component, Query & Data

Originally thought this was a bug in python arango filed here but it seems this message is coming straight from arangodb. Requoted here with edits based on new info:

Given a graph G that links V_DOCS to itself via edge collection EDGE_DOCS, I accidentally typo'd my link statement in something that looks roughly like this:

# using python-arango
from arango.database import StandardDatabase
db: StandardDatabase = client.db(repo_name, username, password)
g: Graph = db.graph("G")
edges: EdgeCollection = g.edge_collection("EDGE_DOCS")
edges.insert({"_key": "something", "_from": "V_TYPO/1234", "_to": "V_DOCS/3456"})

The error returned looks like this:

arango.exceptions.DocumentInsertError: [HTTP 404][ERR 1203] collection 'EDGE_DOCS' not found

Certainly EDGE_DOCS exists ... what the error should have been telling me is that the vertex referencing V_TYPO doesn't exist.

I originally assumed this was something in python-arango simply receiving a 404 from arangodb and filling in the EDGE_DOCS collection name on its own, but its author assures me that the error is returned verbatim from arangodb.

Steps to reproduce

Described above.

Problem:

Attempting to insert an edge referencing a missing vertex returns an an error that the edge collection is missing, rather than that the vertex is missing.

Expected result:

The error returned should reference the missing vertex, not the edge collection (which does exist).