Never file a part marker under its own PC

tests/test_core/test_collector_contract.py

@@ -1008,3 +1008,41 @@ def test_an_ordinary_pc_gets_no_marker(
                       'pctype': 'gea-shopfloor-collections'},
                 headers={'X-API-Key': collector_key})
     assert Asset.query.filter(Asset.assetnumber.like('%-PARTMARKER')).all() == []
+
+
+def test_a_marker_is_never_filed_under_its_own_pc(
+        client, db, collector_key, computer_assettype, machine_3015):
+    """A PC first seen before the machine-number fix was created with the
+    machine number as its OWN asset number, and that is never overwritten. So
+    resolving the number can return the PC itself, and filing the marker partof
+    its own PC reads on the machine page as the PC being the operation."""
+    from shopdb.core.models import Asset, AssetRelationship, RelationshipType
+    from plugins.computers.models import Computer
+
+    db.session.add(RelationshipType(relationshiptype='partof',
+                                    isdirectional=True))
+    db.session.commit()
+
+    # A legacy PC: its own asset carries the machine number, and no separate
+    # asset for the operation exists.
+    client.post('/api/collector/computers',
+                json={'hostname': 'LEGACYPC',
+                      'pctype': 'gea-shopfloor-partmarker'},
+                headers={'X-API-Key': collector_key})
+    comp = Computer.query.filter(Computer.hostname.ilike('LEGACYPC')).first()
+    comp.asset.assetnumber = '0615'
+    db.session.commit()
+
+    r = client.post('/api/collector/computers',
+                    json={'hostname': 'LEGACYPC', 'machinenumber': '0615',
+                          'pctype': 'gea-shopfloor-partmarker'},
+                    headers={'X-API-Key': collector_key})
+
+    partof = RelationshipType.query.filter_by(relationshiptype='partof').first()
+    links = AssetRelationship.query.filter_by(
+        relationshiptypeid=partof.relationshiptypeid, isactive=True).all()
+    targets = [db.session.get(Asset, rel.targetassetid).assetid
+               for rel in links]
+    assert comp.assetid not in targets, 'marker filed under its own PC'
+    assert any("own asset number" in w
+               for w in r.get_json()['data']['warnings'])