Whenever you try to raname class of edges, it's objects looses their chain of inheritance.

[habi4ek]

create class testV1 extends V
Class created successfully. Total classes in database now: 12

create class testV2 extends V
Class created successfully. Total classes in database now: 13

insert into testV1 CONTENT {"name":"vertex1"}
Inserted record 'testV1#12:0{name:vertex1} v1' in 0,069000 sec(s).

insert into testV2 CONTENT {"name":"vertex2"}
Inserted record 'testV2#13:0{name:vertex2} v1' in 0,055000 sec(s).

create class edgeClass extends E
Class created successfully. Total classes in database now: 14

create class oldNameEdge extends edgeClass
Class created successfully. Total classes in database now: 15

create edge oldNameEdge from #12:0 to #13:0
Created edge '[oldNameEdge#15:0{out:#12:0,in:#13:0} v3]' in 0,067000 sec(s).

test query

select expand(outE('E')) from #12:0

----+-----+-----------+-----+-----

|@Rid |@Class |out |in

----+-----+-----------+-----+-----
0 |#15:0|oldNameEdge|#12:0|#13:0
----+-----+-----------+-----+-----
1 item(s) found. Query executed in 0.057 sec(s).

rename class "oldNameEdge"

alter class oldNameEdge name newNameEdge
Class updated successfully

test query againe

select expand(outE('E')) from #12:0
0 item(s) found. Query executed in 0.056 sec(s).

but

select expand(outE()) from #12:0
----+-----+-----------+-----+-----

|@Rid |@Class |out |in

----+-----+-----------+-----+-----
0 |#15:0|newNameEdge|#12:0|#13:0
----+-----+-----------+-----+-----
1 item(s) found. Query executed in 0.057 sec(s).

create new edge in renamed class

create edge newNameEdge from #12:0 to #13:0
Created edge '[newNameEdge#15:1{out:#12:0,in:#13:0} v3]' in 0,058000 sec(s).

test query againe

select expand(outE('E')) from #12:0
----+-----+-----------+-----+-----

|@Rid |@Class |out |in

----+-----+-----------+-----+-----
0 |#15:1|newNameEdge|#12:0|#13:0
----+-----+-----------+-----+-----
1 item(s) found. Query executed in 0.056 sec(s).

but

select expand(outE()) from #12:0
----+-----+-----------+-----+-----

|@Rid |@Class |out |in

----+-----+-----------+-----+-----
0 |#15:0|newNameEdge|#12:0|#13:0
1 |#15:1|newNameEdge|#12:0|#13:0
----+-----+-----------+-----+-----
2 item(s) found. Query executed in 0.056 sec(s).

but

select expand(outE('oldNameEdge')) from #12:0
----+-----+-----------+-----+-----

|@Rid |@Class |out |in

----+-----+-----------+-----+-----
0 |#15:0|newNameEdge|#12:0|#13:0
----+-----+-----------+-----+-----
1 item(s) found. Query executed in 0.057 sec(s).

but

select from oldNameEdge
Error: com.orientechnologies.orient.core.exception.OQueryParsingException: Error on parsing query
Query: oldNameEdge
------^
Error: com.orientechnologies.orient.core.exception.OCommandExecutionException: Class 'OLDNAMEEDGE' w
as not found in current database

[tglman]

Hi, this is a bug in 2.0.6 but is already fixed in 2.1, so i'm closing it. reopen it if you need this to back ported.