[bug #18938] Wrong nullify in ToMany relationship

[Manuel Guesdon]

URL:
  <http://savannah.gnu.org/bugs/?18938>

                 Summary: Wrong nullify in ToMany relationship
                 Project: GNUstep
            Submitted by: mguesdon
            Submitted on: vendredi 02.02.2007 à 19:36
                Category: gdl2
                Severity: 4 - Important
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Having 2 entities like this:
                {
                        attributes = (
                                        {
                                                columnName = code;
                                                externalType = int4;
                                                name = code;
                                                valueClassName = NSNumber;
                                                valueType = i;
                                                allowsNull = N;
                                        },
                                    );
                        attributesUsedForLocking = (code);
                        classProperties = (code,toEntity2);
                        externalName = entity1;
                        primaryKeyAttributes = (code);
                        name = Entity1;
                        className=Entity1;
                    relationships = (
                                                {
                                                        destination = Product;
                                                        joinSemantic = 
EOInnerJoin; 
                                                        isToMany = Y;
                                                        isMandatory = N; 
                                                        isBidirectional = Y;

                                                        joins = (
                                                                           {
                                                                                
destinationAttribute = foreignCode;
                                                                                
joinOperator = EOJoinEqualTo; 
                                                                                
joinSemantic = EOInnerJoin; 
                                                                                
sourceAttribute = code;
                                                                            }
                                                                    ); 
                                                        name = toEntity2;
                                                }
                                                ); 
                }
















                        {
                        attributes = (
                                        {
                                                columnName = code;
                                                externalType = int4;
                                                name = code;
                                                valueClassName = NSNumber;
                                                valueType = i;
                                                allowsNull = N;
                                        },
                                        {
                                                columnName = foreign_code;
                                                externalType = int4;
                                                name = foreignCode;
                                                valueClassName = NSNumber;
                                                valueType = i;
                                                allowsNull = Y;
                                                userDictionary = { 
isUserNotNull = YES; min=1; max=INT_MAX; };
                                        }
                                     );
                        attributesUsedForLocking = (code);
                        classProperties = (code,foreignCode,toEntity1);
                        externalName = entity2;
                        name = Entity2;
                        className=Entity2;
                        primaryKeyAttributes = (code);
                    relationships = (
                                                        {
                                                        destination = Entity1;
                                                        joinSemantic = 
EOInnerJoin; 
                                                        isToMany = N;
                                                        isMandatory = N; 
                                                        isBidirectional = Y;

                                                        joins = (
                                                                                
{
                                                                                
destinationAttribute = code;
                                                                                
joinOperator = EOJoinEqualTo; 
                                                                                
joinSemantic = EOInnerJoin; 
                                                                                
sourceAttribute = foreignCode;
                                                                            }
                                                                            ); 
                                                        name = toEntity1;
                                                        }
                                                );
                }




For an existing Entity2 object having a toEntity1 relationship to ObjectA,
changing this relationship to ObjectB sometimes save NULL in  foreignCode
instead of ObjectB code.
This append when update are propagated first with objectB as sourceObject (it
assign the objectB value to foreignCode) and _next_ with objectA (which
nullify foreignCode).
If propagation first take objectA and next objectB, there's no problem.

The nullify operation is done in In EODatabaseContext
-nullifyAttributesInRelationship:sourceObject:destinationObject:

Any idea on this ? Should we firs apply all nullify operations and next all
relay operations ?

Manuel








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