[master] Bug 391279: Fix usecase with existing FK mapping

[dazey3]

for #233

The original 391279 did not account for the usecase of an existing foreign key mapping on the owning side and instead expected the FK would be added by the @joincolumn. This results in an exception similar to this:

Execute query InsertObjectQuery(model.CommentC@378deffb)
INSERT INTO COMMENTC (COMPLEXID_C_A, CONTENT, COMPLEXID_C_A, TYPE) VALUES (?, ?, ?, ?)
Internal Exception: java.sql.SQLSyntaxErrorException: Column name 'COMPLEXID_C_A' appears more than once times in the column list of an INSERT statement. 

The issue is due to the use of ObjectBuilder.buildRow(AbstractRecord databaseRow, Object object, AbstractSession session, WriteType writeType) in OneToManyMapping. This method calls DatabaseMapping.writeFromObjectIntoRow(Object object, AbstractRecord row, AbstractSession session, WriteType writeType), which adds to the given row, causing duplicates.

Signed-off-by: Will Dazey dazeydev.3@gmail.com

[lukasj]

LGTM

[dazey3]

@lukasj thanks for the reviews!