code: public ExtendedRelation addRelationship(String baseTableName,
  			UserRelatedTable relatedTable, String mappingTableName) {
  		return addRelationship(baseTableName, relatedTable,
  				relatedTable.getRelationName(), mappingTableName);
  	}
docs: Adds a relationship between the base and user related table. Creates a
  default user mapping table and the related table if needed.
  
  @param baseTableName
  base table name
  @param relatedTable
  user related table
  @param mappingTableName
  user mapping table name
  @return The relationship that was added