Display / Proc.
foreign_table_fieldis the field of the child record pointing to the parent record. This defines where to store the table name of the parent record. On setting this configuration key together with foreign_field, the child record knows what its parent record is – so the child record could also be used on other parent tables. This issue is also known as "weak entity". Do not confuse with foreign_table or foreign_field. It has its own behavior.