default <FK_ENTITY> BackwardFinder<FK_ENTITY, ENTITY> finderBackwardsBy(
        HasFinder<ENTITY, FK_ENTITY> fkField) {

        return fkField.backwardFinder(getTableIdentifier(), this::stream);
    }
Returns a Function that, when it is applied, will produce an equivalent
result as if {@link #findBackwardsBy(HasFinder, Object)} was called.

@param <FK_ENTITY> the type of the foreign entity

@param fkField the foreign key field
@return an Entity (if any) that matches the given a foreign key relation
(foreign field and entity)

@see #findBackwardsBy(HasFinder, Object)
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/manager/Manager.java