default <FK_ENTITY> FindFrom<FK_ENTITY, ENTITY> finderBy(
        HasFinder<FK_ENTITY, ENTITY> fkField) {

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

@param <FK_ENTITY> the type of the foreign entity

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

@see #finderByNullable(HasNullableFinder)
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/manager/Manager.java