AtkManyToOneRelation
From Achievo/ATK Wiki
atkManyToOneRelation
If you do not want to use the default primary keys (for example when the * side has a combined PK), you can override them by using the functions:
setLocalKey("a_id"); setRemoteKey("b_id");
Example
Projects all have one coordinator (node B), but one coordinator can have multiple projects (node A). So in the project class, there's a atkManyToOneRelation to a coordinator.
When you use the AF_LARGE flag it is possible to customise the text for the select link, See Renaming_'add'_and_'select'_links_in_relations.
Example atkMetaNode
An Employee has one department
public static function meta(atkMetaPolicy $policy) {
$policy->hasOne('department');
}

