samples revisited after teched

packages/common-contacts/db/code-lists.cds

@@ -0,0 +1,37 @@
+using { sap.capire.contacts.PostalAddress } from './schema';
+using { sap } from '@sap/cds/common';
+namespace sap.capire.contacts;
+
+/**
+ * The Code Lists below are designed as optional extensions to
+ * the base schema. Switch them on by adding an Association to
+ * one of the code list entities in your models or by:
+ * annotate sap.common.Countries with @cds.persistence.skip:false;
+ */
+
+entity Countries as select from sap.common.Countries;
+extend sap.common.Countries {
+  regions   : Composition of many Regions on regions._parent = $self.code;
+}
+entity Regions : sap.common.CodeList {
+  key code : String(5); // ISO 3166-2 alpha5 codes, e.g. DE-BW
+  children  : Composition of many Regions on children._parent = $self.code;
+  cities    : Composition of many Cities on cities.region = $self;
+  _parent   : String(11);
+}
+entity Cities : sap.common.CodeList {
+  key code  : String(11);
+  region    : Association to Regions;
+  districts : Composition of many Districts on districts.city = $self;
+}
+entity Districts : sap.common.CodeList {
+  key code  : String(11);
+  city      : Association to Cities;
+}
+
+annotate PostalAddress with {
+  district @ref: sap.capire.contacts.Districts;
+  city @ref: sap.capire.contacts.Cities;
+  region @ref: sap.capire.contacts.Regions;
+  country @ref: sap.capire.contacts.Countries;
+}