...

orders/db/schema.cds

@@ -1,23 +1,2 @@
-using { Currency, User, managed, cuid } from '@sap/cds/common';
-using from '@capire/common';
-namespace sap.capire.orders;
-
-entity Orders : cuid, managed {
-  OrderNo  : String @title:'Order Number'; //> readable key
-  Items    : Composition of many {
-    key ID    : UUID;
-    @assert.integrity:false // REVISIT: this is a temporary workaround for a glitch in cds-runtime
-    product   : Association to Products;
-    amount    : Integer;
-    title     : String;
-    price     : Double;
-  };
-  buyer    : User;
-  currency : Currency;
-}
-
-/** This is a stand-in for arbitrary ordered Products */
-@cds.persistence.skip:'always'
-entity Products {
-  key ID : String;
-}
+// using from './without-managed-composition/schema';
+using from './with-managed-composition/schema';

orders/db/with-managed-composition/schema.cds

@@ -0,0 +1,23 @@
+using { Currency, User, managed, cuid } from '@sap/cds/common';
+using from '@capire/common';
+namespace sap.capire.orders;
+
+entity Orders : cuid, managed {
+  OrderNo  : String @title:'Order Number'; //> readable key
+  Items    : Composition of many {
+    key ID    : UUID;
+    @assert.integrity:false // REVISIT: this is a temporary workaround for a glitch in cds-runtime
+    product   : Association to Products;
+    amount    : Integer;
+    title     : String;
+    price     : Double;
+  };
+  buyer    : User;
+  currency : Currency;
+}
+
+/** This is a stand-in for arbitrary ordered Products */
+@cds.persistence.skip:'always'
+entity Products {
+  key ID : String;
+}

orders/managed-comp.xml

@@ -12,11 +12,20 @@
   <edmx:DataServices>
     <Schema Namespace="OrdersService" xmlns="http://docs.oasis-open.org/odata/ns/edm">
       <EntityContainer Name="EntityContainer">
-        <EntitySet Name="Currencies" EntityType="OrdersService.Currencies"/>
+        <EntitySet Name="Currencies" EntityType="OrdersService.Currencies">
+          <NavigationPropertyBinding Path="texts" Target="Currencies_texts"/>
+          <NavigationPropertyBinding Path="localized" Target="Currencies_texts"/>
+        </EntitySet>
+        <EntitySet Name="Currencies_texts" EntityType="OrdersService.Currencies_texts"/>
         <EntitySet Name="Orders" EntityType="OrdersService.Orders">
+          <NavigationPropertyBinding Path="Items" Target="Orders_Items"/>
           <NavigationPropertyBinding Path="currency" Target="Currencies"/>
           <NavigationPropertyBinding Path="SiblingEntity" Target="Orders"/>
         </EntitySet>
+        <EntitySet Name="Orders_Items" EntityType="OrdersService.Orders_Items">
+          <NavigationPropertyBinding Path="up_" Target="Orders"/>
+          <NavigationPropertyBinding Path="SiblingEntity" Target="Orders_Items"/>
+        </EntitySet>
       </EntityContainer>
       <EntityType Name="Currencies">
         <Key>
@@ -29,16 +38,22 @@
         <Property Name="numcode" Type="Edm.Int32"/>
         <Property Name="exponent" Type="Edm.Int32"/>
         <Property Name="minor" Type="Edm.String"/>
-        <NavigationProperty Name="texts" Type="Collection(OrdersService.Currencies_texts)" ContainsTarget="true"/>
-        <NavigationProperty Name="localized" Type="OrdersService.Currencies_texts"/>
+        <NavigationProperty Name="texts" Type="Collection(OrdersService.Currencies_texts)">
+          <OnDelete Action="Cascade"/>
+        </NavigationProperty>
+        <NavigationProperty Name="localized" Type="OrdersService.Currencies_texts">
+          <ReferentialConstraint Property="code" ReferencedProperty="code"/>
+        </NavigationProperty>
       </EntityType>
       <EntityType Name="Currencies_texts">
         <Key>
           <PropertyRef Name="locale"/>
+          <PropertyRef Name="code"/>
         </Key>
         <Property Name="locale" Type="Edm.String" MaxLength="14" Nullable="false"/>
         <Property Name="name" Type="Edm.String" MaxLength="255"/>
         <Property Name="descr" Type="Edm.String" MaxLength="1000"/>
+        <Property Name="code" Type="Edm.String" MaxLength="3" Nullable="false"/>
       </EntityType>
       <EntityType Name="DraftAdministrativeData">
         <Key>
@@ -64,7 +79,9 @@
         <Property Name="modifiedAt" Type="Edm.DateTimeOffset" Precision="7"/>
         <Property Name="modifiedBy" Type="Edm.String" MaxLength="255"/>
         <Property Name="OrderNo" Type="Edm.String"/>
-        <NavigationProperty Name="Items" Type="Collection(OrdersService.Orders_Items)" Partner="up_" ContainsTarget="true"/>
+        <NavigationProperty Name="Items" Type="Collection(OrdersService.Orders_Items)" Partner="up_">
+          <OnDelete Action="Cascade"/>
+        </NavigationProperty>
         <Property Name="buyer" Type="Edm.String" MaxLength="255"/>
         <NavigationProperty Name="currency" Type="OrdersService.Currencies">
           <ReferentialConstraint Property="currency_code" ReferencedProperty="code"/>
@@ -78,10 +95,14 @@
       </EntityType>
       <EntityType Name="Orders_Items">
         <Key>
+          <PropertyRef Name="up__ID"/>
           <PropertyRef Name="ID"/>
           <PropertyRef Name="IsActiveEntity"/>
         </Key>
-        <NavigationProperty Name="up_" Type="OrdersService.Orders" Nullable="false" Partner="Items"/>
+        <Property Name="up__ID" Type="Edm.Guid" Nullable="false"/>
+        <NavigationProperty Name="up_" Type="OrdersService.Orders" Nullable="false" Partner="Items">
+          <ReferentialConstraint Property="up__ID" ReferencedProperty="ID"/>
+        </NavigationProperty>
         <Property Name="ID" Type="Edm.Guid" Nullable="false"/>
         <Property Name="amount" Type="Edm.Int32"/>
         <Property Name="title" Type="Edm.String"/>
@@ -140,6 +161,10 @@
       <Annotations Target="OrdersService.Currencies_texts/descr">
         <Annotation Term="Common.Label" String="{i18n>Description}"/>
       </Annotations>
+      <Annotations Target="OrdersService.Currencies_texts/code">
+        <Annotation Term="Common.Label" String="{i18n>CurrencyCode}"/>
+        <Annotation Term="Common.Text" Path="name"/>
+      </Annotations>
       <Annotations Target="OrdersService.DraftAdministrativeData">
         <Annotation Term="Common.Label" String="{i18n>Draft_DraftAdministrativeData}"/>
       </Annotations>
@@ -413,6 +438,13 @@
           </Collection>
         </Annotation>
       </Annotations>
+      <Annotations Target="OrdersService.EntityContainer/Orders_Items">
+        <Annotation Term="Common.DraftNode">
+          <Record Type="Common.DraftNodeType">
+            <PropertyValue Property="PreparationAction" String="OrdersService.draftPrepare"/>
+          </Record>
+        </Annotation>
+      </Annotations>
       <Annotations Target="OrdersService.Orders_Items/amount">
         <Annotation Term="Common.FieldControl" EnumMember="Common.FieldControlType/Mandatory"/>
       </Annotations>

orders/srv/orders-service.js

@@ -3,13 +3,13 @@ class OrdersService extends cds.ApplicationService {
 
   /** register custom handlers */
   init(){
-    const { OrderItems } = this.entities
+    const { Orders_Items:OrderItems } = this.entities
 
     this.before ('UPDATE', 'Orders', async function(req) {
       const { ID, Items } = req.data
       if (Items) for (let { product_ID, amount } of Items) {
         const { amount:before } = await cds.tx(req).run (
-          SELECT.one.from (OrderItems, oi => oi.amount) .where ({order_ID:ID, product_ID})
+          SELECT.one.from (OrderItems, oi => oi.amount) .where ({up__ID:ID, product_ID})
         )
         if (amount != before) this.orderChanged (product_ID, amount-before)
       }
@@ -18,7 +18,7 @@ class OrdersService extends cds.ApplicationService {
     this.before ('DELETE', 'Orders', async function(req) {
       const { ID } = req.data
       const Items = await cds.tx(req).run (
-        SELECT.from (OrderItems, oi => { oi.product_ID, oi.amount }) .where ({order_ID:ID})
+        SELECT.from (OrderItems, oi => { oi.product_ID, oi.amount }) .where ({up__ID:ID})
       )
       if (Items) for (let it of Items) this.orderChanged (it.product_ID, -it.amount)
     })