Update README.md

.eslintrc

@@ -6,7 +6,7 @@
         "jest": true
     },
     "parserOptions": {
-        "ecmaVersion": 2018
+        "ecmaVersion": 2017
     },
     "globals": {
         "SELECT": true,

.npmrc

@@ -1 +1,2 @@
-@sap:registry=https://npm.sap.com
+@sap:registry=https://npm.sap.com
+package-lock=false

.vscode/launch.json

@@ -1,37 +0,0 @@
-{
-  // Use IntelliSense to learn about possible attributes.
-  // Hover to view descriptions of existing attributes.
-  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-  "version": "0.2.0",
-  "configurations": [
-    {
-      "name": "bookshop", "request": "launch", "type": "node", "runtimeExecutable": "npx", "runtimeArgs": [ "-n" ],
-      "args": [ "--", "cds", "run", "--in-memory" ],
-      "cwd": "${workspaceFolder}/packages/bookshop",
-      "console": "integratedTerminal",
-      "skipFiles": ["<node_internals>/**"]
-    },
-    {
-      "name": "cds run ...", "request": "launch", "type": "node", "runtimeExecutable": "npx", "runtimeArgs": [ "-n" ],
-      "args": [ "--", "cds", "run", "--with-mocks", "--in-memory?" ],
-      "cwd": "${workspaceFolder}/packages/${input:service}",
-      "console": "integratedTerminal",
-      "skipFiles": ["<node_internals>/**"]
-    }
-  ],
-  "inputs": [
-    {
-      "type": "pickString",
-      "id": "service",
-      "description": "Which service do you want to start?",
-      "options": [
-        "bookshop",
-        "bookstore",
-        "media-server",
-        "office-supplies",
-        "reviews-service"
-      ],
-      "default": "bookshop"
-    }
-  ]
-}

.vscode/settings.json

@@ -1,6 +0,0 @@
-{
-  "files.exclude": {
-    "**/.gitignore": true,
-    "**/.vscode": true
-  }
-}

.vscode/tasks.json

@@ -1,17 +0,0 @@
-{
-    // See https://go.microsoft.com/fwlink/?LinkId=733558
-    // for the documentation about the tasks.json format
-    "version": "2.0.0",
-    "tasks": [
-        {
-            "type": "npm", "script": "watch", "path": "packages/bookshop/",
-            "options": { "env": { "PORT": "4004" }},
-            "presentation": { "group": "A" }
-        },
-        {
-            "type": "npm", "script": "watch", "path": "packages/reviews-service/",
-            "options": { "env": { "PORT": "5005" }},
-            "presentation": { "group": "A" }
-        }
-    ]
-}

README.md

@@ -1,42 +1,3 @@
-# Welcome to SAP Cloud Application Programming model samples
+# Final state after exercise 2 for CAA265 - Rapid Service Development with SAP Cloud Application Programming Model
 
-Find here the samples for the openSAP course [Building Applications with the SAP Cloud Application Programming Model](https://open.sap.com/courses/cp7).
+**DO NOT MERGE IN MASTER**
-
-## Get Access to SAP Business Application Studio
-The recommended environment for the course is SAP Business Application Studio.  Watch [unit 2 of week 1](https://open.sap.com/courses/cp7/items/51pzQUzbXHr2kdbOmVs6jI) for how to get access.
-
-## Setup
-
-In SAP Business Application Studio, open a terminal.
-Then clone the repo with this specific branch:
-
-```sh
-git clone https://github.com/sap-samples/cloud-cap-samples projects/cloud-cap-samples -b openSAP-week1-unit4-final
-cd projects/cloud-cap-samples
-```
-
-In the `cloud-cap-samples` folder run:
-```sh
-npm install
-```
-
-## Run
-
-Now you're ready to run the samples, for example:
-```sh
-cd packages/bookshop
-cds watch
-```
-
-After that, watch out for the little popup in the lower right corner of SAP Business Application Studio that asks you to open the application in your browser.
-
-
-## Get Support
-
-Check out the cap docs at https://cap.cloud.sap. <br>
-In case you find a bug or need support, please [open an issue in here](https://github.com/SAP-samples/cloud-cap-samples/issues/new).
-
-
-## License
-
-Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under SAP Sample Code License Agreement, except as noted otherwise in the [LICENSE](/LICENSE) file.

lerna.json

@@ -1 +1,7 @@
-{"packages":["packages/*"],"version":"1.0.0"}
+{
+  "packages": [
+    "packages/*",
+    "shared/*"
+  ],
+  "version": "0.0.0"
+}

package.json

@@ -1,29 +1,16 @@
 {
   "name": "@sap/capire-samples",
   "description": "The umbrella project for all samples to easily setup for local development and tests.",
-  "repository": "https://github.com/SAP-samples/cloud-cap-samples.git",
+  "repository": "https://github.wdf.sap.corp/capire/samples.git",
   "author": "daniel.hutzel@sap.com",
   "private": true,
   "scripts": {
-    "lerna": "npx --no-install lerna -v > /dev/null || npm i lerna --no-save",
+    "install": "(npx --no-install lerna -v || npm i lerna --no-save) && lerna bootstrap --hoist --ignore tests-env --loglevel warn",
-    "install": "(npm -s run lerna) && lerna bootstrap --hoist",
+    "reset": "lerna clean -y && rm -fr node_modules",
-    "cleanup": "lerna clean -y && rm -fr node_modules",
+    "test": "jest",
-    "bookshop": "cds watch packages/bookshop",
+    "bookstore": "cds run packages/bookstore --in-memory",
-    "bookshop-enhanced": "cds watch packages/bookshop-enhanced",
+    "products-service": "cds run packages/products-service --in-memory",
-    "reviews-service": "cds watch packages/reviews-service",
+    "reviews-service": "cds run packages/reviews-service --in-memory"
-    "bookstore": "cds watch packages/bookstore",
-    "media-server": "cds watch packages/media-server"
   },
-  "dependencies": {
+  "license": "ISC"
-    "@sap/cds": "^3",
-    "express": "^4"
-  },
-  "devDependencies": {
-    "sqlite3": "*"
-  },
-  "--add-these-to-devDependencies-for-tests": {
-    "@types/jest": "*",
-    "jest": "*"
-  },
-  "license": "SAP SAMPLE CODE LICENSE"
 }

packages/bookshop/db/data/sap.capire.bookshop-Authors.csv

@@ -1,5 +0,0 @@
-ID;name
-101;Emily Brontë
-107;Charlotte Brontë
-150;Edgar Allen Poe
-170;Richard Carpenter

packages/bookshop/db/data/sap.capire.bookshop-Books.csv

@@ -1,6 +0,0 @@
-ID;title;author_ID;stock
-201;Wuthering Heights;101;12
-207;Jane Eyre;107;11
-251;The Raven;150;333
-252;Eleonora;150;555
-271;Catweazle;170;22

packages/bookshop/db/schema.cds

@@ -1,30 +0,0 @@
-namespace sap.capire.bookshop;
-using { Currency, managed } from '@sap/cds/common';
-
-entity Books : managed {
-  key ID   : Integer;
-  title    : localized String(111);
-  descr    : localized String(1111);
-  author   : Association to Authors;
-  stock    : Integer;
-  price    : Decimal(9,2);
-  currency : Currency;
-}
-
-entity Authors : managed {
-  key ID   : Integer;
-  name     : String(111);
-  books    : Association to many Books on books.author = $self;
-}
-
-entity Orders : managed {
-  key ID   : UUID;
-  OrderNo  : String @title:'Order Number'; //> readable key
-  Items    : Composition of many OrderItems on Items.parent = $self;
-}
-entity OrderItems {
-  key ID   : UUID;
-  parent   : Association to Orders;
-  book     : Association to Books;
-  amount   : Integer;
-}

packages/bookshop/package.json

@@ -1,14 +0,0 @@
-{
-  "name": "bookshop",
-  "version": "1.0.0",
-  "description": "A simple CAP project.",
-  "repository": "<Add your repository here>",
-  "license": "ISC",
-  "dependencies": {
-    "@sap/cds": "^3",
-    "express": "^4"
-  },
-  "scripts": {
-    "start": "npx cds run"
-  }
-}

packages/bookshop/sample requests.http

@@ -1,12 +0,0 @@
-### Submit Orders
-POST http://localhost:4004/browse/Orders
-Content-Type: application/json
-
-{ "OrderNo":"2019-09...", "Items":[
-    { "book_ID":201, "amount":5 }
-]}
-
-# Sending this three times should result in a 409: 5 exceeds stock for book #201
-
-### Check books entity that stock was reduced
-GET http://localhost:4004/admin/Books(201)

packages/bookshop/srv/admin-service.cds

@@ -1,6 +0,0 @@
-using { sap.capire.bookshop as my } from '../db/schema';
-service AdminService @(_requires:'admin',path:'/admin') {
-  entity Books as projection on my.Books;
-  entity Authors as projection on my.Authors;
-  entity Orders as select from my.Orders;
-}

packages/bookshop/srv/cat-service.cds

@@ -1,10 +0,0 @@
-using { sap.capire.bookshop as my } from '../db/schema';
-service CatalogService @(path:'/browse') {
-
-  @readonly entity Books as SELECT from my.Books {*,
-    author.name as author
-  } excluding { createdBy, modifiedBy };
-
-  @requires_: 'authenticated-user'
-  @insertonly entity Orders as projection on my.Orders;
-}

packages/bookshop/srv/cat-service.js

@@ -1,28 +0,0 @@
-/**
- * Implementation for CatalogService defined in ./cat-service.cds
- */
-module.exports = (srv)=>{
-
-  // Use reflection to get the csn definition of Books
-  const {Books} = cds.entities
-
-  // Add some discount for overstocked books
-  srv.after ('READ','Books', (each)=>{
-    if (each.stock > 111) each.title += ' -- 11% discount!'
-  })
-
-  // Reduce stock of books upon incoming orders
-  srv.before ('CREATE','Orders', async (req)=>{
-    const tx = cds.transaction(req), order = req.data;
-    if (order.Items) {
-      const affectedRows = await tx.run(order.Items.map(item =>
-        UPDATE(Books) .where({ID:item.book_ID})
-          .and(`stock >=`, item.amount)
-          .set(`stock -=`, item.amount)
-        )
-      )
-      if (affectedRows.some(row => !row)) req.error(409, 'Sold out, sorry')
-    }
-  })
-
-}

packages/bookstore/.cdsrc.json

@@ -0,0 +1,6 @@
+{
+    "build": {
+        "target": ".",
+        "tasks": []
+    }
+}

packages/bookstore/.gitignore

@@ -0,0 +1,15 @@
+.che/
+.gen/
+gen/
+mta_archives/
+node_modules/
+target/
+
+.cds_gen.log
+connection.properties
+*.db
+.DS_Store
+*.orig
+_out
+default-*.json
+package-lock.json

packages/bookstore/db/csv/sap.capire.bookstore-Authors.csv

@@ -0,0 +1,5 @@
+ID;name;dateOfBirth;placeOfBirth;dateOfDeath;placeOfDeath
+101;Emily Brontë;1818-07-30;Thornton, Yorkshire;1848-12-19;Haworth, Yorkshire
+107;Charlotte Brontë;1818-04-21;Thornton, Yorkshire;1855-03-31;Haworth, Yorkshire
+150;Edgar Allen Poe;1809-01-19;Boston, Massachusetts;1849-10-07;Baltimore, Maryland
+170;Richard Carpenter;1929-08-14;King’s Lynn, Norfolk;2012-02-26;Hertfordshire, England

packages/bookstore/db/csv/sap.capire.bookstore-OrderItems.csv

@@ -0,0 +1,4 @@
+ID;amount;parent_ID;book_ID;netAmount
+301;1;401;201;11.11
+302;1;401;271;15
+303;2;402;252;28

packages/bookstore/db/csv/sap.capire.bookstore-Orders.csv

@@ -0,0 +1,3 @@
+ID;modifiedAt;createdAt;createdBy;modifiedBy;OrderNo;currency_code
+401;;2019-01-31;john.doe@test.com;;1;EUR
+402;;2019-01-30;christian.georgi@sap.com;;2;EUR

packages/bookstore/db/csv/sap.capire.products-Categories.csv

@@ -0,0 +1,11 @@
+ID;parent_ID;name
+1;;Poetry
+2;;Biography
+3;;Fantasy
+4;;Science Fiction
+5;;Romance
+6;;Mystery
+7;;Thriller
+8;;Dystopia
+9;;Tragedy
+10;;Novel

packages/bookstore/db/csv/sap.capire.products-Products.csv

@@ -0,0 +1,6 @@
+ID;title;descr;author_ID;stock;price;currency_code;category_ID
+201;Wuthering Heights;"Wuthering Heights, Emily Brontë's only novel, was published in 1847 under the pseudonym ""Ellis Bell"". It was written between October 1845 and June 1846. Wuthering Heights and Anne Brontë's Agnes Grey were accepted by publisher Thomas Newby before the success of their sister Charlotte's novel Jane Eyre. After Emily's death, Charlotte edited the manuscript of Wuthering Heights and arranged for the edited version to be published as a posthumous second edition in 1850.";101;12;11.11;GBP;9
+207;Jane Eyre;"Jane Eyre /ɛər/ (originally published as Jane Eyre: An Autobiography) is a novel by English writer Charlotte Brontë, published under the pen name ""Currer Bell"", on 16 October 1847, by Smith, Elder & Co. of London. The first American edition was published the following year by Harper & Brothers of New York. Primarily a bildungsroman, Jane Eyre follows the experiences of its eponymous heroine, including her growth to adulthood and her love for Mr. Rochester, the brooding master of Thornfield Hall. The novel revolutionised prose fiction in that the focus on Jane's moral and spiritual development is told through an intimate, first-person narrative, where actions and events are coloured by a psychological intensity. The book contains elements of social criticism, with a strong sense of Christian morality at its core and is considered by many to be ahead of its time because of Jane's individualistic character and how the novel approaches the topics of class, sexuality, religion and feminism.";107;11;12.34;GBP;10
+251;The Raven;"“The Raven"" is a narrative poem by American writer Edgar Allan Poe. First published in January 1845, the poem is often noted for its musicality, stylized language, and supernatural atmosphere. It tells of a talking raven's mysterious visit to a distraught lover, tracing the man's slow fall into madness. The lover, often identified as being a student, is lamenting the loss of his love, Lenore. Sitting on a bust of Pallas, the raven seems to further distress the protagonist with its constant repetition of the word ""Nevermore"". The poem makes use of folk, mythological, religious, and classical references.";150;333;13.13;USD;1
+252;Eleonora;"""Eleonora"" is a short story by Edgar Allan Poe, first published in 1842 in Philadelphia in the literary annual The Gift. It is often regarded as somewhat autobiographical and has a relatively ""happy"" ending.";150;555;14;USD;5
+271;Catweazle;Catweazle is a British fantasy television series, starring Geoffrey Bayldon in the title role, and created by Richard Carpenter for London Weekend Television. The first series, produced and directed by Quentin Lawrence, was screened in the UK on ITV in 1970. The second series, directed by David Reid and David Lane, was shown in 1971. Each series had thirteen episodes, most but not all written by Carpenter, who also published two books based on the scripts.;170;22;15;EUR;3

packages/bookstore/db/csv/sap.capire.products-Products_texts.csv

@@ -0,0 +1,4 @@
+ID;locale;title;descr
+201;de;Sturmhöhe;Sturmhöhe (Originaltitel: Wuthering Heights) ist der einzige Roman der englischen Schriftstellerin Emily Brontë (1818–1848). Der 1847 unter dem Pseudonym Ellis Bell veröffentlichte Roman wurde vom viktorianischen Publikum weitgehend abgelehnt, heute gilt er als ein Klassiker der britischen Romanliteratur des 19. Jahrhunderts.
+207;de;Jane Eyre;Jane Eyre. Eine Autobiographie (Originaltitel: Jane Eyre. An Autobiography), erstmals erschienen im Jahr 1847 unter dem Pseudonym Currer Bell, ist der erste veröffentlichte Roman der britischen Autorin Charlotte Brontë und ein Klassiker der viktorianischen Romanliteratur des 19. Jahrhunderts. Der Roman erzählt in Form einer Ich-Erzählung die Lebensgeschichte von Jane Eyre (ausgesprochen /ˌdʒeɪn ˈɛə/), die nach einer schweren Kindheit eine Stelle als Gouvernante annimmt und sich in ihren Arbeitgeber verliebt, jedoch immer wieder um ihre Freiheit und Selbstbestimmung kämpfen muss. Als klein, dünn, blass, stets schlicht dunkel gekleidet und mit strengem Mittelscheitel beschrieben, gilt die Heldin des Romans Jane Eyre nicht zuletzt aufgrund der Kino- und Fernsehversionen der melodramatischen Romanvorlage als die bekannteste englische Gouvernante der Literaturgeschichte
+252;de;Eleonora;“Eleonora” ist eine Erzählung von Edgar Allan Poe. Sie wurde 1841 erstveröffentlicht. In ihr geht es um das Paradox der Treue in der Treulosigkeit.

packages/bookstore/db/csv/sap.common-Currencies.csv

@@ -0,0 +1,7 @@
+code;symbol;name;descr
+EUR;€;Euro;European Euro
+USD;$;US Dollar;United States Dollar
+CAD;$;Canadian Dollar;Canadian Dollar
+AUD;$;Australian Dollar;Australian Dollar
+GBP;£;Pound;Great Britian Pound
+ILS;₪;Shekel;Israeli New Shekel

packages/bookstore/db/csv/sap.common-Currencies_texts.csv

@@ -0,0 +1,13 @@
+code;locale;name;descr
+EUR;de;Euro;European Euro
+USD;de;US-Dollar;United States Dollar
+CAD;de;Kanadischer Dollar;Kanadischer Dollar
+AUD;de;Australischer Dollar;Australischer Dollar
+GBP;de;Pfund;Britische Pfund
+ILS;de;Schekel;Israelische Schekel
+EUR;fr;euro;de la Zone euro
+USD;fr;dollar;dollar des États-Unis
+CAD;fr;dollar canadien;dollar canadien
+AUD;fr;dollar australien;dollar australien
+GBP;fr;livre sterling;pound sterling
+ILS;fr;Shekel;shekel israelien

packages/bookstore/db/schema.cds

@@ -0,0 +1,35 @@
+namespace sap.capire.bookstore;
+
+// We reuse Products, which are Books in our domain
+using { sap.capire.products.Products as Books } from '@sap/capire-products';
+using { Currency, managed } from '@sap/cds/common';
+
+extend Books with {
+  author : Association to Authors;
+}
+
+entity Authors : managed {
+  key ID : Integer;
+  name   : String(111);
+  dateOfBirth  : Date;
+  dateOfDeath  : Date;
+  placeOfBirth : String;
+  placeOfDeath : String;
+  books  : Association to many Books on books.author = $self;
+}
+
+entity Orders : managed {
+  key ID : Integer;
+  OrderNo  : String @title:'Order Number'; //> readable key
+  Items    : Composition of many OrderItems on Items.parent = $self;
+  total    : Decimal(9,2) @readonly;
+  currency : Currency;
+}
+
+entity OrderItems {
+  key ID : Integer;
+  parent    : Association to Orders;
+  book      : Association to Books;
+  amount    : Integer;
+  netAmount : Decimal(9,2);
+}

packages/bookstore/package.json

@@ -0,0 +1,20 @@
+{
+    "name": "bookstore",
+    "description": "Generated by cds init",
+    "repository": "<Add your repository here>",
+    "license": "ISC",
+    "version": "1.0.0",
+    "engines": {
+        "node": "^8.9"
+    },
+    "dependencies": {
+        "@sap/capire-products": "^1.0.0",
+        "@sap/cds": "^3.17.4",
+        "express": "^4.17.1"
+    },
+    "scripts": {
+        "build": "cds build/all --clean",
+        "deploy": "cds deploy",
+        "start": "cds run"
+    }
+}

packages/bookstore/srv/services.cds

@@ -0,0 +1,17 @@
+namespace sap.capire.bookstore;
+
+using { sap.capire.products.Products, sap.capire.bookstore as my } from '../db/schema';
+
+service CatalogService {
+  @readonly entity Books as projection on Products {
+    *, category.name as category, author.name
+  } excluding { createdBy, modifiedBy };
+
+  @insertonly entity Orders as projection on my.Orders;
+}
+
+// Reuse services from @sap/capire-products...
+using { sap.capire.products.AdminService } from '@sap/capire-products';
+extend service AdminService with {
+  entity Authors as projection on my.Authors;
+}

packages/bookstore/srv/services.js

@@ -0,0 +1,18 @@
+const cds = require('@sap/cds')
+module.exports = async (srv) => {
+
+  const { Books } = srv.entities
+  // Check all amounts against stock before activating
+  srv.before(['CREATE', 'UPDATE'], 'Orders', (req) => {
+    const tx = cds.transaction(req), order = req.data
+    return Promise.all(order.Items.map(each => tx.run(
+      UPDATE(Books).where({ ID: each.book_ID })
+        .and(`stock >=`, each.amount)
+        .set(`stock -=`, each.amount)
+    ).then(affectedRows => {
+      if (!affectedRows) {
+        req.error(409, `${each.amount} exceeds stock for book #${each.book_ID}`)
+      }
+    })))
+  })
+}

packages/products-service/.gitignore

@@ -0,0 +1,12 @@
+gen/
+.gen/
+node_modules/
+target/
+*.db
+.DS_Store
+_out
+.che/
+.cds_gen.log
+package-lock.json
+*.orig
+mta_archives/

packages/products-service/db/schema.cds

@@ -0,0 +1,19 @@
+namespace sap.capire.products;
+
+using { Currency, cuid, managed, sap.common.CodeList } from '@sap/cds/common';
+
+entity Products : cuid, managed {
+  key ID   : String(36);
+  title    : localized String(111);
+  descr    : localized String(1111);
+  stock    : Integer;
+  price    : Decimal(9,2);
+  currency : Currency;
+  category : Association to Categories;
+}
+
+entity Categories : CodeList {
+  key ID   : Integer;
+  parent   : Association to Categories;
+  children : Composition of many Categories on children.parent = $self;
+}

packages/products-service/index.cds

@@ -0,0 +1,2 @@
+using from './db/schema';
+using from './srv/admin-service';

packages/products-service/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@sap/capire-products",
+  "version": "1.0.0",
+  "description": "A reuse package providing domain models and services to manage product catalogs.",
+  "repository": "https://github.wdf.sap.corp/caps/products-service.git",
+  "license": "ISC",
+  "dependencies": {
+    "@sap/cds": "^3.17.4",
+    "express": "^4.17.1"
+  },
+  "files": [
+    "db",
+    "srv",
+    "index.cds"
+  ]
+}

packages/products-service/srv/admin-service.cds

@@ -0,0 +1,7 @@
+using { sap.capire.products as db } from '../db/schema';
+namespace sap.capire.products;
+
+service AdminService @(_requires:'admin') {
+  entity Products as projection on db.Products;
+  entity Categories as projection on db.Categories;
+}

packages/products-service/tests/categories.test.js

@@ -0,0 +1,68 @@
+const cds = require ('@sap/cds')
+
+describe('reading/writing hierarchies', ()=>{
+
+    it ('should prepare to sqlite in-memory', async()=>{
+        await cds.deploy (__dirname+'/../db') .to ('sqlite::memory:')
+        expect (cds.model) .toBeDefined()
+    })
+
+    it ('should insert hierarchy of categories', ()=>{
+        const { Categories } = cds.entities
+        return INSERT.into (Categories) .entries (
+            { ID:100, name:'Some Sample Categories...', children:[
+                { ID:101, name:'Cat', children:[
+                    { ID:102, name:'Kitty', children:[
+                        { ID:103, name:'Kitty Cat', children:[
+                            { ID:104, name:'Aristocat' } ]},
+                        { ID:105, name:'Kitty Bat' } ]},
+                    { ID:106, name:'Catwoman', children:[
+                        { ID:107, name:'Catalina' } ]} ]},
+                { ID:108, name:'Catweazle' }
+            ]}
+        )
+    })
+
+    it ('should read categories with children', async()=>{
+        const { Categories } = cds.entities
+        expect (await
+
+            SELECT.one.from (Categories, c=>{
+                c.ID, c.name.as('parent'), c.children (c=>{
+                    c.name.as('child')
+                })
+            }) .where ({name:'Cat'})
+
+        ) .toMatchObject (
+
+            { ID:101, parent:'Cat', children:[
+                { child:'Kitty' },
+                { child:'Catwoman' },
+            ]}
+
+        )
+    })
+
+    it ('should read hierarchy of categories', async()=>{
+        const { Categories } = cds.entities
+        expect (await
+
+            SELECT.one.from (Categories, c=>{
+                c.ID, c.name, c.children (c=>{ c.name },{levels:3})
+            }) .where ({name:'Cat'})
+
+        ) .toMatchObject (
+
+            { ID:101, name:'Cat', children:[
+                { name:'Kitty', children:[
+                    { name:'Kitty Cat', children:[
+                        { name:'Aristocat' }, ]},
+                    { name:'Kitty Bat' }, ]},
+                { name:'Catwoman', children:[
+                    { name:'Catalina' } ]},
+            ]}
+
+        )
+    })
+
+})

packages/products-service/tests/data/sap.capire.products-Categories.csv

@@ -0,0 +1,10 @@
+ID;parent_ID;name
+0;;Some Sample Categories...
+1;;Cat
+2;1;Kitty
+3;2;Kitty Cat
+4;3;Aristocat
+5;2;Kitty Bat
+6;1;Catwoman
+7;6;Catalina
+8;;Catweazle

packages/products-service/tests/postman.json

@@ -0,0 +1,157 @@
+{
+	"info": {
+		"_postman_id": "0f8d4e79-a1c2-47fe-aeab-0319fb4ce180",
+		"name": "@sap/capire-products",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+	},
+			"item": [
+				{
+					"name": "Categories",
+					"request": {
+						"method": "POST",
+						"header": [
+							{
+								"key": "Content-Type",
+								"value": "application/json"
+							}
+						],
+						"body": {
+							"mode": "raw",
+							"raw": "{ \"ID\":0, \"name\":\"Some Sample Categories...\", \"children\":[\n    { \"ID\":1, \"name\":\"Cat\", \"children\":[\n        { \"ID\":2, \"name\":\"Kitty\", \"children\":[\n            { \"ID\":3, \"name\":\"Kitty Cat\", \"children\":[\n                { \"ID\":4, \"name\":\"Aristocat\" }\n            ]},\n            { \"ID\":5, \"name\":\"Kitty Bat\" }\n        ]},\n        { \"ID\":6, \"name\":\"Catwoman\", \"children\":[\n            { \"ID\":7, \"name\":\"Catalina\" }\n        ]}\n    ] },\n    { \"ID\":8, \"name\":\"Catweazle\" }\n]}\n"
+						},
+						"url": {
+							"raw": "http://localhost:4004/admin/cats",
+							"protocol": "http",
+							"host": [
+								"localhost"
+							],
+							"port": "4004",
+							"path": [
+								"admin",
+								"cats"
+							]
+						}
+					},
+					"response": []
+				},
+				{
+					"name": "Categories",
+					"request": {
+						"method": "GET",
+						"header": [],
+						"body": {
+							"mode": "raw",
+							"raw": ""
+						},
+						"url": {
+							"raw": "http://localhost:4004/admin/cats/0?$expand=children($expand=children($expand=children($expand=children)))",
+							"protocol": "http",
+							"host": [
+								"localhost"
+							],
+							"port": "4004",
+							"path": [
+								"admin",
+								"cats",
+								"0"
+							],
+							"query": [
+								{
+									"key": "$expand",
+									"value": "children($expand=children($expand=children($expand=children)))"
+								}
+							]
+						}
+					},
+					"response": [
+						{
+							"name": "Categories",
+							"originalRequest": {
+								"method": "GET",
+								"header": [],
+								"body": {
+									"mode": "raw",
+									"raw": ""
+								},
+								"url": {
+									"raw": "http://localhost:4004/admin/cats/0?$expand=children($expand=children($expand=children($expand=children)))",
+									"protocol": "http",
+									"host": [
+										"localhost"
+									],
+									"port": "4004",
+									"path": [
+										"admin",
+										"cats",
+										"0"
+									],
+									"query": [
+										{
+											"key": "$expand",
+											"value": "children($expand=children($expand=children($expand=children)))"
+										}
+									]
+								}
+							},
+							"status": "OK",
+							"code": 200,
+							"_postman_previewlanguage": "json",
+							"header": [
+								{
+									"key": "X-Powered-By",
+									"value": "Express"
+								},
+								{
+									"key": "OData-Version",
+									"value": "4.0"
+								},
+								{
+									"key": "content-type",
+									"value": "application/json;odata.metadata=minimal"
+								},
+								{
+									"key": "Date",
+									"value": "Tue, 21 May 2019 19:20:24 GMT"
+								},
+								{
+									"key": "Connection",
+									"value": "keep-alive"
+								},
+								{
+									"key": "Content-Length",
+									"value": "767"
+								}
+							],
+							"cookie": [],
+							"body": "{\n    \"@odata.context\": \"$metadata#cats(children(children(children(children()))))/$entity\",\n    \"@odata.metadataEtag\": \"W/\\\"+AAp4JKNOcr+OusjrdQo55RCfM+UHKpTh8EbhsxyPhM=\\\"\",\n    \"name\": \"Some Sample Categories...\",\n    \"descr\": null,\n    \"ID\": 0,\n    \"parent_ID\": null,\n    \"children\": [\n        {\n            \"name\": \"Cat\",\n            \"descr\": null,\n            \"ID\": 1,\n            \"parent_ID\": 0,\n            \"children\": [\n                {\n                    \"name\": \"Kitty\",\n                    \"descr\": null,\n                    \"ID\": 2,\n                    \"parent_ID\": 1,\n                    \"children\": [\n                        {\n                            \"name\": \"Kitty Cat\",\n                            \"descr\": null,\n                            \"ID\": 3,\n                            \"parent_ID\": 2,\n                            \"children\": [\n                                {\n                                    \"name\": \"Aristocat\",\n                                    \"descr\": null,\n                                    \"ID\": 4,\n                                    \"parent_ID\": 3\n                                }\n                            ]\n                        },\n                        {\n                            \"name\": \"Kitty Bat\",\n                            \"descr\": null,\n                            \"ID\": 5,\n                            \"parent_ID\": 2,\n                            \"children\": []\n                        }\n                    ]\n                },\n                {\n                    \"name\": \"Catwoman\",\n                    \"descr\": null,\n                    \"ID\": 6,\n                    \"parent_ID\": 1,\n                    \"children\": [\n                        {\n                            \"name\": \"Catalina\",\n                            \"descr\": null,\n                            \"ID\": 7,\n                            \"parent_ID\": 6,\n                            \"children\": []\n                        }\n                    ]\n                }\n            ]\n        },\n        {\n            \"name\": \"Catweazle\",\n            \"descr\": null,\n            \"ID\": 8,\n            \"parent_ID\": 0,\n            \"children\": []\n        }\n    ]\n}"
+						}
+					]
+				},
+				{
+					"name": "Categories",
+					"request": {
+						"method": "DELETE",
+						"header": [],
+						"body": {
+							"mode": "raw",
+							"raw": ""
+						},
+						"url": {
+							"raw": "http://localhost:4004/admin/cats/0",
+							"protocol": "http",
+							"host": [
+								"localhost"
+							],
+							"port": "4004",
+							"path": [
+								"admin",
+								"cats",
+								"0"
+							]
+						}
+					},
+					"response": []
+				}
+			]
+
+}

packages/reviews-service/.cdsrc.json

@@ -0,0 +1,6 @@
+{
+    "build": {
+        "target": ".",
+        "tasks": []
+    }
+}

packages/reviews-service/.gitignore

@@ -0,0 +1,15 @@
+.che/
+.gen/
+gen/
+mta_archives/
+node_modules/
+target/
+
+.cds_gen.log
+connection.properties
+*.db
+.DS_Store
+*.orig
+_out
+default-*.json
+package-lock.json

packages/reviews-service/.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "cds run",
+            "request": "launch",
+            "type": "node", "runtimeExecutable": "npx","runtimeArgs": [ "-n" ],
+            "args": [ "--","cds","run","--in-memory?" ], // the leading "--" arg ensures it works with as well as without debugging
+            "console": "integratedTerminal",
+            "skipFiles": [ "<node_internals>/**" ]
+        }
+    ]
+}

packages/reviews-service/db/schema.cds

@@ -0,0 +1,30 @@
+namespace sap.capire.reviews;
+using { User } from '@sap/cds/common';
+
+// Reviewed subjects can be any entity that is uniquely identified
+type ReviewedSubject : String(111);
+
+entity Reviews {
+  key ID   : String(36);
+  subject  : ReviewedSubject;
+  reviewer : User;
+  rating   : Rating;
+  title    : String(111);
+  text     : String(1111);
+  date     : DateTime;
+  likes    : Composition of many Likes on likes.review = $self;
+  liked    : Integer default 0; // counter for likes as helpful review (count of all _likes belonging to this review)
+}
+
+type Rating : Integer enum {
+  Best  = 5;
+  Good  = 4;
+  Avg   = 3;
+  Poor  = 2;
+  Worst = 1;
+}
+
+entity Likes {
+  key review : Association to Reviews;
+  key user   : User;
+}

packages/reviews-service/index.cds

@@ -0,0 +1 @@
+using from './srv/reviews-service';

packages/reviews-service/package.json

@@ -0,0 +1,19 @@
+{
+    "name": "reviews-service",
+    "version": "1.0.0",
+    "description": "Generated by cds init",
+    "repository": "<Add your repository here>",
+    "license": "ISC",
+    "dependencies": {
+        "@sap/cds": "^3.17.4",
+        "express": "^4.17.1"
+    },
+    "engines": {
+        "node": "^8.9"
+    },
+    "scripts": {
+        "build": "cds build/all --clean",
+        "deploy": "cds deploy",
+        "start": "cds run"
+    }
+}

packages/reviews-service/srv/reviews-service.cds

@@ -0,0 +1,26 @@
+namespace sap.capire.reviews;
+using { sap.capire.reviews as my } from '../db/schema';
+
+service ReviewsService {
+
+  event reviewed : { subject:String; rating: Decimal(2,1) };
+
+  // API
+  entity Reviews as projection on my.Reviews excluding { likes }
+  action like (review:Reviews.ID);
+  action unlike (review:Reviews.ID);  
+
+  // Input validation
+  annotate Reviews with {
+    subject  @mandatory;
+    title    @mandatory;
+    rating   @mandatory @assert.enum;
+  }
+
+  // Auto-fill reviewers and review dates
+  annotate Reviews with {
+    reviewer @cds.on.insert:$user;
+    date     @cds.on.insert:$now;
+    date     @cds.on.update:$now;
+  }
+}

packages/reviews-service/srv/reviews-service.js

@@ -0,0 +1,40 @@
+const cds = require('@sap/cds')
+module.exports = cds.service.impl((srv) => {
+
+  // Get the CSN definition for Reviews from the db schema for sub-sequent queries
+  // ( Note: we explicitly specify the namespace to support embedded reuse )
+  const { Reviews, Likes } = cds.entities('sap.capire.reviews')
+
+  // Increment counter for reviews considered helpful
+  srv.on ('like', (req) => {
+     if (!req.user)  return req.reject(400, 'You must be identified to like a review')
+     const {review} = req.data, {user} = req
+     const tx = cds.transaction(req)
+     return tx.run ([
+       INSERT.into (Likes) .entries ({review_ID: review, user: user.id}),
+       UPDATE (Reviews) .set({liked: {'+=': 1}}) .where({ID:review})
+     ]).catch(() => req.reject(400, 'You already liked that review'))
+  })
+
+  // Delete a former like by the same user
+  srv.on('unlike', async (req) => {
+      if (!req.user) return req.reject(400, 'You must be identified to remove a former like of yours')
+      const { review } = req.data, { user } = req
+      const tx = cds.transaction(req)
+      const affectedRows = await tx.run(DELETE.from(Likes).where({ review_ID: review, user: user.id }))
+      if (affectedRows === 1) return tx.run(UPDATE(Reviews).set({ liked: { '-=': 1 } }).where({ ID: review }))
+   })
+
+  // Emit an event to inform subscribers about new avg ratings for reviewed subjects
+  // ( Note: req.on.succeeded ensures we only do that if there's no error )
+  srv.after(['CREATE', 'UPDATE', 'DELETE'], 'Reviews', async (_, req) => {
+    const { subject } = req.data
+    const { rating } = await cds.transaction(req).run(
+      SELECT.one(['avg(rating) as rating']).from(Reviews).where({ subject })
+    )
+    req.on('succeeded', () => {
+      srv.emit('reviewed', { subject, rating })
+      console.log(`Reviewed event was emitted for book "${subject}" with rating ${rating}.`)
+    })
+  })
+})

shared/dev-env/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "dev-env",
+  "author": "daniel.hutzel@sap.com",
+  "dependencies": {
+    "@sap/cds": "^3.17.4"
+  },
+  "devDependencies": {
+    "sqlite3": "^4.0.7"
+  },
+  "license": "ISC"
+}

shared/tests-env/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "tests-env",
+  "author": "daniel.hutzel@sap.com",
+  "devDependencies": {
+    "@types/jest": "*",
+    "jest": "^24.8.0",
+    "supertest": "^4.0.2"
+  },
+  "license": "ISC"
+}