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PierreFritschPierreFritsch
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formatting
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‎bookshop/db/schema.cds‎

Lines changed: 28 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -1,36 +1,43 @@
1-
using { Currency, managed, sap } from '@sap/cds/common';
1+
using {
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Currency,
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managed,
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sap
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} from '@sap/cds/common';
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27
namespace sap.capire.bookshop;
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49
entity Books : managed {
5-
key ID : Integer;
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title : localized String(111) @mandatory;
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descr : localized String(1111);
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author : Association to Authors @mandatory;
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genre : Association to Genres;
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stock : Integer;
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price : Price;
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currency : Currency;
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image : LargeBinary @Core.MediaType: 'image/png';
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key ID : Integer;
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title : localized String(111) @mandatory;
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descr : localized String(1111);
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author : Association to Authors @mandatory;
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genre : Association to Genres;
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stock : Integer;
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price : Price;
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currency : Currency;
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image : LargeBinary @Core.MediaType: 'image/png';
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}
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1621
entity Authors : managed {
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key ID : Integer;
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name : String(111) @mandatory;
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dateOfBirth : Date;
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dateOfDeath : Date;
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placeOfBirth : String;
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placeOfDeath : String;
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books : Association to many Books on books.author = $self;
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key ID : Integer;
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name : String(111) @mandatory;
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dateOfBirth : Date;
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dateOfDeath : Date;
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placeOfBirth : String;
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placeOfDeath : String;
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books : Association to many Books
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on books.author = $self;
2430
}
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2632
/** Hierarchically organized Code List for Genres */
2733
entity Genres : sap.common.CodeList {
28-
key ID : UUID;
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parent : Association to Genres;
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children : Composition of many Genres on children.parent = $self;
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key ID : UUID;
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parent : Association to Genres;
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children : Composition of many Genres
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on children.parent = $self;
3138
}
3239

33-
type Price : Decimal(9,2);
40+
type Price : Decimal(9, 2);
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3542

3643
// ------------------------------------------------------------------

‎bookshop/srv/cat-service.cds‎

Lines changed: 28 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,35 @@
1-
using { sap.capire.bookshop as my } from '../db/schema';
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service CatalogService @(path:'/browse') {
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using {sap.capire.bookshop as my} from '../db/schema';
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service CatalogService @(path: '/browse') {
34

45
/** For displaying lists of Books */
5-
@readonly entity ListOfBooks as projection on Books
6-
excluding { descr };
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@readonly
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entity ListOfBooks as
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projection on Books
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excluding {
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descr
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};
712

813
/** For display in details pages */
9-
@readonly entity Books as projection on my.Books { *,
10-
author.name as author
11-
} excluding { createdBy, modifiedBy };
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@readonly
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entity Books as
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projection on my.Books {
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*,
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author.name as author
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}
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excluding {
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createdBy,
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modifiedBy
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};
1224

1325
@requires: 'authenticated-user'
14-
action submitOrder ( book: Books:ID, quantity: Integer ) returns { stock: Integer };
15-
event OrderedBook : { book: Books:ID; quantity: Integer; buyer: String };
26+
action submitOrder(book : Books:ID, quantity : Integer) returns {
27+
stock : Integer
28+
};
29+
30+
event OrderedBook : {
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book : Books:ID;
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quantity : Integer;
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buyer : String
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};
1635
}

‎bookshop/srv/cat-service.js‎

Lines changed: 39 additions & 38 deletions
Original file line numberDiff line numberDiff line change
@@ -1,38 +1,39 @@
1-
const cds = require('@sap/cds')
2-
3-
class CatalogService extends cds.ApplicationService { init() {
4-
5-
const { Books } = cds.entities('sap.capire.bookshop')
6-
const { ListOfBooks } = this.entities
7-
8-
// Add some discount for overstocked books
9-
this.after('each', ListOfBooks, book => {
10-
if (book.stock > 111) book.title += ` -- 11% discount!`
11-
})
12-
13-
// Reduce stock of ordered books if available stock suffices
14-
this.on('submitOrder', async req => {
15-
let { book:id, quantity } = req.data
16-
let book = await SELECT.from (Books, id, b => b.stock)
17-
18-
// Validate input data
19-
if (!book) return req.error (404, `Book #${id} doesn't exist`)
20-
if (quantity < 1) return req.error (400, `quantity has to be 1 or more`)
21-
if (quantity > book.stock) return req.error (409, `${quantity} exceeds stock for book #${id}`)
22-
23-
// Reduce stock in database and return updated stock value
24-
await UPDATE (Books, id) .with ({ stock: book.stock -= quantity })
25-
return book
26-
})
27-
28-
// Emit event when an order has been submitted
29-
this.after('submitOrder', async (_,req) => {
30-
let { book, quantity } = req.data
31-
await this.emit('OrderedBook', { book, quantity, buyer: req.user.id })
32-
})
33-
34-
// Delegate requests to the underlying generic service
35-
return super.init()
36-
}}
37-
38-
module.exports = CatalogService
1+
const cds = require("@sap/cds");
2+
3+
class CatalogService extends cds.ApplicationService {
4+
init() {
5+
const { Books } = cds.entities("sap.capire.bookshop");
6+
const { ListOfBooks } = this.entities;
7+
8+
// Add some discount for overstocked books
9+
this.after("each", ListOfBooks, (book) => {
10+
if (book.stock > 111) book.title += ` -- 11% discount!`;
11+
});
12+
13+
// Reduce stock of ordered books if available stock suffices
14+
this.on("submitOrder", async (req) => {
15+
let { book: id, quantity } = req.data;
16+
let book = await SELECT.from(Books, id, (b) => b.stock);
17+
18+
// Validate input data
19+
if (!book) return req.error(404, `Book #${id} doesn't exist`);
20+
if (quantity < 1) return req.error(400, `quantity has to be 1 or more`);
21+
if (quantity > book.stock) return req.error(409, `${quantity} exceeds stock for book #${id}`);
22+
23+
// Reduce stock in database and return updated stock value
24+
await UPDATE(Books, id).with({ stock: (book.stock -= quantity) });
25+
return book;
26+
});
27+
28+
// Emit event when an order has been submitted
29+
this.after("submitOrder", async (_, req) => {
30+
let { book, quantity } = req.data;
31+
await this.emit("OrderedBook", { book, quantity, buyer: req.user.id });
32+
});
33+
34+
// Delegate requests to the underlying generic service
35+
return super.init();
36+
}
37+
}
38+
39+
module.exports = CatalogService;

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