graphql

graphql/.env

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+PORT = 4007

graphql/db/data/sap.capire.graphql-Chapters.csv

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+book_ID;number;title
+201;1;Chapter 1
+201;2;Chapter 2
+201;3;Chapter 3

graphql/db/schema.cds

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+using {managed} from '@sap/cds/common';
+using {sap.capire.bookshop} from '@capire/bookshop';
+
+namespace sap.capire.graphql;
+
+extend bookshop.Books with {
+  chapters : Composition of many Chapters
+               on chapters.book = $self;
+}
+
+entity Chapters : managed {
+  key book   : Association to bookshop.Books;
+  key number : Integer;
+      title  : String;
+}

graphql/examples.http

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+GET http://localhost:4007/graphql?query={AdminService{Books{title,chapters{number,title}}}}

graphql/examples.md

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+1. open `http://localhost:4007/graphql`
+2. paste into left field:
+    ```graphql
+    {
+      AdminService {
+        Books {
+          title
+          chapters {
+            number
+            title
+          }
+        }
+      }
+    }
+    ```
+3. press play button

graphql/package.json

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+{
+  "name": "@capire/graphql",
+  "version": "1.0.0",
+  "dependencies": {
+    "@capire/bookshop": "*",
+    "@graphql-tools/schema": "^8.3.1",
+    "@sap/cds": "^5.6",
+    "express-graphql": "^0.12.0",
+    "graphql": "^16.0.1"
+  },
+  "cds": {
+    "features": {
+      "graphql": true
+    }
+  }
+}

graphql/srv/admin-service.cds

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+using {sap.capire.graphql} from '../db/schema';
+
+extend service AdminService with {
+  entity Chapters as projection on graphql.Chapters;
+}