fixed version

README.md

@@ -1,3 +1,3 @@
-# Final state after exercise 2 for CAA265 - Rapid Service Development with SAP Cloud Application Programming Model
+# Final state of exercise 1 for CAA265 - Rapid Service Development with SAP Cloud Application Programming Model
 
 **DO NOT MERGE IN MASTER**

packages/.cdsrc.json

@@ -0,0 +1,3 @@
+{
+  "cds_version": "^3.17.4"
+}

packages/reviews-service/.cdsrc.json

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

packages/reviews-service/.gitignore

@@ -1,15 +0,0 @@
-.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

@@ -1,16 +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": "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

@@ -1,30 +0,0 @@
-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

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

packages/reviews-service/package.json

@@ -1,19 +0,0 @@
-{
-    "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

@@ -1,26 +0,0 @@
-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

@@ -1,40 +0,0 @@
-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}.`)
-    })
-  })
-})