MongoDB-nodejs

Using MongoDB with Node.js - Jonathan Mills

https://app.pluralsight.com/course-player?courseId=c026f1ed-8078-4b78-9064-1a2626d8e8a5

Chapter 2: Getting MongoDB Running

• Setting the stage Scenario > updates for Globomantics https://www.pluralsight.com/teach/author-tools/globomantics/index Add a newspaper repository for articles

• Installing MongoDB https://www.mongodb.com/try/download/community Used all default settings during install

  Once it's installed, should be able to execute from the command line

  mongod

  If it doesn't work, likely need to add the path to environment variables Also needed to create a data folder > c:\data\db

• Created new project for VSCode created > C:\development\mongoDB-nodejs Created new project on GitHub

  git clone https://github.com/RJWerning/MongoDB-nodejs.git

  npm init npm install mongodb For the course he installs 3.4.0, I installed latest at 3.6.4

  Add new file app.js - this will be used to test connection and populate data

  // admin object allows us to do introspection on our server const admin = client.db(dbName).admin(); console.log(await admin.serverStatus()); console.log(await admin.listDatabases());

• Loading Data // A function that creates an object (ie circulationRepo) is known as Revealing Module pattern in Javascript function circulationRepo() { function loadData(data) { ... }

  return { loadData }; }

Chapter 3: Working with CRUD

• Wire up our app.js so it's more of a test harness for our repository
• Add asserts, do testing of CRUD then delete the collection so we can rerun tests
• Find is simply a cursor, doesn't actually return items.
• toArray() must be await as this is where the work is done, not at the find()
• Asserts toss errors, so run cleanup in a try/finally block

Get

• Find is simply a cursor, doesn't actually return items.
• toArray() must be await as this is where the work is done, not at the find()
• Asserts toss errors, so run cleanup in a try/finally block

Filter

• Assert on comparing objects, need to do deepStringEqual here, otherwise get an error: AssertionError [ERR_ASSERTION]: Values have same structure but are not reference-equal:

Update

• Note: findOneAndReplace returns the 'find' not the 'replace' values by default
• To return the 'replace' object you need to include params {returnOriginal: false}