Using MongoDb

Install mongodb

• Mac
• Windows
• Linux

Guide to Install

Using MongoDB locally

1. First we want to store the database locally and in our user directory rather than a system directory, this way the folder permissions are to you the user and mongodb has read/write permissions. Without those permissions it can't create data.

   mkdir -p ~/data/db
   

2. Run mongodb using the command mongod and the flag -dbpath e.g. (windows can be a different path)

   mongod -p -dbpath ~/data/db/
   

3. View mongodb in mongodb shell, this is an interactive environment similar to irb for Ruby but using JavaScript.

   mongo shell
   

4. Select a database from mongodb we are going to use the test db

   use test
   

   this switches to the test database

5. Optional: View collections (tables) in the database 'test'

   show collections
   

Modifying the database collection

Using the previous instrucitons, you are now set to the database test and using the db object you can insert, update & delete into a collection. We will now use some of the simple methods that allow you to make changes to the collections mongodb collection methods

1. Create a collection in the test database

   db.createCollection('people')
   

   when you run 'show collections' now you will see the 'people' collection

2. insert some data into your collection 'people' NOTE: your are passing in a 'javascript' object, key value pairs into the insert() function using the {} braces

   db.people.insert({firstname: 'YOURNAME', lastname: 'YOURLASTNAME'})
   

3. Look inside your collection and find all the records created in it.

   db.people.find()
   

   This returns the ObjectId for each record, replace ObjectId in the next step

4. Find and delete record the same record in one function

   db.people.findOneAndDelete(ObjectId("5761fc4b639f77271a098f51"))
   

   This will return the removed value in the console for a validation of what was removed.