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mongo-hands-on's Introduction

Mongo Hands On

Start on docker

docker run --name mongo -d mongo
docker exec -it mongo bash

Start mongo cli

Note: run this command inside mongo container.

mongosh

Commands

Create collection

db.createCollection('COLLECTION_NAME')

Insert an item into a collection

db.COLLECTION_NAME.insert({ 'any_key': 'any_value' })

Get all items from a collection

db.COLLECTION_NAME.find()

Or

db.COLLECTION_NAME.find().pretty()

Remove item from a collection

db.COLLECTION_NAME.remove({
  '_id': ObjectId('ITEM_ID')
})

Get items from a collection by attributes

db.COLLECTION_NAME.find({
  any_key: 'any_value'
})

Or

db.COLLECTION_NAME.find({
  'any_key_1.any_key_2': 'any_value'
})

Or

db.COLLECTION_NAME.find({
  $or: [
    { 'any_key_1.any_key_2': 'any_value_1' },
    { 'any_key_1.any_key_2': 'any_value_2' }
  ]
})

Or

db.COLLECTION_NAME.find({
  'any_key_1.any_key_2': {
    $in: ['any_value_1', 'any_key_2']
  }
})

Or

db.COLLECTION_NAME.find({
  'any_key_1.any_key_2': {
    $gt: 'any_value_1'
  }
})

Get one item from a collection by attributes

db.COLLECTION_NAME.findOne({
  any_key: 'any_value'
})

Get items from a collection by attributes and sort

db.COLLECTION_NAME.find({
  any_key: 'any_value'
}).sort({ any_key: 1 }) # 1 for asc and -1 for desc

Get items by attributes from a collection and limit

db.COLLECTION_NAME.find({
  any_key: 'any_value'
}).limit(ANY_LIMIT)

Update an item in a collection

db.COLLECTION_NAME.update(
  { any_key: 'any_value' }, # query
  { ... } # item data
)

Or

db.COLLECTION_NAME.update(
  { any_key: 'any_value' }, # query
  {
    $set: {
      ... # item data
    }
  } 
)

Or

db.COLLECTION_NAME.update(
  { any_key: 'any_value' }, # query
  {
    $set: {
      ... # item data
    }
  },
  {
    multi: true
  } 
)

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