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# In Gemfile

# Include AWS SDK V1 for paperclip if your paperclip version is less than 5.0
gem 'aws-sdk-v1'

# Need to AWS V2 SDK for SNS methods, gem 'aws-sdk', '~>1.6' doesn't have Aws::SNS methods
gem 'aws-sdk', '~> 2.0'

######################################################

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# Prepare the schema for the additional session records.
# XXXXXXXXXXXXXXXX_create_user_session.rb
class CreateUserSessions < ActiveRecord::Migration
  def change
    create_table :user_sessions do |t|
      t.references :user, :foreign_key => true, :index => true, :null => false
      t.text :user_agent
      t.datetime :expire_at # use expire_at to control the expiration after issuing JWT

      t.timestamps null: false

raviwu

git init

git add . add current directory to stage

git add -A add all untrack directories and files to stage

git commit commit staged files

git checkout -b new-branch-name create new branch and checkout to new branch

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Basic tools

See Usage of specific command: man

man command checks out the manual for the command, for instance use man echo to see the description of the echo command.

Commen quit from mass or manufal windows

Use q to quit the manual mode, normally q works for the similar mode entered by other command like ri Array.

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Shortcut of iTerms2

windows and tabs

• command + T to open new tab
• shift + command + [ / ] to switch between tabs
• command + W to close the tab
• command + D to have vertical divided windows
• command + [ / ] to switch between windows