hosamshahin

# Rails Migration
http://guides.rubyonrails.org/migrations.html

## Migrations methods:
* add_column
* add_index
* change_column
* change_table
* create_table
* drop_table

hosamshahin

# Amazon linux
$ sudo yum install hstr


# Ubuntu
sudo apt-get install software-properties-common

sudo apt-add-repository -y ppa:ultradvorka/ppa
sudo apt-get update
sudo apt-get install -y hh

hosamshahin

#!/bin/bash
#
# Copyright 2011, Tim Branyen @tbranyen <tim@tabdeveloper.com>
# Dual licensed under the MIT and GPL licenses.
#
# Automatically clone single or multiple repos into a folder,
# great for setting up a git projects folder.
#
# Install: curl https://gist.github.com/raw/902154/github.sh > /usr/local/bin/gh
#          chmod +x /usr/local/bin/gh

hosamshahin

App 2091 output: Error during failsafe response: undefined local variable or method `env' for #<ExceptionHandler::ExceptionController:0x000055a292149300>
App 2091 output: Did you mean?  end
App 2091 output:                END
App 2091 output:   /home/ubuntu/OpenDSA-LTI/app/controllers/exception_handler/exception_controller.rb:30:in `status'
App 2091 output:   /home/ubuntu/OpenDSA-LTI/vendor/bundle/ruby/2.7.0/gems/activesupport-6.0.3.1/lib/active_support/callbacks.rb:428:in `block in make_lambda'
App 2091 output:   /home/ubuntu/OpenDSA-LTI/vendor/bundle/ruby/2.7.0/gems/activesupport-6.0.3.1/lib/active_support/callbacks.rb:200:in `block (2 levels) in halting'
App 2091 output:   /home/ubuntu/OpenDSA-LTI/vendor/bundle/ruby/2.7.0/gems/actionpack-6.0.3.1/lib/abstract_controller/callbacks.rb:34:in `block (2 levels) in <module:Callbacks>'
App 2091 output:   /home/ubuntu/OpenDSA-LTI/vendor/bundle/ruby/2.7.0/gems/activesupport-6.0.3.1/lib/active_support/callbacks.rb:201:in `block in halting'
App 2091 output:   /home/ub

hosamshahin

- simple tutorial 
https://hackhands.com/ruby-rails-tutorial-creating-rails-instance-existing-mysql-db/

- StackoverFlow discussion
http://stackoverflow.com/questions/4119659/rails-3how-to-generate-models-for-existing-database-tables

- Translate legacy db to ActiveRecord models
https://github.com/wnameless/rare_map

- helpful bolg post

hosamshahin

sudo su - postgres
createdb database_name
psql -s database_name
create user database_name password 'database_name';
GRANT ALL PRIVILEGES ON DATABASE database_name TO database_name;

dropdb database_name

# stop postgress process and release port 5432 on Mac
brew services stop postgresql

hosamshahin

#!/bin/bash
#####################################################
# Name: Bash CheatSheet for Mac OSX
#
# A little overlook of the Bash basics
#
# Usage:
#
# Author: J. Le Coupanec
# Date: 2014/11/04

hosamshahin

# to connect to the server without password

- Open a terminal on your machine A as user a and generate a pair of authentication keys. Do not enter a passphrase:

a@A:~> ssh-keygen -t rsa

Generating public/private rsa key pair.
Enter file in which to save the key (/home/a/.ssh/id_rsa):
Created directory '/home/a/.ssh'.
Enter passphrase (empty for no passphrase):

hosamshahin

{
	"auto_complete_commit_on_tab": true,
	"auto_complete_delay": 1,
	"bold_folder_labels": true,
	"color_scheme": "Packages/User/SublimeLinter/Monokai (SL).tmTheme",
	"default_line_ending": "unix",
	"ensure_newline_at_eof_on_save": false,
	"fallback_encoding": "UTF-8",
	"font_size": 12,
	"highlight_modified_tabs": true,

hosamshahin

# remove the virtualbox
sudo apt-get autoremove 'virtualbox*'
# download and install 5.1
http://download.virtualbox.org/virtualbox/5.1.14/virtualbox-5.1_5.1.14-112924~Ubuntu~xenial_amd64.deb
# download and install VirtualBox 5.1.14 Oracle VM VirtualBox Extension Pack
http://download.virtualbox.org/virtualbox/5.1.14/Oracle_VM_VirtualBox_Extension_Pack-5.1.14-112924.vbox-extpack