Ruby on rails cheat sheet

# check ruby version && rbenv
rbenv local

# Check last available version of Ruby
rbenv install --list

# Create app
rails _5.1.4_ new appname --database=postgresql

# Add pg gem to Gemfile

# Add a new role for this app
su - postgres

# Then create a new user - role for PG
create role myapp with createdb login password 'password1';

# Install gems
bundle install

# Setup DB
rake db:setup

# Migration
rake db:migrate
# Rails 5.0 and above
rails db:migrate

# Go back
rails db:rollback

# Load seed data
rake db:seed

# Look for TODO, FIXME or OPTIMIZE in project
rails notes

# List of available tasks
rails -T

# Show existing routes
rake routes

# Scaffolding
rails generate scaffold name attribute:type
rails g scaffols name attr:type

# New controller
rails g controller ControllerName actionname

# New model
rails g model

# Destroy model or whatever was made using `generate`
rails destroy
rails destroy model ModelName

# Start server port 3000 by default
rails server
rails s
# localhost:3000

# Console
rails c
rails console
# Specify an environment:
rails c staging
# Do it without changing any data
rails c --sandbox

# DB Console: postgres, MySQL, SQLite
rails dbconsole



# ERB
# <%= %> <%= @product.price %>
# <% %> <% if user.admin? %><% end %>