mac install ruby

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brew install rbenv ruby-build
# Add rbenv to bash so that it loads every time you open a terminal
echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bash_profile
source ~/.bash_profile
# Install Ruby
rbenv install 2.4.1
rbenv global 2.4.1
ruby -v
# you should install the Command Line tools as they aren't installed by default (xcode)
xcode-select --install
gem install rails -v 5.1.3
rbenv rehash
rails -v
# create new application
rails new blog
# if webpacker is not installed
brew install yarn
rails webpacker:install
# run server
rails server

server

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# start default web server: puma
rails server

drop & clear table

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rails console
ActiveRecord::Migration.drop_table(:users)
# where users is the table name. And done, worked for me!
##clear table
rails db:purge

destroy model

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rails destroy model student
# where student is the model

generate model

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rails generate model student \
uin:integer first_name:string middle_name:string last_name:string \
level: integer \
email:string \
phone: string \
assigned: boolean \
advisor_email: string \
can_ta: boolean \
can_grader: boolean \
can_sgrader: boolean \
perferences: string \
date_enrolled: date \
last_modified: timestamp

rbenv usage

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# list all installed ruby
rbenv versions
# list all available versions
rbenv install -l
#install ruby
rbenv install 2.0.0-p247
#use local
rbenv local 2.0.0-p247
rbenv rehash

heroku

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heroku run rake db:migrate --app morning-reef-98714