Rails how to switch between dev and production mode?

If you are using Rails 4.2 then you must know rails uses “spring” to make it faster. So in that case you can use following commands:

For Development just run

Rails 4.2
    bin\rails s
Otherwise
   rails s

For Production just run

Rails 4.2
    bin\rails s -e production
Otherwise    
    rails s -e production

To setup production database
if database in production does not exist then run

Rails 4.2
    bin/rake db:create db:migrate RAILS_ENV=production
Otherwise
    rake db:create db:migrate RAILS_ENV=production
    bundle exec rake db:create db:migrate RAILS_ENV=production

If DB already exists the:

Rails 4.2
  bin/rake db:migrate RAILS_ENV=production
Otherwise
  rake db:migrate RAILS_ENV=production
  OR
  bundle exec rake db:migrate RAILS_ENV=production

Also if you want to stop spring or start spring then use following commands:

 bin/spring stop
 bin/spring start