delete migrations rails code example
Example 1: how to reset migrations rails
To rollback all migrations the best solution is:
rake db:migrate VERSION=0
This will rollback any migrations without losing data. Then, run all migrations again with
rake db:migrate
Example 2: rails migration remove column
rails g migration Remove..From.. col1:type col2:type col3:type
#Exemple :
rails g migration RemoveCountryFromSampleApps country:string