db/migrate/20181113100336_add_null_true_to_timestamps.rb
class AddNullTrueToTimestamps < ActiveRecord::Migration[4.2]
def change
change_column :notes, :created_at, :datetime, null: true
change_column :notes, :updated_at, :datetime, null: true
change_column :sessions, :created_at, :datetime, null: true
change_column :sessions, :updated_at, :datetime, null: true
change_column :users, :created_at, :datetime, null: true
change_column :users, :updated_at, :datetime, null: true
end
end