rails update column migration code example

Example 1: change column rails example

def change
    change_column(:table_name, :column_name, :new_type)
end

Example 2: rails migration update column default value

class MigrationName < ActiveRecord::Migration
	def change
    	change_column :my_table, :my_column, :data_type, deafult: "value"
	end
end