How to rename a column and change its type by migration same time

Question

In my general_exams table, I have a column named semester, type is string. Now I want to change its name to semester_id, type

Answer 1

This works as of Rails 4

def change
  rename_column :general_exams, :semester, :semester_id
  change_column :general_exams, :semester_id, :integer
end