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

I hope this help

class ModifyColumnTables 
  def change
    remove_column :posts, :old_column
    add_column :posts, :new_column, :type_of_column
  end
end