how to migrate db and change column names code example

Example 1: active record modify column name

rename_column :table, :old_column, :new_column

Example 2: rename column in db rails

class RenameTitleToNameInTasks < ActiveRecord::Migration[6.0]
  def up
    rename_column :tasks, :title, :name
  end

  def down
    rename_column :tasks, :name, :title
  end
end