You can do it in 2 ways, if you do it from the database you will have to change it manually and then update it with
rails db:schema:dump .
To update your
schema , however, you will have to modify the models and controllers. If on the other hand you like to do it with a migration, you will first need to generate it with:
rails generate migration cambiando_columna
... and in the migration that I generate you put the following (it is wrong in
rename_colum , it is
class CambiandoColumna< ActiveRecord::Migration[5.0]
rename_column :pagos, :ntrantes, :Entrantes
... and when you finish modifying this migration simply put the command
rails db:migrate for this change to take effect.