[RUBY] [Rails] How to change the column name of the table

How to change the column name of the table

I summarized how to change the column name of the table in Rails. The steps are as follows.

① Create migration file ② Edit migration file ③ Reflected in the database

This time, change the column name as follows.

Change before wheather

After change weather

Model name Column name (before change) Column name (after change)
users wheather weather

① Create migration file

First, create a migration file to change the column name.

$ rails generate migration rename_ [column name before change] _column_to_ [model name (plural)]

This time $rails generate migration rename_wheather_column_to_users Describe as.

② Edit migration file

A new file will be created in / db / migrate, so add the change method and describe the column name you want to change there.

File created this time: 20201115004326_rename_wheather_column_to_users.rb

Describe as follows.


class RenameWheatherColumnToUsers < ActiveRecord::Migration[6.0]
  def change
    rename_column :Model name, :Column name (before change), :Column name (after change)

In this case, it is described as follows.


class RenameWheatherColumnToUsers < ActiveRecord::Migration[6.0]
  def change
    rename_column :users, :wheather, :weather

③ Reflected in the database

Finally, it is reflected in the database and the column name change is completed. $rails db:migrate

that's all. I just mistakenly wrote weather as weather, and this kind of work happened (laughs). Please be careful not to misspell it ☆

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