CODEWITHSUNDEEP
ruby-on-rails
Salah Saleh
Salah Saleh

Reputation: 811

Adding migration options to previously created tables in rails

I created a migration in rails using this command:

rails generate model Group name:string

and I ran rake db:migrate. Now I want to add some properties to the 'name' like uniqueness and a default value. What are my options to achieve that? do I have to create a new migration for that?

Also let's say I will generate a new model called 'Department' which also has a unique and a default value, is there a way to add these options to the command directly?

Upvotes: 0

Views: 44

Answers (1)

Justin
Justin

Reputation: 4940

Good question. It sort of depends on a few things, like if you are collaborating with others on this project or it's just you.

If it's just you, and you don't mind losing all the Groups you have created, then you can rake db:rollback and modify your migration file. Note, rake db:rollback will only roll back 1 migration. To rollback x number of migrations, then rake db:rollback STEP=x will work for you.

If you are collaborating with others (or if this app is in production), I would recommend just creating another migration file.

rails g migration update_groups_name

def up
  change_column :groups, :name, :string, default: 'foo'
  add_index :groups, :name, unique: true
end

def down
  change_column_default :groups, :name, nil
  remove_index :groups, :name
end

Upvotes: 2

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