{"id":259033,"date":"2024-06-11T09:28:34","date_gmt":"2024-06-11T09:28:34","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=259033"},"modified":"2024-06-11T09:28:34","modified_gmt":"2024-06-11T09:28:34","slug":"how-to-add-default-value-in-rails-2","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-add-default-value-in-rails-2\/","title":{"rendered":"How to add default value in Rails?"},"content":{"rendered":"

How to Add Default Value in Rails?<\/p>\n

Setting default values for attributes in your Rails application is essential for providing predefined values when creating new records. In this article, we will explore various ways to add default values in Rails and discuss their implementation.<\/p>\n

**How to add default value in Rails?**<\/p>\n

To add a default value to an attribute in Rails, you can utilize either the database level defaults or the Ruby-level defaults. <\/p>\n

For example, let’s say we have a “User” model with a “role” attribute that defaults to “user”. To set a default value at the database level, you can use a migration to alter the column:<\/p>\n

“`ruby
\nclass AddDefaultRoleToUsers < ActiveRecord::Migration[6.0]
\n def change
\n change_column_default :users, :role, from: nil, to: ‘user’
\n end
\nend
\n“`<\/p>\n

This migration alters the “users” table and changes the default value for the “role” column from `nil` to `’user’`. Now, whenever a new user is created, the “role” attribute will be automatically set to “user” as its default value.<\/p>\n

Alternatively, you can define a default value at the Ruby level within the model itself:<\/p>\n

“`ruby
\nclass User < ApplicationRecord
\n attribute :role, :string, default: ‘user’
\nend
\n“`<\/p>\n

By using the `attribute` method, we set the default value of the “role” attribute to “user”. Any new instance of the User model will have “role” set to “user” by default.<\/p>\n

\n
\n

Table of Contents<\/p>\nToggle<\/span><\/path><\/svg><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n