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Step 1: Create the Model and Database Migration

To create a new model and database migration file, run the following command: 
bin/rails g spree:model Spree::Brand name:string:index
This will create a couple of files:
  • app/models/spree/brand.rb - the model file
  • db/migrate/XXXXXXXXXXXXXX_create_spree_brands.rb - the database migration file
Now run the migration: 
bin/rails db:migrate
This will create the table spree_brands with the column name in the database. The name column is indexed for faster lookups. Also the model file app/models/spree/brand.rb is created.

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Step 2: Extend the Model file

Now that the model file is created, let’s add some additional functionality to it, starting with validations:
app/models/spree/brand.rb
module Spree
  class Brand < Spree::Base
    # Validations
    validates :name, presence: true
  end
end
This is a standard Ruby on Rails ActiveRecord model. Let’s break down each part:
  • Inherits from Spree::Base to automatically inherit all Spree functionality. Also the model itself is namespaced under Spree:: module, so it’s available as Spree::Brand in the application.
  • validates :name, presence: true - using ActiveRecord validations to ensure that the name is present.