Question

I have two rails Active Record models groups and accounts

group

    has_many :accounts

    id 
    name
    .. other infromation
    timestamps


Account

    belongs_to :group

    id
    name
    .. other information
    timestamps

I need to do a validates :name, :uniqueness => true in the accounts section but only under a group. As in i want the account name to be unique under a group. I know i can enforce a database unique constraint but can i do this using AR ? Is it even possible ?

Answer 1

Try this:

validates :name, uniqueness: true, scope: :group_id

For more information on the options available to validate, check out the ActiveRecord Validations documentation.