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This validates that the attribute's value is unique right before the object gets saved.

class Account < ApplicationRecord
  validates :email, uniqueness: true
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There is a :scope option that you can use to specify one or more attributes that are used to limit the uniqueness check:

class Holiday < ApplicationRecord
  validates :name, uniqueness: { scope: :year,
    message: "should happen once per year" }
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There is also a :case_sensitive option that we can use to define whether the uniqueness constraint will be case sensitive or not.
This option defaults to true.

class Person < ApplicationRecord
  validates :name, uniqueness: { case_sensitive: false }
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