conditional_callbacks

⚙️ Use Conditional Callbacks with if/unless

Make callbacks run only under specific conditions by using the if and unless options. This avoids unnecessary method calls and keeps callbacks focused.

class Invoice < ApplicationRecord
  before_save :apply_discount, if: :eligible_for_discount?

  private

  def eligible_for_discount?
    total_amount > 1000
  end

  def apply_discount
    self.total_amount *= 0.9
  end
end

Here, apply_discount runs only when eligible_for_discount? returns true, preventing unwanted modifications.