Added customer composite key

app/models/customer.rb

@@ -1,7 +1,40 @@
 class Customer < ApplicationRecord
+  # Use Rails 7.1's native composite primary key
+  self.primary_key = %i[first_name surname original_phone]
+
   belongs_to :company
 
-  validates :name, presence: true, uniqueness: { scope: :company_id }
+  validates :first_name, presence: true
+  validates :surname, presence: true
   validates :phone, presence: true
+  validates :original_phone, presence: true
   validates :company_id, presence: true
+
+  validates :first_name, uniqueness: {
+    scope: %i[surname original_phone company_id],
+    message: -> { I18n.t('customers.customer.already_exists') }
+  }
+
+  validates :birthyear, numericality: {
+    only_integer: true,
+    greater_than: 1900,
+    less_than_or_equal_to: -> { Time.current.year }
+  }, allow_nil: true
+
+  before_validation :set_original_phone, on: :create
+
+  def full_name
+    [first_name, surname].compact_blank.join(' ')
+  end
+
+  # Add method for URL generation
+  def to_param
+    [first_name, surname, original_phone].join('_')
+  end
+
+  private
+
+  def set_original_phone
+    self.original_phone = phone if original_phone.blank?
+  end
 end