refactor: simplify Student initialization and move name validation to class method

lab2/student.rb

@@ -4,16 +4,12 @@ require_relative 'contact'
 class Student < Person
   attr_accessor :surname, :name, :patronymic, :birth_date
 
-  NAME_REGEX = /\A[А-Яа-яЁёA-Za-z\-]+\z/
-
-  def initialize(id:, git:, contact:, surname:, name:, patronymic:, birth_date:)
+  def initialize(id:, git:, contact:, surname: nil, name: nil, patronymic: nil, birth_date: nil)
     super(id: id, git: git, contact: contact)
-    self.surname = surname
-    self.name = name
-    self.patronymic = patronymic
-    self.birth_date = birth_date
-
-    validate_student
+    @surname = surname
+    @name = name
+    @patronymic = patronymic
+    @birth_date = birth_date
   end
 
   def self.from_string(student_string)
@@ -86,23 +82,13 @@ class Student < Person
     @birth_date = birth_date
   end
 
-  private
-
-  def validate_student
-    raise ArgumentError, 'Surname is required' if @surname.nil? || @surname.strip.empty?
-    raise ArgumentError, 'Name is required' if @name.nil? || @name.strip.empty?
-    raise ArgumentError, 'Patronymic is required' if @patronymic.nil? || @patronymic.strip.empty?
-    raise ArgumentError, 'Birth date is required' if @birth_date.nil?
-
-    raise ArgumentError, "Invalid surname format: #{@surname}" unless valid_name?(@surname)
-    raise ArgumentError, "Invalid name format: #{@name}" unless valid_name?(@name)
-    raise ArgumentError, "Invalid patronymic format: #{@patronymic}" unless valid_name?(@patronymic)
-  end
-
-  def valid_name?(name)
+  def self.valid_name?(name)
+    NAME_REGEX = /\A[А-Яа-яЁёA-Za-z\-]+\z/
     NAME_REGEX.match?(name)
   end
 
+  private
+
   def name_initial(name)
     name[0].upcase
   end