add: notice system api

app/forms/notice/write/create_atme_form.rb

@@ -0,0 +1,23 @@
+class Notice::Write::CreateAtmeForm 
+  include ActiveModel::Model
+
+  attr_accessor :receivers_login, :atmeable_type, :atmeable_id
+
+  validate :check_receivers
+
+  def check_receivers 
+    receivers_login.each do |login|
+      receiver = User.find_by(login: login) || User.find_by_id(login)
+      raise 'receivers_login值无效.' unless receiver.present?
+    end
+  end
+
+  def check_atmeable
+    begin
+      raise 'atmeable对象无效.' unless atmeable_type.constantize.find_by_id(atmeable_id).present?
+    rescue => exception
+      raise 'atmeable对象无效.' 
+    end
+  end
+
+end