class ContactGroup < ActiveRecord::Base
    has_and_belongs_to_many :contacts, :class_name => "Contact", :join_table => "contact_contact_groups", :association_foreign_key => "contact_id", :foreign_key => "contact_group_id"

    validate :check_group_name
    validate :check_group_id, :on => :create
    validate :check_group_uniqness, :on => :update

    def ContactGroup.find_by_user(user_id)
        find_by_sql("select * from contact_groups where customer_id = #{user_id} order by name asc")
    end

    protected

    def check_group_name
        errors.add('name', t(:contactgroup_name_invalid)) unless self.name =~ /^.{1,50}$/i
    end

    def check_group_id
        if ContactGroup.find_first(["name = '#{name}' and customer_id = #{user_id}"])
            errors.add("name", _('Please enter group name (1 to 50 characters)'))
        end
    end

    def check_group_uniqness
        if ContactGroup.find_first(["name = '#{name}' and customer_id = #{user_id} and id <> #{id}"])
            errors.add("name", _('You already have contact group with this name'))
        end
    end

end