Problems with attachments

Hello everybody

I have some problems with an attachments.

I have the next model

class Profile < ActiveRecord::Base

  belongs_to :user

  before_create :set_default_icon

  has_attached_file :icon, {     :url => "/ system/:class/:attachment/:id/:style_:basename.:extension",     :styles => {       :big => Tog::Plugins.settings(:tog_social, "profile.image.versions.big"),       :medium => Tog::Plugins.settings(:tog_social, "profile.image.versions.medium"),       :small => Tog::Plugins.settings(:tog_social, "profile.image.versions.small"),       :tiny => Tog::Plugins.settings(:tog_social, "profile.image.versions.tiny")     }}.merge(Tog::Plugins.storage_options)

  has_attached_file :pdf, {     :url => "/ system/:class/:attachment/:id/:style_:basename.:extension",     :path => "/ system/:rails_root/:public/:profile/:pdfs/:id/:style/:basename.:extension"   }.merge(Tog::Plugins.storage_options)

  validates_attachment_content_type :pdf, :content_type => [ 'application/pdf', 'application/msword',

'application/vnd.openxmlformats- officedocument.wordprocessingml.document' ],                                     :message => 'Asegurese que el fichero tiene la extensión .pdf o .doc'

end

When i put validates_attachment_content_type :pdf ¿is obligatory that i have to upload a file?

because if I only upload a photo then when i submit on my form fails because i don't update a pdf.

Can anyone help me?

thanks.