Ошибки при использовании select_tag

  <p>
    <%= f.label :faculty %><br />
    <%if not @faculty == nil %>
    <%= select_tag :faculty,options_for_select (@faculty.map {|p| [p.faculty,p.dean]})%><span style="color:red">*</span><br />    
  </p>

  <p>
     <%= f.label :faculty %><br />
     <%if not @faculty == nil %>
     <%= f.select ("faculty","faculty",@faculty.map{|p| [p.faculty,p.faculty]})%><span style="color:red">*</span><br />
   </p>

<p>
    <%= f.label :faculty %><br />
    <%if not @faculty == nil %>
    <%= select_tag 'faculty',options_from_collection_for_select(@faculty,:faculty,:faculty) %><span style="color:red">*</span><br />
  </p>

  <p>
    <%= f.label :faculty %><br />
    <%if not @faculty == nil %>
    <%= f.select ('faculty',options_from_collection_for_select(@faculty,:faculty,:faculty))%><span style="color:red">*</span><br />
  </p>

    @user = User.find(:first, :conditions => ["username = ? and password = ?", cookies[:username],@old_password.password])
        if(@new_password.password == @new_password_confirm.password) && (@new_password_confirm.password != '')
            @user.password = @new_password_confirm.password
            @user.save
            flash[:okey] = "Password was successfully changed!"
        end