Moving net-ldap query into model
treebase = "OU=Organisation,DC=foo,DC=com"
    filter = Net::LDAP::Filter.eq( "cn", "#{CGI.escape(params[:collect])}" )
    attrs = ["givenname", "cn", "mail"]
    host = "somehost"
    port = "389"
    base = "OU=Organisation,DC=foo,DC=com"
    username = "CN=Foo"
password = "bar"

    @collection = Net::LDAP.open( :host => host, :port => port, :base => base, :auth => {:method => :simple, :username => username , :password => password} ) do |ldap|ldap.search( :base => treebase, :attributes => attrs, :filter => filter)
    end

<%= form_tag new_ticket_path(@ticket), :method => 'get' do %>
  <p>
    <%= text_field_tag :collect, params[:collect] %>
    <%= submit_tag "Weiter", :name => nil %>
  </p>
<% end %>

@collection = Ticket.ldap(params[:collect])

<%= f.text_field :supervisor, :value => @collection.first.mail.first  %>

wrong number of arguments (1 for 0)