Create multiple records on model

form:

<%= form_for @instruction_user, :url => new_fb_instruction_users_path do |f| %>
          <% @users.each do |user| %>
          <%= user.name %>
                <%= fields_for "instruction[]" do %>
                <%= f.text_field :remark_tl%>

          <% end %>
          <%= check_box_tag("instruction_users_ids[]", user.id ) %>

controller:

def new_fb  
    @errors =  []
    @instruction_users = []
    params[:instruction_users_ids].each do |u|
      instruction_user = InstructionUser.new(:user_id => u)
      if instruction_user.valid?
        instruction_user.save
      else
        @errors += instruction_user.errors
      end
    end

I cant find a way to get the value of :remark_tl in..
checking google since hours..
Some help would be really nice..thanks

<%= form_for @instruction_user,

                <%= f.text_field :remark_tl%>

Have you tried:

   params[:instruction_user][:remark_tl]?