Am I handling this Rails Form Correctly?
class RelationshipsController < ApplicationController

  def new
    @user_id = User.find_by_id(params[:user_id])
    @relationship = Relationship.new
  end

  def create
    @relationship = Relationship.new(params[:relationship])
    @relationship.rel_id = User.find_by_id(params[:user_id])
    @relationship.user_id = current_user
    if @relationship.save
        redirect_to root_url, :notice => "Signed Up!"
    else
        render "new"
    end
  end
end

<section id="main">
  <%= form_for [@user_id, @relationship]  do |f| %>
    <div class="field">
      <%= f.label :type %>
      <%= select_tag(:type, options_for_select([['Friend', 0], ['Family', 1],['Spouse', 2]])) %>
    </div>
   <div class="actions"><%= f.submit %></div>
  <% end %>
</section>

@relationship.rel_id = params[:user_id]

@relationship = Relationship.new(params[:relationship])
@relationship[:type] = params[:type]