Why do I get an undefined method error in Ruby on Rails app?

Thanks for any help you can offer. I'm trying to figure out why I'm getting the undefined method error described below. I'm new to Ruby on Rails, but I thought that by creating the @waypoint, I could call methods for it (like @waypoint.waypointaddress). My models use a belongs_to and has many (Newsavedmaps can have many waypoints.) I appreciate your feedback on what I'm doing wrong.

Error Refers to if [email protected]?

    NoMethodError (undefined method `waypointaddress' for #<Array:NUMBERSHERE>):
    app/controllers/maptry_controller.rb:33:in `index'

maptry controller

    @newsavedmap = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]})
    @waypoint = Waypoint.find(:all, :conditions => {:newsavedmap_id => params[:newsavedmap_id]})
    @newsavedmap.id = params[:newsavedmap_id]
    @newsavedmap.name = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]}).name
    @newsavedmap.optimize = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]}).optimize

    if [email protected]_masterlocation_id.nil?       
    @start_i_name = Masterlocation.find(:first, :conditions => {:id => @newsavedmap.start_masterlocation_id}).i_name
    end
    if [email protected]?  
    @waypoint_i_name = Masterlocation.find(:first, :conditions => {:id => @waypoint.waypoint_masterlocation_id}).i_name
    end
    if [email protected]_masterlocation_id.nil?     
    @end_i_name = Masterlocation.find(:first, :conditions => {:id => @newsavedmap.end_masterlocation_id}).i_name
    end

    else
        @newsavedmap = Newsavedmap.new  
    end

EDIT 1

Here is my updated controller using code from Mu's comment. However, I'm getting an error of "undefined method `each'" for the maptry.html.erb view included below.

To clarify, there may be one or more waypoints that match the conditions. I'd like to return all of them and then do a for each in my maptry view.

Also, the .where(...) threw an undefined method error for where, so I used find. Maybe that's related to the problem? I'm in Rails 2.X.

Code from maptry.html.erb

    <% if params[:newsavedmap_id] %>
            <% for waypoint in @waypoint %>
          <option selected value="<%= @waypoint.waypointaddress %>"><%= @waypoint_inst_name %></option>
            <% end %>
          <% end %>

updated maptry controller

    if params[:newsavedmap_id]
    @newsavedmap = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]})
    @waypoint = Waypoint.find(:first, :conditions => {:newsavedmap_id => params[:newsavedmap_id]})
    @waypoint.waypointaddress = Waypoint.find(:first, :conditions => {:newsavedmap_id => params[:newsavedmap_id]}).waypointaddress
    @waypoint.waypoint_masterlocation_id = Waypoint.find(:first, :conditions => {:newsavedmap_id => params[:newsavedmap_id]}).waypoint_masterlocation_id
    @waypoint_inst_name = Masterlocation.find(:first, :conditions => {:id => @waypoint.waypoint_masterlocation_id}).inst_name
    @newsavedmap.id = params[:newsavedmap_id]
    @newsavedmap.name = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]}).name
    @newsavedmap.optimize = Newsavedmap.find(:first, :conditions => {:id => params[:newsavedmap_id]}).optimize

    if [email protected]_masterlocation_id.nil?       
    @start_inst_name = Masterlocation.find(:first, :conditions => {:id => @newsavedmap.start_masterlocation_id}).inst_name
    end
    if [email protected]_masterlocation_id.nil?     
    @end_inst_name = Masterlocation.find(:first, :conditions => {:id => @newsavedmap.end_masterlocation_id}).inst_name
    end

    else
    @newsavedmap = Newsavedmap.new  
    end