Rails - Jul 2006 - Subject: Trying to Get Results from Form Element

I am trying to create an application loosely based on the Depot application
presented in Agile Web Development with Rails (AWDwR).  I am using the folowing
controllers:

admin_Controller
application_Controller
city_map_controller (with method: displayGMap)


==  Code Extract from city_map_controller =# Show a Google Map on a new page
def displayGMap
# @mapPoint = Gmap.find(params[:id])

# DBUG: Go back with report of what we found
redirect_to_index("What the form got:  |#{params[:id]}|
|#{params[:mapPoint]}|")

  if params[:context] == :embedded
    render(:layout => false, 
    :locals => { :mapPoint => @mapPoint})
    end
  end

I am using the following model:

gmap.rb (containing class Gmap < ActiveRecord::Base)

with the following views:

city_map (containing displayGMap.rhtml, index.rhtml)
layouts (containing city_map.rhtml)

Everything starts well.  I display a page (city_map/index.rhtml) with a form to
select
a map point.  When I get to the "action" method (displayGMap) I find
that I don''t
have access to the results of my selection.  In fact, I''m not certain
what I have.
I tried to use statements like the ones in AWDwR book to extract params values,
but only get nil.  Now I''m confused.  How can I see what is passed into
the action method?
How can I understand what the Action Controller is trying to tell me?


== Messages from Rails Action Controller =ActiveRecord::RecordNotFound in
CitymapController#displayGMap
Couldn''t find Gmap without an ID

Request
Parameters: {"commit"=>"Show Map",
"mapPoint"=>{"id"=>"5"}}


==Code Extract from index.rhtml=<%= start_form_tag( :action =>
"displayGMap" ) %>
<% mapPoints = Gmap.allMapPoints() -%>
<%= cityList = mapPoints.map { |m| [m.description, m.id] }
select("mapPoint", "id", cityList) %>
<%= submit_tag( "Show Map" ) %>

By the Way - 
When I hard code the parameter value i.e. @mapPoint = Gmap.find(5),
everything works fine.

let try: mapPoint[:id]


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