Bring value from one webpage to another webpage in Ruby on Rails website without database

Bring value from one webpage to another webpage in Ruby on Rails website
without database

Summary
I'm trying to bring a value from one webpage to another webpage on my Ruby
on Rails site without saving it a second time into my MySQL database. I'm
new to Ruby, so thanks in advance for your patience.
Overview
My website users can save a map they have created. Now, I want them to be
able to edit the maps.
I have a webpage, newmaps.html.erb, that renders the map. The map has a
unique ID:
<%= newsavedmap.id %>
There's an "Edit" button under the map. When the user clicks "edit", I
want him to be taken to another webpage, maptry.html.erb , which is
essentially a form that lets the user edit the map.
Problem
I want that specific newsavedmap.id to transfer over to maptry.html.erb so
that I can load the form with newsavedmap.startingaddress,
newsavedmap.endingaddress, and all of the other data associated with that
record.
I think I'm supposed to use "POST", but I'm not sure how to do that in
this situation. This link has given me some ideas, but my form is not a
Rails form so I'm not sure how to translate it into my own solution: Pass
a custom _form text field parameter to a second page Rails
maptry.html.erb
<div id="control_panel">
<div>
<input id="startingaddress" type="text" name="starthere" size="56"></p>
</div>
<div>
<input id="endingaddress" type="text" name="endhere" size="56"></p>
</div>
<div>
<input onclick="calcRoute();" id="showmapview" value="Show Map">
</div>
</div>