ruby/rails/debugger variable dump question

[Ralph Shnelvar]

newb here.

(OT: Merry Christmas, all.)

So I placed a debugger statement into my ROR app and run
ruby script/server webrick --debugger

My app hit the debugger statement.

I then did a
var local

----------------------------------------------------------
(rdb:68) var local
_ =>
exception => No route matches "/xxx" with {:method=>:get}
handler => #<Method: #<ApplicationController:0x6018a3c @action_name="index", @_response=#<ActionController::Response:0x6018b40 @session={"flash"=>{}}, @redirected_to=nil,

[snipped a ton of stuff]

"HTTP_ACCEPT"=>"text/html,application/xhtml+xml,
application/xml;q=0.9,*/*;q=0.8", "REQUEST_METHOD"=>"GET", "HTTP_CONNECTION"=>"keep-alive"}, @request_method=:get, @parameters={}>, @parameters={}>>.__bind_1261677328_946000>
(rdb:68)
----------------------------------------------------------


I have no idea how to interpret this or format this for pretty output.

So ... by guess and by gosh (and because I read it somewhere) I then ran irb inside the debugger and did



----------------------------------------------------------
(rdb:68) @_response
#<ActionController::Response:0x6018b40 @session={"flash"=>{}}, @redirected_to=nil, @writer=#<Proc:0x0612469c@f:/Ralph-Rails-Apps/authlogic/vendor/rails/actionpack/lib/action_controller/response.rb:46>, @request=#<ActionController::Request:0x6018b68

[snipped a ton of stuff]

@assigns={}, @helpers=#<ActionView::Base:roxyModule:0x6018960>>, @body=["",
nil, [], []], @assigns=[], @header={"Cache-Control"=>"no-cache"}, @status=200>
----------------------------------------------------------



Since that was no better, I tried (because I saw it somewhere)
y @_response
inside irb

I don't even see y documented as a debugger command.

----------------------------------------------------------

irb(#<ApplicationController:0x6018a3c>):002:0> y @_response
--- &id007 !ruby/object:ActionController::Response
assigns: &id001 []

block:
body:
- ""
-
- *id001
- []

header: &id005 !map:Rack::Utils::HeaderHash
Cache-Control: no-cache
redirected_to:
request: &id003 !ruby/object:ActionController::Request
content_type:
env:
rack.session.record: !ruby/object:ActiveRecord::SessionStore::Session
attributes:
updated_at: 2009-12-24 06:54:00
session_id: fab30d62f08ae89e5b87d68bb1647c3c
id: "1"
created_at: 2009-12-24 06:54:00
data: |
BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo
SGFzaHsABjoKQHVzZWR7AA==

attributes_cache: {}

data:
flash: &id002 !map:ActionController::Flash::FlashHash {}

action_controller.rescue.request: *id003
SERVER_NAME: localhost
rack.request.cookie_hash:
_session_id: fab30d62f08ae89e5b87d68bb1647c3c

[snipped a ton of stuff]

request: *id003
helpers: !ruby/object:ActionView::Base:roxyModule
receiver: *id008
view_paths: !seq:ActionView:athSet
- !ruby/object:ActionView::ReloadableTemplate::ReloadablePath
disk_cache: {}

path: f:/Ralph-Rails-Apps/authlogic/app/views
paths: {}

writer: !ruby/objectroc {}

=> nil
irb(#<ApplicationController:0x6018a3c>):003:0>

----------------------------------------------------------




That's a bit better but still mostly uninterpretable to me.

So ... how would I get programmatic access to, say, SERVER_NAME or the _session_id?

Is there documentation on how to use the debugger?