Ruby/rails/debugger variable dump question

Rails
1

newbie here.

(OT: Happy New Year, all.)

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 how to 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::ProxyModule:0x6018960>,
@body=["",
nil, [], []], @assigns=[], @header={“Cache-Control”=>“no-cache”},
@status=200>

Since that was no better for me to understand, 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::ProxyModule
receiver: *id008
view_paths: !seq:ActionView::PathSet
- !ruby/object:ActionView::ReloadableTemplate::ReloadablePath
disk_cache: {}

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

writer: !ruby/object:Proc {}

=> 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 other than “help” or
page 216 in the Pickaxe book?

2

On Dec 27, 10:59 pm, Ralph S. [email protected] wrote:

newbie here.

(OT: Happy New Year, all.)

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

My app hit the debugger statement.

[snip]

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

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

It’s not - it’s a method that is part of the ruby standard library: it
dumps the argument passed to it as yaml. It’s mostly normal that this
doesn’t make any sense to you - it’s exposing a lot of internal state
from the response object. A good place to start would be to look at
the api for the Response object and try the things you see there.

[snip]

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?

The debugger will run ruby code for you, so do exactly what you would
do if you were writing code in that part of your app (eg if you’re in
a controller you could look at request.host or request.env

Is there documentation on how to use the debugger other than “help” or
page 216 in the Pickaxe book?

just FYI, ruby-debug is not the same as the debugger described in the
pickaxe

Fred

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