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Michael Glaesemann

2007-Oct-05 17:09 UTC

Models belonging to the session?

I''m implementing a shopping cart which is stored in the database  
rather than in the session itself. I''m using ActiveRecordStore for  
session. (using Edge)

I''d like to have the cart belong_to the session in a normal has_one/ 
belongs_to relationship, e.g.,

create table cart (cart_id primary key,
                    session_id integer not null unique
                      references sessions);

class Cart < ActiveRecord::Base
   belongs_to :session
end

class Session < ActiveRecord::Base
   has_one :cart
end

Using the How to Change Session Store page on the wiki[0] and the  
active_record_store.rb documentation[1] as references, I believe I  
should be able to define a find_cart method that returns the current  
cart or creates a new one:

# in app/controllers/application.rb
def find_cart
   @cart = @session.model.cart || @session.model.create_cart
end

I get a NoMethodError:
You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.model

However, shouldn''t there already be a session created when the page  
is called?

As using @session is deprecated, I''ve also tried using  
session.model.cart instead:

   def find_cart
     @cart = session.model.cart || session.model.create_cart
   end

However, this returns an method missing error:

undefined method `cart'' for  
#<CGI::Session::ActiveRecordStore::Session:0x33752c8>

My guess is that I''m not extending the Session model correctly:  
however, with Ruby''s open classes, I think this should work.
It''s
also interesting to me that the

What am I missing? Thanks for any suggestions or pointers to references.

Michael Glaesemann
grzm seespotcode net

[0](http://wiki.rubyonrails.com/rails/pages/HowtoChangeSessionStore)
[1](http://dev.rubyonrails.org/svn/rails/trunk/actionpack/lib/ 
action_controller/session/active_record_store.rb)

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Frederick Cheung

2007-Oct-05 17:41 UTC

head link

Re: Models belonging to the session?

On 5 Oct 2007, at 18:09, Michael Glaesemann wrote:>
> undefined method `cart'' for
> #<CGI::Session::ActiveRecordStore::Session:0x33752c8>
>
> My guess is that I''m not extending the Session model correctly:
> however, with Ruby''s open classes, I think this should work.
It''s
> also interesting to me that the
>
Perhaps the problem is that you''re extending Session rather than   
CGI::Session::ActiveRecordStore::Session ?

Fred
> What am I missing? Thanks for any suggestions or pointers to  
> references.
>
> Michael Glaesemann
> grzm seespotcode net
>
> [0](http://wiki.rubyonrails.com/rails/pages/HowtoChangeSessionStore)
> [1](http://dev.rubyonrails.org/svn/rails/trunk/actionpack/lib/
> action_controller/session/active_record_store.rb)
>
> >

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Michael Glaesemann

2007-Oct-05 17:59 UTC

head link

Re: Models belonging to the session?

On Oct 5, 2007, at 12:41 , Frederick Cheung wrote:
>
>
> On 5 Oct 2007, at 18:09, Michael Glaesemann wrote:
>>
>> undefined method `cart'' for
>> #<CGI::Session::ActiveRecordStore::Session:0x33752c8>
>>
>> My guess is that I''m not extending the Session model
correctly:
>> however, with Ruby''s open classes, I think this should work.
It''s
>> also interesting to me that the
>>
>
> Perhaps the problem is that you''re extending Session rather than
> CGI::Session::ActiveRecordStore::Session ?
That was a good idea:

class CGI::Session::ActiveRecordStore::Session
   has_one :cart
end

However, this gives me the same errors. I''ve got session.rb in app/ 
models. Might it need to be somewhere else?

Michael Glaesemann
grzm seespotcode net



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Michael Glaesemann

2007-Oct-05 19:03 UTC

head link

Re: Models belonging to the session?

On Oct 5, 2007, at 12:59 , Michael Glaesemann wrote:
> However, this gives me the same errors. I''ve got session.rb in
app/
> models. Might it need to be somewhere else?
I''ve apparently got it working by putting my session.rb file in lib/  
and requiring it from my environment.rb configuration. I guess I''m  
supposed to interpret the wiki''s
> This will of course require creating a model ‘session.rb’ which  
> extends ActiveRecord.
to mean I need to implement an alternative to  
CGI::Session::ActiveRecordStore::Session rather than just extend it.  
That''s further backed up by this section from the API docs:
> You may provide your own session class implementation, whether a  
> feature-packed Active Record or a bare-metal high-performance SQL  
> store, by setting
>
>   +CGI::Session::ActiveRecordStore.session_class = MySessionClass+
>
> You must implement these methods:
>
>   self.find_by_session_id(session_id)
>   initialize(hash_of_session_id_and_data)
>   attr_reader :session_id
>   attr_accessor :data
>   save
>   destroy
I''m otherwise happy with CGI::Session::ActiveRecordStore::Session, so  
hopefully my little extension will suit my purposes.

Thanks, Frederick, for the push!

By the way, I''d love to hear from anyone else with experience along  
these lines :)

Michael Glaesemann
grzm seespotcode net



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I. E. Smith-Heisters

2007-Oct-10 22:44 UTC

head link

Re: Models belonging to the session?

Hmn. I''ve been trying to do this same thing and found your thread on
Google.

I tried your recommendation and sort of got it working, but kept
getting errors when trying to load my added association.

So now I''m trying to put the model in app/models and have it inherit
from CGI::Session::ActiveRecordStore::Session, but when I go to set
session_class it uses the wrong Session class. Changing the name of my
custom session to avoid a namespace collision doesn''t help, and causes
an uninitialized constant error to boot. Here''s what I''ve got:

app/models/foo_session.rb
  class FooSession < CGI::Session::ActiveRecordStore::Session
    set_table_name :sessions
    belongs_to :user
  end

config/environment.rb
  CGI::Session::ActiveRecordStore.session_class = FooSession

The documentation implies it''s all so damn easy that there
doesn''t
need to be an example ;) But even with that I still get

  undefined method `user'' for #<FooSession:0xb73d5a10>

Any ideas?

On Oct 5, 12:03 pm, Michael Glaesemann
<g...-RYEyMNgfJnVLeUupdtUFmg@public.gmane.org>
wrote:> On Oct 5, 2007, at 12:59 , Michael Glaesemann wrote:
>
> > However, this gives me the same errors. I''ve got session.rb
in app/
> > models. Might it need to be somewhere else?
>
> I''ve apparently got it working by putting my session.rb file in
lib/
> and requiring it from my environment.rb configuration. I guess I''m
> supposed to interpret the wiki''s
>
> > This will of course require creating a model
''session.rb'' which
> > extends ActiveRecord.
>
> to mean I need to implement an alternative to
> CGI::Session::ActiveRecordStore::Session rather than just extend it.
> That''s further backed up by this section from the API docs:
>
> > You may provide your own session class implementation, whether a
> > feature-packed Active Record or a bare-metal high-performance SQL
> > store, by setting
>
> >   +CGI::Session::ActiveRecordStore.session_class = MySessionClass+
>
> > You must implement these methods:
>
> >   self.find_by_session_id(session_id)
> >   initialize(hash_of_session_id_and_data)
> >   attr_reader :session_id
> >   attr_accessor :data
> >   save
> >   destroy
>
> I''m otherwise happy with CGI::Session::ActiveRecordStore::Session,
so
> hopefully my little extension will suit my purposes.
>
> Thanks, Frederick, for the push!
>
> By the way, I''d love to hear from anyone else with experience
along
> these lines :)
>
> Michael Glaesemann
> grzm seespotcode net

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Pat Maddox

2007-Oct-10 22:55 UTC

head link

Re: Models belonging to the session?

On 10/5/07, Michael Glaesemann
<grzm-RYEyMNgfJnVLeUupdtUFmg@public.gmane.org>
wrote:>
> I''m implementing a shopping cart which is stored in the database
> rather than in the session itself. I''m using ActiveRecordStore for
> session. (using Edge)
>
> I''d like to have the cart belong_to the session in a normal
has_one/
> belongs_to relationship, e.g.,
>
> create table cart (cart_id primary key,
>                     session_id integer not null unique
>                       references sessions);
>
> class Cart < ActiveRecord::Base
>    belongs_to :session
> end
>
> class Session < ActiveRecord::Base
>    has_one :cart
> end
>
> Using the How to Change Session Store page on the wiki[0] and the
> active_record_store.rb documentation[1] as references, I believe I
> should be able to define a find_cart method that returns the current
> cart or creates a new one:
>
> # in app/controllers/application.rb
> def find_cart
>    @cart = @session.model.cart || @session.model.create_cart
> end
>
> I get a NoMethodError:
> You have a nil object when you didn''t expect it!
> The error occurred while evaluating nil.model
>
> However, shouldn''t there already be a session created when the
page
> is called?
>
> As using @session is deprecated, I''ve also tried using
> session.model.cart instead:
>
>    def find_cart
>      @cart = session.model.cart || session.model.create_cart
>    end
>
> However, this returns an method missing error:
>
> undefined method `cart'' for
> #<CGI::Session::ActiveRecordStore::Session:0x33752c8>
>
> My guess is that I''m not extending the Session model correctly:
> however, with Ruby''s open classes, I think this should work.
It''s
> also interesting to me that the
>
> What am I missing? Thanks for any suggestions or pointers to references.
>
> Michael Glaesemann
> grzm seespotcode net
>
> [0](http://wiki.rubyonrails.com/rails/pages/HowtoChangeSessionStore)
> [1](http://dev.rubyonrails.org/svn/rails/trunk/actionpack/lib/
> action_controller/session/active_record_store.rb)
>
> >
>
Why are you doing it like this?  Just create your cart and store the
id in the session.

def find_cart
  @shopping_cart ||= Cart.find(session[:cart_id])
end

def cart=(cart)
  if !cart.nil?
    session[:cart_id] = cart.id
  else
    session[:cart_id] = nil
  end
end

Model objects should not know anything about the session.

Pat

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Michael Glaesemann

2007-Oct-11 00:58 UTC

head link

Re: Models belonging to the session?

On Oct 10, 2007, at 17:55 , Pat Maddox wrote:
> Why are you doing it like this?  Just create your cart and store the
> id in the session.
<snip />
> Model objects should not know anything about the session.
I agree. There are two reasons why I''ve been attempting to treat the  
include the Session model in a has_one/belong_to association:

(a) Right now I don''t have any attributes associated with the Cart  
model other than its id, i.e., the table corresponding to the model  
is just

create table carts (cart_id serial primary key)

This feels wrong. There''s really no information there at all. Plus,  
ActiveRecord doesn''t know how to create new rows that consist of only  
an autogenerated primary key. It tries to INSERT INTO "carts" ()  
VALUES () which leads to an error (at least with a PostgreSQL  
backend). Perhaps there''s a way to educate ActiveRecord on how to do  
this, but I wasn''t particularly motivated to figure this out.

(b) Having the carts table reference sessions allows the you to  
cascade deletes from sessions to the carts table (and on to the  
cart_items table as well). This is handy because then you''re able to  
easily clean up stale carts when you''re cleaning out stale sessions.

However, I must say it''s been an uphill battle, including issues such  
as those raised by I.E. Smith-Heisters in another response, and  
figuring out a way to preload session data before creation of  
fixtures during testing. Learned more about the backend, but I  
haven''t been overly satisfied with the result.

I think I''m just going to go back and add a cart_created_at column to  
the carts table to work around ActiveRecord''s inability to deal with  
the situation where there''s only a single attribute. I''m too
tired
right now to consider patching ActiveRecord. Probably the simplest  
all-around solution.

I wish you had piped up a couple of days ago :) I''d love to hear your  
opinions on the two points I raised above. I''m sure I''m
missing
something.

Thanks for your response!

Michael Glaesemann
grzm seespotcode net

PS This makes me think I should move away from ActiveRecordStore  
entirely to prevent myself from considering something like this in  
the future. :)

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Michael Glaesemann

2007-Oct-11 01:07 UTC

head link

Re: Models belonging to the session?

[Please don''t top post as it makes the discussion more difficult to  
follow.]

On Oct 10, 2007, at 17:44 , I. E. Smith-Heisters wrote:
> So now I''m trying to put the model in app/models and have it
inherit
> from CGI::Session::ActiveRecordStore::Session, but when I go to set
> session_class it uses the wrong Session class. Changing the name of my
> custom session to avoid a namespace collision doesn''t help, and
causes
> an uninitialized constant error to boot.
I believe load order is the root of this problem (see below). I don''t  
think you''d have to worry about namespace issues though. I think  
you''d need to always explicitly refer to ActiveRecordStore::Session  
by it''s full name.
> The documentation implies it''s all so damn easy that there
doesn''t
> need to be an example ;)
I hear you :) During my experiments I pulled  
ActiveRecordStore::Session into it''s own file and placed it in lib/  
and ran into underlying session library errors. I thought at least  
that would work :/

I''m pretty sure one of the issues is with load order: I think the  
model needs to be in lib/ so it''s available to when the server is  
started (presumably prior to when models are loaded).
> But even with that I still get
>
>   undefined method `user'' for #<FooSession:0xb73d5a10>
>
> Any ideas?
Not really. As indicated in my response to Pat Maddox, I''m through  
with this experiment, at least for now. Perhaps when I''m a better  
coder I can revisit this and see what''s up.

If you figure it out, let me know. I''d love to hear details on how  
you got it working ;) Good luck!

Michael Glaesemann
grzm seespotcode net



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Pat Maddox

2007-Oct-11 01:26 UTC

head link

Re: Models belonging to the session?

On 10/10/07, Michael Glaesemann
<grzm-RYEyMNgfJnVLeUupdtUFmg@public.gmane.org>
wrote:>
>
> On Oct 10, 2007, at 17:55 , Pat Maddox wrote:
>
> > Why are you doing it like this?  Just create your cart and store the
> > id in the session.
>
> <snip />
>
> > Model objects should not know anything about the session.
>
> I agree. There are two reasons why I''ve been attempting to treat
the
> include the Session model in a has_one/belong_to association:
>
> (a) Right now I don''t have any attributes associated with the Cart
> model other than its id, i.e., the table corresponding to the model
> is just
>
> create table carts (cart_id serial primary key)
>
> This feels wrong. There''s really no information there at all.
Plus,
> ActiveRecord doesn''t know how to create new rows that consist of
only
> an autogenerated primary key. It tries to INSERT INTO "carts" ()
> VALUES () which leads to an error (at least with a PostgreSQL
> backend). Perhaps there''s a way to educate ActiveRecord on how to
do
> this, but I wasn''t particularly motivated to figure this out.
Just create an empty column if you want.  Call it name and default it
to blank.  Or, make it created_at, which brings us to...

> (b) Having the carts table reference sessions allows the you to
> cascade deletes from sessions to the carts table (and on to the
> cart_items table as well). This is handy because then you''re able
to
> easily clean up stale carts when you''re cleaning out stale
sessions.
In your session maintenance script, just add
Cart.destroy_all ["created_at < ?", 24.hours.ago]
> However, I must say it''s been an uphill battle, including issues
such
> as those raised by I.E. Smith-Heisters in another response, and
> figuring out a way to preload session data before creation of
> fixtures during testing. Learned more about the backend, but I
> haven''t been overly satisfied with the result.
Well yeah it''s been an uphill battle.  It should be - you''re
doing
things the wrong way.
> I think I''m just going to go back and add a cart_created_at column
to
> the carts table to work around ActiveRecord''s inability to deal
with
> the situation where there''s only a single attribute. I''m
too tired
> right now to consider patching ActiveRecord. Probably the simplest
> all-around solution.
ooh.  You almost got the right solution :)

> I wish you had piped up a couple of days ago :) I''d love to hear
your
> opinions on the two points I raised above. I''m sure I''m
missing
> something.
>
> Thanks for your response!
>
> Michael Glaesemann
> grzm seespotcode net
>
> PS This makes me think I should move away from ActiveRecordStore
> entirely to prevent myself from considering something like this in
> the future. :)
No, just don''t consider stuff like this.  ActiveRecordStore is an
implementation detail for your sessions, but your app code doesn''t
care about it.  Basically you set it up and then forget all about it.

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Michael Glaesemann

2007-Oct-11 01:52 UTC

head link

Re: Models belonging to the session?

On Oct 10, 2007, at 20:26 , Pat Maddox wrote:
> Just create an empty column if you want.  Call it name and default it
> to blank.
Again, that''s meaningless. No more meaningful than a table of integers.
> In your session maintenance script, just add
> Cart.destroy_all ["created_at < ?", 24.hours.ago]
It''d be a little more involved than that, as what you really want to  
look at is the last time the cart has been modified. I''d want to know  
the last time the cart was active: when items were last added or  
deleted. Maybe even the last time it was opened. This is all taken  
care of in the updated_at column of the sessions table. Adding the  
proper update code in either my app or the database is repeating  
myself, and prone to error.

Yes, ActiveRecord/Rails is opinionated, so I''ll just hold my tongue
now.
>> PS This makes me think I should move away from ActiveRecordStore
>> entirely to prevent myself from considering something like this in
>> the future. :)
>
> No, just don''t consider stuff like this.  ActiveRecordStore is an
> implementation detail for your sessions, but your app code doesn''t
> care about it.  Basically you set it up and then forget all about it.
This was partly motivated by what I''ve heard about the cookie-session  
store. I''ve heard it''s faster, and recently Ara Howard has
been doing
some research showing that database-backed sessions in Rails slowly  
leak memory.

Michael Glaesemann
grzm seespotcode net



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Pat Maddox

2007-Oct-11 02:00 UTC

head link

Re: Models belonging to the session?

On 10/10/07, Michael Glaesemann
<grzm-RYEyMNgfJnVLeUupdtUFmg@public.gmane.org>
wrote:>
>
> On Oct 10, 2007, at 20:26 , Pat Maddox wrote:
>
> > Just create an empty column if you want.  Call it name and default it
> > to blank.
>
> Again, that''s meaningless. No more meaningful than a table of
integers.
>
> > In your session maintenance script, just add
> > Cart.destroy_all ["created_at < ?", 24.hours.ago]
>
> It''d be a little more involved than that, as what you really want
to
> look at is the last time the cart has been modified. I''d want to
know
> the last time the cart was active: when items were last added or
> deleted. Maybe even the last time it was opened. This is all taken
> care of in the updated_at column of the sessions table.
It''s also taken care of by an updated_at column in the Cart table.
Rails automatically updates that whenever you save the cart.  If you
want whenever it was last accessed, you can do a before_filter that
updates the cart every time the page loads.
> Adding the  proper update code in either my app or the database is
repeating
> myself, and prone to error.
Hrm.  Prone to error in relation to what?  Because it''ll work a
loooooooooot better than the solutions you''ve discussed in this
thread.

> Yes, ActiveRecord/Rails is opinionated, so I''ll just hold my
tongue now.
>
> >> PS This makes me think I should move away from ActiveRecordStore
> >> entirely to prevent myself from considering something like this in
> >> the future. :)
> >
> > No, just don''t consider stuff like this.  ActiveRecordStore
is an
> > implementation detail for your sessions, but your app code
doesn''t
> > care about it.  Basically you set it up and then forget all about it.
>
> This was partly motivated by what I''ve heard about the
cookie-session
> store. I''ve heard it''s faster, and recently Ara Howard
has been doing
> some research showing that database-backed sessions in Rails slowly
> leak memory.

Bottom line, what you''re trying to do is retarded.  Anyone who has a
clue about Rails will confirm that.

Pat

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Michael Glaesemann

2007-Oct-11 03:24 UTC

head link

Re: Models belonging to the session?

On Oct 10, 2007, at 21:00 , Pat Maddox wrote:
> It''s also taken care of by an updated_at column in the Cart table.
> Rails automatically updates that whenever you save the cart.
Thanks for reminding me. I tend to think in terms of the database,  
where adding or deleting an item from the cart would only require an  
update to the cart_items table. (That would be the most efficient way  
to go about it from the database side as well: no need to hit the  
carts table.)
> Bottom line, what you''re trying to do is retarded.  Anyone who has
a
> clue about Rails will confirm that.
Wow. Retarded? Perhaps not just as experienced as others so there may  
be areas where I might be ignorant, but retarded? C''mon, Pat. You can  
do better than that.

Michael Glaesemann
grzm seespotcode net



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Pat Maddox

2007-Oct-11 06:32 UTC

head link

Re: Models belonging to the session?

On 10/10/07, Michael Glaesemann
<grzm-RYEyMNgfJnVLeUupdtUFmg@public.gmane.org>
wrote:>
>
> On Oct 10, 2007, at 21:00 , Pat Maddox wrote:
>
> > It''s also taken care of by an updated_at column in the Cart
table.
> > Rails automatically updates that whenever you save the cart.
>
> Thanks for reminding me. I tend to think in terms of the database,
> where adding or deleting an item from the cart would only require an
> update to the cart_items table. (That would be the most efficient way
> to go about it from the database side as well: no need to hit the
> carts table.)
>
> > Bottom line, what you''re trying to do is retarded.  Anyone
who has a
> > clue about Rails will confirm that.
>
> Wow. Retarded? Perhaps not just as experienced as others so there may
> be areas where I might be ignorant, but retarded? C''mon, Pat. You
can
> do better than that.
I didn''t call you retarded.  I said what you''re trying to do
is
retarded.  There''s nothing wrong with being inexperienced.  In fact,
when I started using Rails, I tried to do the exact same thing you''re
doing.  I was building a shopping cart and I wanted to connect the
cart to the session.  That''s how I know it''s so bad :)

Sorry to use the harsh language, but I showed you a simpler, far less
error-prone, and idiomatic way to do what you want, and you''re
fighting it.  I wanted to heavily discourage you from using an
atrocious solution.  This is no reflection on you personally, but
simply has to do with not being familiar with Rails and how the pieces
work together.

You''ll find that the Rails community is incredibly nice, so when bad
words come out, you''re probably doing something horribly, horribly
wrong.

Pat

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Marli Ba

2008-Oct-20 16:20 UTC

head link

Re: Models belonging to the session?

I have also been playing with this same idea, of linking sessions to the 
cart.  Has anyone had success with this?  I am also a little confused 
why this would be a horrible idea if someone could explain in a little 
more detail.
-- 
Posted via http://www.ruby-forum.com/.

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Rails - Oct 2007 - Models belonging to the session?

Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?

Re: Models belonging to the session?