thr3ads.net - Rails - Selecting ''attribute id'' not ''object id'' [Nov 2006]

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Taylor Strait

2006-Nov-14 21:31 UTC

Selecting ''attribute id'' not ''object id''

When a user logs in I want to grab the room he lives in by its id but I 
can''t seem to get only the room id!
> session[:current_room_id]      = Person.find(session[:person_id]).rooms.id
returns this for ''session'':
>--- !ruby/object:CGI::Session 
>data: &id001 
>  :person_id: 1
>  :person_name: Test User
>  :current_room_id: 57306370 <--ARRAY OBJECT ID
>  :person_role: user
>  flash: !map:ActionController::Flash::FlashHash {}
But I don''t want to the object id of the room array, I want the
specific
Room.id so I can call it back with the session when I need it.  Taking 
out''.id'' returns an object array:
> session[:current_room_id]      = Person.find(session[:person_id]).rooms.id
returns this for ''session'':
>--- !ruby/object:CGI::Session 
>data: &id001 
>  :current_room_id: 
>  - !ruby/object:Room 
>    attributes: 
>      id: 1 <--THIS IS WHAT I WANT
>      <SNIP>
>      width: "25"
>  :person_id: 1
>  :person_name: Test User
>  :current_room: 57306370
>  :person_role: user
Though I''m thrilled that I was able to pull off the 
''Person.find(session[:person_id]).rooms'' join on my first try,
I''m sure
I am missing some small detail to grab the room id.  Any ideas?

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Taylor Strait

2006-Nov-14 21:31 UTC

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Re: Selecting ''attribute id'' not ''object id''

The second code snippet should be:
> session[:current_room_id]      = Person.find(session[:person_id]).rooms

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dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org

2006-Nov-14 21:35 UTC

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Re: Selecting ''attribute id'' not ''object id''

HI --

On Tue, 14 Nov 2006, Taylor Strait wrote:
>
> When a user logs in I want to grab the room he lives in by its id but I
> can''t seem to get only the room id!
>
>> session[:current_room_id]      =
Person.find(session[:person_id]).rooms.id
>
> returns this for ''session'':
>
>> --- !ruby/object:CGI::Session
>> data: &id001
>>  :person_id: 1
>>  :person_name: Test User
>>  :current_room_id: 57306370 <--ARRAY OBJECT ID
>>  :person_role: user
>>  flash: !map:ActionController::Flash::FlashHash {}
>
> But I don''t want to the object id of the room array, I want the
specific
> Room.id so I can call it back with the session when I need it.  Taking
> out''.id'' returns an object array:
>
>> session[:current_room_id]      =
Person.find(session[:person_id]).rooms.id
>
> returns this for ''session'':
>
>> --- !ruby/object:CGI::Session
>> data: &id001
>>  :current_room_id:
>>  - !ruby/object:Room
>>    attributes:
>>      id: 1 <--THIS IS WHAT I WANT
>>      <SNIP>
>>      width: "25"
>>  :person_id: 1
>>  :person_name: Test User
>>  :current_room: 57306370
>>  :person_role: user
>
> Though I''m thrilled that I was able to pull off the
> ''Person.find(session[:person_id]).rooms'' join on my first
try, I''m sure
> I am missing some small detail to grab the room id.  Any ideas?
If the person only has one room:

   class Person < ActiveRecord::Base
     has_one :room

and

   class Room < ActiveRecord::Base
     belongs_to :person

then you should be able to do:

   session[:current_room_id] = Person.find(session[:person_id]).room.id

If the person has multiple rooms, then you have to decide some way to
decide which one you want to save the id of, out of the array of all
of them.


David

-- 
                   David A. Black |
dblack-0o/XNnkTkwhBDgjK7y7TUQ@public.gmane.org
Author of "Ruby for Rails"   [1] | Ruby/Rails training &
consultancy [3]
DABlog (DAB''s Weblog)        [2] | Co-director, Ruby Central, Inc.  
[4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org

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Taylor Strait

2006-Nov-14 22:06 UTC

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Re: Selecting ''attribute id'' not ''object id''

Thanks David, this solved the issue:
> Person.find(session[:person_id]).rooms.each {|room|
session[:current_room_id] = room.id}

However, I''m using a third table ''rentals'' to join
people and rooms
therefore have had to use "has_many" because "has_one" does
NOT support
'':through =>''.  So in reality a person cannot have more
than one room
but, since I am keeping historical data, but in the table a person will 
have multiple rooms.  Any join will only return one result though 
because I have set this in the models:
>   has_many    :people, :through => :rentals, :conditions =>
"ended_at IS NULL"
>   has_many    :rooms, :through => :rentals, :conditions =>
"ended_at IS NULL"
So even though there will only be one room in the 
Person.find(session[:person_id]).rooms array do I still have to use an 
iterator?  Is there not a prettier way to do this?


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Taylor Strait

2006-Nov-14 22:15 UTC

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Re: Selecting ''attribute id'' not ''object id''

The issue seems to be the model-join table ''rentals.'' for
people -
rooms.  With my textbook has_many <-> belongs_to relationships:

Buildings have many units
Units have many rooms

ActiveRecord pulls the ids easily:
> Person.find(session[:person_id]).rooms.each {|room|
session[:current_room_id] = room.id}
> session[:current_unit_id]       =
Room.find(session[:current_room_id]).unit.id
> session[:current_building_id]   =
Unit.find(session[:current_unit]).building.id
Maybe using a model table for joins just has to be that messy in order 
to get the added functionality?

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Al Evans

2006-Nov-14 22:35 UTC

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Re: Selecting ''attribute id'' not ''object id''

Taylor Strait wrote:
> So even though there will only be one room in the 
> Person.find(session[:person_id]).rooms array do I still have to use an 
> iterator?  Is there not a prettier way to do this?
If you know there is only one room,

Person.find(session[:person_id]).rooms[0].id

should work.

--Al Evans

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Taylor Strait

2006-Nov-14 23:31 UTC

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Re: Selecting ''attribute id'' not ''object id''

> If you know there is only one room,
> 
> Person.find(session[:person_id]).rooms[0].id
> --Al Evans

That worked like a charm.  I just didn''t know how to reference the
array
properly.  Thanks!  Isn''t this better:
> session[:current_room_id]       =
Person.find(session[:person_id]).rooms[0].id
> session[:current_unit_id]       =
Room.find(session[:current_room_id]).unit.id
> session[:current_building_id]   =
Unit.find(session[:current_unit]).building.id
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Rails - Nov 2006 - Selecting 'attribute id' not 'object id'

Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''

Re: Selecting ''attribute id'' not ''object id''