Displaying 20 results from an estimated 5000 matches similar to: "eager loading and polymorphic associations"
2008 Apr 21
2
Eager Loading Polymorphic Associations
Hi,
I''m searching for a method of eager loading polymorphic associations under
activerecord 2.0.2. After some initial google-fu I came up with a link to
an enhancement that''s been added to edge:
http://dev.rubyonrails.org/ticket/8119
Anyone have any idea how long that might take to work its way into a general
release? I''m early in development now so I can afford to
2006 Mar 31
2
Eager loading of polymorphic associations
Polymorphic associations work great until I try to do some eager
loading through :include. In my example, the interface name is
":imagehaver". Here''s my little eagerly loading find line:
Image.find(params[:id], :include => :imagehaver)
All it gives me is an ActiveRecord::EagerLoadPolymorphicError with no
further explanation. I haven''t been able to dig up anything
2008 Apr 23
2
Bug in eager loading and polymorphic associations?
Hi friends, i''m usgin the edge version because i need eager loading on
polymorphic associations support, but i see this:
Message.find(:first, :include => :owner) #This generate this query:
SQL (0.000072) SET SQL_AUTO_IS_NULL=0
Message Load (0.000389) SELECT * FROM `messages`
User Load (0.001070) SELECT * FROM `users` WHERE (users.id IN
(1,2))
And this Message.find(:first,
2006 May 24
7
migrations and SQLite
I read in the instructions of Tracks that "upgrading via the rake
migrate command is quite a bit more tricky currently with SQLite and
SQLite3". Is there any gotcha regarding migrations and SQLite3?
-- fxn
2006 Mar 26
0
Eager loading and polymorphic association
Hi all,
Is it possible to do "eager loading" with polymorphic associations ?
Ex : I have a Page model that acts as taggable. When I do
Page.find(:all), I would like to retrieve all tags associated with a
page.
Thanks,
Thomas.
--
Posted via http://www.ruby-forum.com/.
2006 Mar 19
4
elemental race conditions question
What''s the standard way to prevent race conditions in controllers?
Say user has many posts.
Post controller has action add_post that receives user id, post
controller find()s the user and while he is creating the post entry
an administrator deletes that user in a separate session. We cannot
assume the database checks foreign key integrity. How do you get that
right?
-- fxn
2006 Apr 05
5
when is model() needed?
I have just some vague and thus probably wrong ideas about when to
use model() in controllers, and by now I err on being redundant. I
don''t post them here to avoid leaving anything that may be false in
the archives.
Can anyone explain exactly in which cases one should use model()?
-- fxn
2006 Feb 19
4
is "display" a reserved name of some sort?
A view display.rhtml sees no controller state variables set in the
corresponding display action. Why?
-- fxn
2006 Feb 15
1
where to set $KCODE
My application uses only UTF-8. Which is the canonical place to do
something global like setting $KCODE?
-- fxn
2006 Feb 19
1
distributing iconv.dll
I would like to distribute Iconv for Windows with my Rails
application (developing on a Mac, no experience with dlls). I threw
iconv.dll and charset.dll under lib without luck. Where would I need
to put them (if this is possible at all)?
-- fxn
PS: The reported error message is in Spanish but translated reads
something like "the specified process was not found: Init_iconv".
2006 Feb 11
5
after_(read|find) callback?
I am pondering the possibility of encrypting/decrypting some fields
in a SQLite backend on-the-fly.
The point of the message is not security, I know that''s broken, but
whether there''s a technique that provides on-the-fly save/read
filters. Of course the solution would need to work transparently in
joins, so
user.posts.last.title
would do the right thing if title
2006 Jul 31
0
Patch for #3438: Eager loading doesn''t respect :order of associations
Hello all,
I still have a patch for #3438 (eager loading doesn''t respect
association orders); it passes all unit tests, and has additional unit
tests with full coverage. The patch is attached.
== The Bug ==
Author.find(1).posts != Author.find(1, :include => [:posts]).posts
if Author has_many :posts, :order => anything.
This means that either one must avoid eager loading or
2010 May 07
1
Can't eagerly load a polymorphic association defined in an STI parent class?
If I define an association (in my case a polymorphic one) in an STI
parent class, and try to eagerly load it in a subclass, I get the
following error:
ActiveRecord::ConfigurationError: Association name ''myassoc'' was not
found; perhaps you misspelled it?
If I redefine the same association again in the STI subclass, it
works.
Is this a bug or what?
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2011 May 03
2
Database performance for polymorphic associations under high load
Hey guys,
I''ve been thinking lately about polymorphic associations, and I
wonder: is there a noticeable or tangible performance "hit" from doing
polymorphic associations when you''ve got your database under really
high query load?
So for example, maybe I have a "message" model, a "user" model and an
"administrator" model, without any
2006 Jul 26
1
Polymorphic Associations: dynamic finders
Is there any sort of dynamic finder for polymorphic associations?
For example if I had:
class InviteNode < ActiveRecord::Base
belongs_to :inviteable, :polymorphic => true
end
I would like to be able to search by:
InviteNode.find_by_inviteable(some_object)
instead of having to do:
InviteNode.find_by_inviteable_id_and_inviteable_type(some_object.id,
some_object.class.name)
obviously I
2006 Feb 04
22
What''s the best way to embed a form?
I would like to embed my login form on my app''s home page. What''s the best way to render the login action of member controller from another action?
Thanks
Frank
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2006 Feb 10
3
[Req] polymorphic associations howto
Hi people,
I''m looking into polymorphic associations as a way to cleanup some
messy parts of my code. I think they will allow me to do exectly what
I need, but since there''s little to none written on this subject, I''d be
delighted if someone could shed some light on this. Especially what
the different options and needed table structures need to be.
Thanks,
-
2008 Apr 11
1
polymorphic associations wrong when used with inherited class?
Consider the following:
class Event
belongs_to :event_object, :polymorphic => true
end
class Asset < ActiveRecord::Base
end
class EventedAsset < Asset
has_one :event, :as => :event_object
end
EventedAsset.find(:first).event generates the following SQL:
SELECT * FROM `events` WHERE (events.event_object_id = 1 AND
events.event_object_type = ''Asset'') LIMIT 1
2007 Jan 27
1
Polymorphic Associations or not
Hey,
I am starting my store application again for the 3rd time, I am just
trying to get eveything right so that I don''t come up with any more
complex problems later. Hopefully someone can steer me in the right
direction.
I have a store that sells lots of types of product.
e.g. CDs, T-Shirts, DVD
Each product type has different associations.
Cds - multiple artists, multiple genres,
2006 Jul 10
2
Polymorphic associations in reverse?
My app has an association that''s got me scratching my head.
I have Users, and Images. A User has many Images. (Yes, another
picture sharing app, but it''s for a small niche, and it doesn''t end
in -r!)
I would like to express a "Favorite" relationship between both Users
to Users, and Users to Images. This seems like the opposite of the
standard