Displaying 20 results from an estimated 4000 matches similar to: "when (not) to use belongs_to"
2006 Aug 04
3
ForumExample
Is ForumExample ( http://wiki.rubyonrails.com/rails/pages/ForumExample/
)
the best jumping off point for building in basic commenting
functionality?
Thanks,
Greg
--
Posted via http://www.ruby-forum.com/.
2007 Feb 08
3
Get categories where forum-user posted in
I''m developing a system similar to the ForumExample (http://
wiki.rubyonrails.org/rails/pages/ForumExample), and stumbled upon the
following.
Let''s say I wanted to get all the categories a certain user posted in.
How do I get that information withouth using a custom query
through :finder_sql (and thus losing the find_in_collection ownage)?
It would also be great to see how many
2007 Nov 14
1
New Foxy Fixtures (Rails 2) & STI (Single Table Inheritance)
I''ve got some problems right now using the new model for relationships
in fixtures (by label, not by id) and STI. What I''ve got, is a couple
of models:
Attachment
--> FileDownload
Version
Version has_one file_download with file_download_id on the versions
table
In my fixtures, I have two FileDownloads in my attachments.yml like
so:
hemingway_alpha_zip:
size: 100
2006 Mar 23
4
belongs_to more than one model
Suppose I have one table:
states
id
statename
And I have two other tables that contains states:
houses
id
color
state_id
places
id
place_name
state_id
How would my model relationships look like?
class State < ActiveRecord::Base
belongs_to house
belongs_to place
end
class House < ActiveRecord::Base
has_one state
end
class Place <
2006 Mar 19
2
Multiple polymorphic belongs_to declarations
I have the following models:
class Card < ActiveRecord::Base
belongs_to :deck
belongs_to :front, :polymorphic => true
belongs_to :back, :polymorphic => true
end
class TextContent < ActiveRecord::Base
has_one :card, :as => :front
has_one :card, :as => :back
end
The conflicting has_one declarations don''t work. What I need is
2006 Jan 31
4
has_one without inverse belongs_to
I have two models called entity and user.
The entities table has a column called users_id that contains the user
id of the user that created the entity.
In entity I have...
has_one :user
... as I want to be able to show the user who created the entity from
the entity object.
But this produces the following error...
Mysql::Error: #42S22Unknown column ''users.entity_id'' in
2006 Apr 02
7
RANT: belongs_to -> refers_to
Every once in a while, I pipe up and whine that "belongs_to" should really
be ''refers_to" [http://dev.rubyonrails.org/ticket/2130]. It''s time again.
I''ve got a bunch of stuff going onto eBay, so, like any good engineer, I
don''t just post it manually: I design a Rails-based inventory database that
creates a semantically-correct XHTML/CSS auction
2006 Jan 10
2
DBDesigner4 to AR model (script)
Hi list,
I have hacked together a small script to generate an ActiveRecord model
from a DBDesigner 4 (fabForce.net) model file. Take it apart and feed it to
the pigs ;).
the article:
http://tua.ch/ruby/current.html
and the script:
http://tua.ch/ruby/dbmodel/compute_model.rb
best of whishes for the new year,
kaspar
code manufacture & ruby lab at http://www.tua.ch/ruby
2006 Apr 07
5
Confusion about has_many / belongs_to ...
I have a table called players and its model Player, and I have a table
called games and its model Game.
In the games table I have:
player1_id int(11)
player2_id int(11)
I want the tables to be associated so that I can access the player
objects using table.player1 and table.player2 rather than having to
lookup the objects based on the ids.
I am not sure how to go about this but I suspect I
2006 May 24
5
where can i find a good tutorial for has_one and belongs_to?
thanks for helps!
--
Posted via http://www.ruby-forum.com/.
2011 Sep 16
4
belongs_to not working as
Hi,
I have a model tests_user and score which are associated with each other by
has_one and belongs_to association.
class TestsUser < ActiveRecord::Base
has_one :score, :foreign_key => :reg_no
end
class TestsUser < ActiveRecord::Base
belongs_to :tests_user, :foreign_key => :reg_no
end
where reg_no is a unique field in both the table!
score = Score.find(:first) gives me
2005 Dec 14
5
belongs_to and multiple foreign keys
Hi all,
I''m confused about how I''m supposed to specify a belongs_to relationship when
the table includes multiple columns that reference the same parent table.
In my case I have a "schedules" table with "opened_by" and "closed_by" columns,
that both reference the "users" table. In theory, they can be two different
user ids.
table
2008 Apr 29
4
Default values for belongs_to and has_one
There really doesn''t seem to be a *declarative* way to define a default
value for belongs_to and has_one associations
class Person < ActiveRecord::Base
belongs_to :address
end
p = Person.new
p.address.city = ''Atlantis'' # Bummer!
Of course, there''s an easy way to avoid this
class Person < ActiveRecord::Base
belongs_to :address
2010 Aug 10
4
(Dreaded) STI, belongs_to
Having problems with STI. Names below have been changed to protect the
innocent. Imagine a system that allows someone to apply for one of two
different types of school scholarships. Each scholarship goes through a
different review process, represented by a state machine (this is not a
state machine question). So there are two state machine classes that
differ slightly and subclass a generic
2006 Mar 22
2
Radio Button Defailt Value?
I have:
<%= radio_button ''foo'', ''bar_id'', ''1'' %>
<%= radio_button ''foo'', ''bar_id'', ''2'' %>
<%= radio_button ''foo'', ''bar_id'', ''3'' %>
I would like to have option #3 be selected if foo.bar_id is nil. Is
there a way to do
2010 May 11
1
has_one/belongs_to -- accessing the subordinate
With a has_one/belongs_to relationship, what''s the best way to guarantee
that the belongs_to object gets created and is accessible alongside the
has_one object? I *think* the after_create callback is a good choice,
but I discovered an oddity while trying it.
F''rinstance, if every horse has a carriage:
============
ActiveRecord::Schema.define do
create_table(:horses) {|t|
2006 Feb 20
1
belongs_to, has_one, has_many question (again?)
Hi All,
Probably this has been asked numerous times, I apologize already!
Can somebody point me to a good tutorial on how Rails works with
relations?
I know about database design and normalization, I also know about
programming in general (and OOP for that matter).
Only thing I can say is that I''m following the "Four days on Rails"
tutorial by John McCreesh.
He writes
2006 Jul 23
8
belongs_to :through ?
Suppose I have a belongs_to relationship and the thing it belongs to,
belongs in turn to something else.
For example, I would like to do:
belongs_to :city
belongs_to: :county, :through => :city
While it is not too much trouble to do obj.city.county, there are times
when I need to iterate through the attributes and include this
second-order attribute. Special code to handle this messes up
2007 Oct 08
7
belongs_to association doesn't work with _id set
Hello there,
I''m developing an application which has models like this:
class Vehicle < ActiveRecord::Base
belongs_to :internal_dim, :class_name => "Dimension"
def before_create()
idim = Dimension.create
self.internal_dim_id = idim.id
#self.create_internal_dim # Doesn''t work
end
end
class Dimension < ActiveRecord::Base
2006 Apr 03
2
Problems with STI in has_many/belongs_to in Rails 1.1
I have a problem that surfaced in my attempt to upgrade my application
to Rails 1.1.
We have a STI model on the "belongs_to" side of a has_many/belongs_to
relationship. All my unit tests for this model pass, and the
relationships all seem to work fine.
But in my functional tests, I''m getting errors. I''ve traced it back
into the call to the has_many