El 08/08/12 15:48, Quiliro Ordóñez escribió:
El 08/08/12 14:25, Matt Jones escribió:
On Aug 8, 2012, at 2:11 PM, Quiliro Ordóñez wrote:
I have constructed the following models:
class Work < ActiveRecord::Base
hobo_model # Don't put anything above this
fields do
name :string
url :string
timestamps
end
belongs_to :user
has_many :works, :through => :work_assignments, :accessible => true
has_many :work_assignments, :dependent => :destroy
children :works
class WorkAssignment < ActiveRecord::Base
hobo_model # Don't put anything above this
fields do
timestamps
end
belongs_to :work
Apologies for not replying sooner - I could have *sworn* that I had
replied to an earlier post on this issue, but apparently there's a
problem between my keyboard and chair. :)
Anyways, the issue is that you've only got a single foreign key field
on WorkAssignment, which is confusing the associations. It's actually
somewhat surprising that it doesn't give an error in this situation.
You really want associations like this (skipping accessible options
for now):
on Work:
has_many :work_assignments, :dependent => :destroy
has_many :related_works, :through => :work_assignments
on WorkAssignment:
belongs_to :work
belongs_to :related_work, :class_name => 'Work'
If you'd like to traverse the links in the other direction, you can
also add (to Work):
has_many :reverse_work_assignments, :dependent => :destroy,
:class_name => 'WorkAssignment', :foreign_key => 'related_work_id'
has_many :reverse_related_works, :through =>
:reverse_work_assignments, :source => :work
An example will help here:
A is related to B and C
D is related to B and C and E
B's reverse_related_works are A and D
E's reverse_related_works are just D
Thanks Matt. I tried your suggestion. These are the final models:
class Work < ActiveRecord::Base
hobo_model # Don't put anything above this
fields do
name :string
url :string
timestamps
end
belongs_to :user
has_many :work_assignments, :dependent => :destroy
has_many :related_works, :through => :work_assignments #,
:accessible => true
# children :works
class WorkAssignment < ActiveRecord::Base
hobo_model # Don't put anything above this
fields do
timestamps
end
belongs_to :work
belongs_to :related_work, :class_name => 'Work'
class User < ActiveRecord::Base
hobo_user_model # Don't put anything above this
fields do
name :string, :required, :unique
email_address :email_address, :login => true
administrator :boolean, :default => false
timestamps
end
has_many :works
But there is the problem that I can no longer see the interface to add
works. I used to have it before making the above changes. Is it that I
am missing creating the related_work model?
I have removed the # before :accessible => true on the work model and it
worked!
If your relations are truly symmetrical, things are a bit trickier;
the standard way I've handled things like that in the past is to
denormalize the data just a little and build *two* WorkAssignment
records (one in each direction). This complicates updating links a
bit, but greatly simplifies retrieving things that are related.
How is this done?
Would you please explain it?
--
Saludos libres,
Quiliro Ordóñez
Presidente
Asociación de Software Libre del Ecuador - ASLE
Av de la Prensa N58-219 y Cristóbal Vaca de Castro
Quito, Ecuador
(593)2-253 5534
(593)2-340 1517
(593)8-454 8078
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