Rails - Mar 2008 - has_many relationship not providing my model with attribute=

I have a Rails app that tracks service requests (SRs).  A user can
observe many service requests, and a service request can be observed
by many users, hence it''s a many-to-many relationship.  I have a table
for this defined as follows:

    create_table :sr_user_roles do |t|
        t.column :user_id, :integer
        t.column :sr_id, :integer
        t.column :role_type_id, :integer
    end

Note that the particular relationship of the user to the service
request can vary, and I need to keep track of that in the many-to-many
table.  Therefore, I don''t think HABTM will suit my needs.  Therefore
I use has_many in both the User and Sr models:

class Sr < ActiveRecord::Base
    has_many :sr_user_roles, :foreign_key => :sr_id
    has_many :observers, :through => :sr_user_roles, :source => :user
    [...]
end

class User < ActiveRecord::Base
    has_many :sr_user_roles, :foreign_key => :user_id
    has_many :observed_srs, :through => :sr_user_roles, :source => :sr
    [...]
end

The code for the many-to-many model is below:

class SrUserRole < ActiveRecord::Base
    belongs_to :sr
    belongs_to :user
    [...]
end

In my code, I can print out anSr.observers in a debug statement.
However, when I try to assign to anSr.observers, I get the following
error:

    NoMethodError in SrsController#update
    undefined method `observers='' for #<Sr:0x2000af8>

Obviously I''m dealing with an Sr object from the above error, yet it
doesn''t seem to know about observers=.  Here''s the code that
causes
the above error:

    logger.info "@sr.observers = #{@sr.observers}"   # This works
    # The assignment below does not work
    @sr.observers = params[''sr_user_role''].values.collect {|v|
User.find(v) if not v.empty?}

I''m using Rails 1.2.6.  Any idea what might be going wrong here?

steven

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Following up on my previous post on has_many issues, I have upgraded
to rails 2.0.2 in an attempt to solve my has_many problems.  The
current issue is that the collection_singular_ids syntax as documented
at
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#M001103
does not seem to work for me.  I have code that looks like this:

class Sr < ActiveRecord::Base
    has_many :observers, :through => :sr_user_roles, :source => :user

In the controller, if I understand correctly, I should be able to do
this:

            @sr.observer_ids = <array of values>

Yet I get the error:

    undefined method `observer_ids='' for #<Sr:0x26a0354>

Interestingly, Rails seems to have defined observer=, even though it
doesn''t seem to change the contents of the database when I assign
something using the observer= mechanism.

I''ve been working on this problem for quite a while and just
can''t
figure it out.  Is this a bug?  Has anyone actually made this work for
them?

steven

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

On 1 Apr 2008, at 06:25, Steven D. Arnold wrote:
>
> Following up on my previous post on has_many issues, I have upgraded
> to rails 2.0.2 in an attempt to solve my has_many problems.  The
> current issue is that the collection_singular_ids syntax as documented
> at
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#M001103
> does not seem to work for me.  I have code that looks like this:
>
It doesn''t work for has_many :through. If you look right at the top of
the link you gave there''s a handle table of which association methods  
you get when.

Fred
> class Sr < ActiveRecord::Base
>    has_many :observers, :through => :sr_user_roles, :source => :user
>
> In the controller, if I understand correctly, I should be able to do
> this:
>
>            @sr.observer_ids = <array of values>
>
> Yet I get the error:
>
>    undefined method `observer_ids='' for #<Sr:0x26a0354>
>
> Interestingly, Rails seems to have defined observer=, even though it
> doesn''t seem to change the contents of the database when I assign
> something using the observer= mechanism.
>
> I''ve been working on this problem for quite a while and just
can''t
> figure it out.  Is this a bug?  Has anyone actually made this work for
> them?
>
> steven
>
> >

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---