Rails - Jul 2006 - Get a collection through ActiveRecord for using with option_groups_from_collection_for_select

Hello,

I am having some difficulties with ActiveRecord.

What I want to do is to get a collection of SubjectGroups for using
with option_groups_from_collection_for_select


My Code:

=======================================class Subject < ActiveRecord::Base
  has_and_belongs_to_many :users
  belongs_to :subject_group
end

class SubjectGroup < ActiveRecord::Base
  has_many :subjects
end

@subjects= Subject.find(:all, :include => :subject_group)
@groups= SubjectGroup.find(:all, :include => :subjects)

The first find instruction runs just fine, the second gives me the
following error:

You have a nil object when you didn''t expect it!, The error occurred
while evaluating nil.loaded

I was expecting a SubjectGroup collection with all Subjects associated.

In both cases I saw the generated queries through logs and returns the
same query result.

Thank you for your attention,

Paulo Abreu

Hello,

I am having some difficulties with ActiveRecord.

What I want to do is to get a collection of SubjectGroups for using
with option_groups_from_collection_for_select


My Code:

=======================================class Subject < ActiveRecord::Base
 has_and_belongs_to_many :users
 belongs_to :subject_group
end

class SubjectGroup < ActiveRecord::Base
 has_many :subjects
end

@subjects= Subject.find(:all, :include => :subject_group)
@groups= SubjectGroup.find(:all, :include => :subjects)

The first find instruction runs just fine, the second gives me the
following error:

You have a nil object when you didn''t expect it!, The error occurred
while evaluating nil.loaded

I was expecting a SubjectGroup collection with all Subjects associated.

In both cases I saw the generated queries through logs and returns the
same query result.

Thank you for your attention,

Paulo Abreu

Hello,

I am having some difficulties with ActiveRecord.

What I want to do is to get a collection of SubjectGroups for using
with option_groups_from_collection_for_select


My Code:

=======================================class Subject < ActiveRecord::Base
 has_and_belongs_to_many :users
 belongs_to :subject_group
end

class SubjectGroup < ActiveRecord::Base
 has_many :subjects
end

@subjects= Subject.find(:all, :include => :subject_group)
@groups= SubjectGroup.find(:all, :include => :subjects)

The first find instruction runs just fine, the second gives me the
following error:

You have a nil object when you didn''t expect it!, The error occurred
while evaluating nil.loaded

I was expecting a SubjectGroup collection with all Subjects associated.

In both cases I saw the generated queries through logs and returns the
same query result.

Thank you for your attention,

Paulo Abreu

Paulo Abreu wrote:
> class SubjectGroup < ActiveRecord::Base
>  has_many :subjects
> end
> 
> @subjects= Subject.find(:all, :include => :subject_group)
> @groups= SubjectGroup.find(:all, :include => :subjects)
> 
> The first find instruction runs just fine, the second gives me the
> following error:
> 
> You have a nil object when you didn''t expect it!, The error
occurred
> while evaluating nil.loaded
Is that the entire code of your SubjectGroup model, or have you also
defined your own "subjects" method within it?

-- 
We develop, watch us RoR, in numbers too big to ignore.

On 7/15/06, Mark Reginald James <mrj@bigpond.net.au>
wrote:
> Paulo Abreu wrote:
>
> > class SubjectGroup < ActiveRecord::Base
> >  has_many :subjects
> > end
> >
> > @subjects= Subject.find(:all, :include => :subject_group)
> > @groups= SubjectGroup.find(:all, :include => :subjects)
> >
> > The first find instruction runs just fine, the second gives me the
> > following error:
> >
> > You have a nil object when you didn''t expect it!, The error
occurred
> > while evaluating nil.loaded
>
> Is that the entire code of your SubjectGroup model, or have you also
> defined your own "subjects" method within it?
>
The idia is to add my own methods for
option_groups_from_collection_for_select, however I am not able to
make this search. if I remove :include => :subjects it just works.

In the IRC channel someone told me that I have a Subject with a
subject_group_id that refers to a subject_group that doesnt exist, but
I already verified that.

Paulo Abreu

On 7/15/06, Mark Reginald James <mrj@bigpond.net.au>
wrote:
> Paulo Abreu wrote:
>
> > class SubjectGroup < ActiveRecord::Base
> >  has_many :subjects
> > end
> >
> > @subjects= Subject.find(:all, :include => :subject_group)
> > @groups= SubjectGroup.find(:all, :include => :subjects)
> >
> > The first find instruction runs just fine, the second gives me the
> > following error:
> >
> > You have a nil object when you didn''t expect it!, The error
occurred
> > while evaluating nil.loaded
>
> Is that the entire code of your SubjectGroup model, or have you also
> defined your own "subjects" method within it?
>
Oh sorry, I did not answer to your question. Is the entire code, no
methods added yet.

Paulo Abreu

>
> Oh sorry, I did not answer to your question. Is the entire code, no
> methods added yet.
Oh god, I think I need to sleep :| in fact I had two member functions,
that was the problem.

Paulo Abreu.