Rails - Oct 2005 - creating new objects with associations

something that is perplexing me..

i have the following relationship say:

CREATE TABLE `binaries` (
  `id` int(11) NOT NULL auto_increment,
  `data` blob NOT NULL,
  `datafile_id` int(11) NOT NULL default ''0'',
  PRIMARY KEY  (`id`)
)

CREATE TABLE `datafiles` (
  `id` int(11) NOT NULL auto_increment,
  PRIMARY KEY  (`id`)
)

in datafile.rb I have

class Datafile < ActiveRecord::Base
	has_one :binary, :dependent => true
end

and in binary.rb i have

class Binary < ActiveRecord::Base
	belongs_to :datafile
end


now, when i want to create a new datafile object and then inturn add
data to the associated ''binary'' object i would like to do this

@datafile = Datafile.new
@datafile.binary.data = ''blah''

but I CANT. how am i doing this incorrectly? I thought that i could
reference the associated object this way. i can not even created the
associated object like this either:

@datafile = Datafile.new
@datafile.binary = Binary.new
@datafile.binary.data = ''blah''

there must be an easier way than something like this:

@datafile = Datafile.new
@datafile.save
@binary = Binary.new
@binary.datafile_id = @datafile.id
@binary.save

I feel like i have missed something simple

-felix

>
> now, when i want to create a new datafile object and then inturn add
> data to the associated ''binary'' object i would like to do
this
>
> @datafile = Datafile.new
> @datafile.binary.data = ''blah''
>
> but I CANT. how am i doing this incorrectly? I thought that i could
> reference the associated object this way. i can not even created the
> associated object like this either:
>
> @datafile = Datafile.new
> @datafile.binary = Binary.new
> @datafile.binary.data = ''blah''
>
> there must be an easier way than something like this:
>
> @datafile = Datafile.new
> @datafile.save
> @binary = Binary.new
> @binary.datafile_id = @datafile.id
> @binary.save
>
> I feel like i have missed something simple
Might that be

@datafile = Datafile.new
@datafile.build_binary(:data=>''blah'')

or
@datafile.create_binary(:data=>''blah'')

-- 
Julian "Julik" Tarkhanov

Julian ''Julik'' Tarkhanov wrote:
>>
>> now, when i want to create a new datafile object and then inturn add
>> data to the associated ''binary'' object i would like
to do this
>>
>> @datafile = Datafile.new
>> @datafile.binary.data = ''blah''
>>
>> but I CANT. how am i doing this incorrectly? I thought that i could
>> reference the associated object this way. i can not even created the
>> associated object like this either:
>>
>> @datafile = Datafile.new
>> @datafile.binary = Binary.new
>> @datafile.binary.data = ''blah''
>>
>> there must be an easier way than something like this:
>>
>> @datafile = Datafile.new
>> @datafile.save
>> @binary = Binary.new
>> @binary.datafile_id = @datafile.id
>> @binary.save
>>
>> I feel like i have missed something simple
> 
> Might that be
> 
> @datafile = Datafile.new
> @datafile.build_binary(:data=>''blah'')
> 
> or
> @datafile.create_binary(:data=>''blah'')
> 
it seems that neither of them do anything, both return ''undefined
method''

a quick look at the public methods available to the @file object
revealed none usable for this task. any other ideas

-felix

I think what you''re after is

@datafile = Datafile.new
@datafile.binary.data << ''blah''
@datafile.save

I haven''t tested this though

On 10/6/05, Felix McCoey
<felix.mccoey-8PZlF8N9LqR+XZJcv9eMoEEOCMrvLtNR@public.gmane.org>
wrote:
>
>
>
> Julian ''Julik'' Tarkhanov wrote:
> >>
> >> now, when i want to create a new datafile object and then inturn
add
> >> data to the associated ''binary'' object i would
like to do this
> >>
> >> @datafile = Datafile.new
> >> @datafile.binary.data = ''blah''
> >>
> >> but I CANT. how am i doing this incorrectly? I thought that i
could
> >> reference the associated object this way. i can not even created
the
> >> associated object like this either:
> >>
> >> @datafile = Datafile.new
> >> @datafile.binary = Binary.new
> >> @datafile.binary.data = ''blah''
> >>
> >> there must be an easier way than something like this:
> >>
> >> @datafile = Datafile.new
> >> @datafile.save
> >> @binary = Binary.new
> >> @binary.datafile_id = @datafile.id <http://datafile.id>
> >> @binary.save
> >>
> >> I feel like i have missed something simple
> >
> > Might that be
> >
> > @datafile = Datafile.new
> > @datafile.build_binary(:data=>''blah'')
> >
> > or
> > @datafile.create_binary (:data=>''blah'')
> >
>
> it seems that neither of them do anything, both return ''undefined
method''
>
> a quick look at the public methods available to the @file object
> revealed none usable for this task. any other ideas
>
> -felix
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

_______________________________________________
Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails