Rails - Jan 2010 - Dynamic attributes!

I want to create a general model ''Product'' that I will be able
to
store several attributes in it.

For example the attributes

:id
:name
:description


are pretty stantard. So each product will have this attributes.

However, I wanted to know if it is possible to create dynamic
attributes.
In the case of a cell phone device I might want to store the IMEI of
the phone, this attribute is useless if the product is a laptop.

Is there any whey to create dynamic attributes ?

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You may look into Single table inheritance to see if that''ll suit your
needs. Otherwise you could look into something like mongomapper and
mongodb.

On Jan 24, 11:51 pm, Demec <de...-ee4meeAH724@public.gmane.org>
wrote:
> I want to create a general model ''Product'' that I will be
able to
> store several attributes in it.
>
> For example the attributes
>
> :id
> :name
> :description
>
> are pretty stantard. So each product will have this attributes.
>
> However, I wanted to know if it is possible to create dynamic
> attributes.
> In the case of a cell phone device I might want to store the IMEI of
> the phone, this attribute is useless if the product is a laptop.
>
> Is there any whey to create dynamic attributes ?
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Matt W. wrote:
> You may look into Single table inheritance to see if that''ll suit
your
> needs. 
STI won''t do the trick here.  Multiple-table inheritance might.

Or you could have a separate Attribute model, or (ugly) put all the 
"extra" attributes into a serialized Hash.

But really, you should probably have several different tables, not the 
undifferentiated Product.
> Otherwise you could look into something like mongomapper and
> mongodb.
Or CouchDB.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

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If you wanna search across this dynamic attributes, you might take a
look at acts_as_solr_reloaded, it has support for dynamic attributes:

http://github.com/dcrec1/acts_as_solr_reloaded

you just need to run a migration:

script/generate dynamic_attributes_migration

and then define your model like this:

acts_as_solr :dynamic_attributes => true

This will anotate your model like:

has_many :dynamic_attributes

where DynamicAttribute is a class with name and value properties,
like:

DynamicAttribute.new :name => ''imei'', :value =>
''123456-12-123456-1''

Then you can search like this:

Product.search "imei:''123456-12-123456-1''"

More info here:

http://www.diegocarrion.com/2010/01/18/thinkingsphinx-exits-enters-actsassolrreloaded/

cheers

On Jan 25, 4:23 pm, Marnen Laibow-Koser
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> Matt W. wrote:
> > You may look into Single table inheritance to see if that''ll
suit your
> > needs.
>
> STI won''t do the trick here.  Multiple-table inheritance might.
>
> Or you could have a separate Attribute model, or (ugly) put all the
> "extra" attributes into a serialized Hash.
>
> But really, you should probably have several different tables, not the
> undifferentiated Product.
>
> > Otherwise you could look into something like mongomapper and
> > mongodb.
>
> Or CouchDB.
>
> Best,
> --
> Marnen Laibow-Koserhttp://www.marnen.org
> mar...-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
> --
> Posted viahttp://www.ruby-forum.com/.
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