Rails - Jul 2008 - Identifying the attributes of an object dynamically

Hello

I have an object ''details'' which comprises of many attributes
like

name
address.city
address.state
department.name

For a given object of ''details'', I am trying to obtain the
values of
some attributes from a given list ("name","department.name
"), say from
the config. I tried iterating over the list and access the object''s
attrib using instance_variable_get, but ended up with the error

(["name"] is not a symbol)

Is there something incorrect that I am trying to do ?

~Shankar.
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On 7 Jul 2008, at 12:29, Shankar Narayanan wrote:
>
> Hello
>
> I have an object ''details'' which comprises of many
attributes like
>
> name
> address.city
> address.state
> department.name
>
> For a given object of ''details'', I am trying to obtain
the values of
> some attributes from a given list ("name","department.name
"), say
> from
> the config. I tried iterating over the list and access the
object''s
> attrib using instance_variable_get, but ended up with the error
>
Assuming you are talking about an ActiveRecord object, database  
attributes are not instance variables. attributes surprisingly enough  
contains all the attributes.

Fred
> (["name"] is not a symbol)
>
> Is there something incorrect that I am trying to do ?
>
> ~Shankar.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Frederick Cheung wrote:
> Assuming you are talking about an ActiveRecord object, database
> attributes are not instance variables. attributes surprisingly enough
> contains all the attributes.
> 
> Fred
Ah! yes.. thanks for pointing that out, Fred. But is there something 
like ''attributes_get'' that I should be using to get the values
of the
attribute in my case ?

~Shankar.
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> Ah! yes.. thanks for pointing that out, Fred. But is there something 
> like ''attributes_get'' that I should be using to get the
values of the
> attribute in my case ?
> 
> ~Shankar.
Aww.. was really a very dumb question to ask... :(

object.attributes[<attr_name>] would obviously give the value..

Thanks for the help, Fred. Appreciate it !!

~Shankar.
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