Rails - Oct 2006 - object.send("collection <<", something) doesn't work?

I''ve run into a problem with what I need to do.  So let''s say
I have an
ActiveRecord object called Review which has_many :computers.  If I have 
an instance of Review and call review.computers << computer that works 
fine.  But if I do review.send(''computers << '',
computer) that does not
work and I get method_missing.  Is there a reason for this?  Thanks for 
the help!

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Aaron Wieberg wrote:
> I''ve run into a problem with what I need to do.  So let''s
say I have an
> ActiveRecord object called Review which has_many :computers.  If I have 
> an instance of Review and call review.computers << computer that
works
> fine.  But if I do review.send(''computers << '',
computer) that does not
> work and I get method_missing.  Is there a reason for this?  Thanks for 
> the help!
Wouldn''t you have to do either:

review.computers.send(''<<'', computer)

OR

review.send(''computers<<'', computer)

I don''t think there are any embedded spaces in method names, ever 
(except when your database column has an embedded space for ActiveRecord 
classes).

Wes


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Wes Gamble wrote:
> Aaron Wieberg wrote:
>> I''ve run into a problem with what I need to do.  So
let''s say I have an
>> ActiveRecord object called Review which has_many :computers.  If I have
>> an instance of Review and call review.computers << computer that
works
>> fine.  But if I do review.send(''computers << '',
computer) that does not
>> work and I get method_missing.  Is there a reason for this?  Thanks for
>> the help!
> 
> Wouldn''t you have to do either:
> 
> review.computers.send(''<<'', computer)
> 
> OR
> 
> review.send(''computers<<'', computer)
> 
> I don''t think there are any embedded spaces in method names, ever 
> (except when your database column has an embedded space for ActiveRecord 
> classes).
> 
> Wes
review.send(''computers<<'', computer) fails regardless of
the spaces.

review.computers.send(''<<'', computer) does work, but I
still need to do
the other way because I store the name of the collection in the database 
so I can do  review.send("#{collection_name}<<", something)
depending on
what collection I''m handling.

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Aaron Wieberg wrote:
> Wes Gamble wrote:
>> Aaron Wieberg wrote:
>>> I''ve run into a problem with what I need to do.  So
let''s say I have an
>>> ActiveRecord object called Review which has_many :computers.  If I
have
>>> an instance of Review and call review.computers << computer
that works
>>> fine.  But if I do review.send(''computers <<
'', computer) that does not
>>> work and I get method_missing.  Is there a reason for this?  Thanks
for
>>> the help!
>> 
>> Wouldn''t you have to do either:
>> 
>> review.computers.send(''<<'', computer)
>> 
>> OR
>> 
>> review.send(''computers<<'', computer)
>> 
>> I don''t think there are any embedded spaces in method names,
ever
>> (except when your database column has an embedded space for
ActiveRecord
>> classes).
>> 
>> Wes
> 
> review.send(''computers<<'', computer) fails
regardless of the spaces.
> 
> review.computers.send(''<<'', computer) does work,
but I still need to do
> the other way because I store the name of the collection in the database 
> so I can do  review.send("#{collection_name}<<", something)
depending on
> what collection I''m handling.
You can do something like this:

eval("review.#{collection_name}.send(''<<'',
something)")

which will substitute collection name into a string that is then
eval''ed

or you can do

intermediate_collection = review.send(collection_name)
intermediate_collection << something

Wes

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> You can do something like this:
> 
> eval("review.#{collection_name}.send(''<<'',
something)")
> 
> which will substitute collection name into a string that is then
eval''ed
> 
> or you can do
> 
> intermediate_collection = review.send(collection_name)
> intermediate_collection << something
> 
> Wes
Thanks for the help Wes! review.send(collection_name) << something works
just fine.

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Aaron Wieberg wrote:
> review.send(''computers<<'', computer) fails
regardless of the spaces.
That''s because there is no method named "computers<<"
on the review
object. There is, however, a method named "<<" on the object
returned
by the call to the review.computers method.

If your collection is dynamically named, then you can use send twice to
get the appropriate collection:
  review.send( collection_name ).send( ''<<'', computer )

Hope that helps,
Gavin


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Aaron Wieberg wrote:
>> You can do something like this:
>> 
>> eval("review.#{collection_name}.send(''<<'',
something)")
>> 
>> which will substitute collection name into a string that is then
eval''ed
>> 
>> or you can do
>> 
>> intermediate_collection = review.send(collection_name)
>> intermediate_collection << something
>> 
>> Wes
> 
> Thanks for the help Wes! review.send(collection_name) << something
works
> just fine.
Even better.  Ain''t Ruby purdy :)?

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Wes Gamble wrote:
> Even better.  Ain''t Ruby purdy :)?
Gorgeous! :) Thanks again

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