Rails - Feb 2006 - Where is the send() function?

Hi,

in the tutorial "4 Days on Rails" the following code fragment is used:

,----
|   <% for column in Category.content_columns %>
|     <td><%=h category.send(column.name) %></td>
|   <% end %>
`----

Apparently, the send() function returns the column value by name, but
where does this function comes from? Unfortunately, neither the tutorial
nor the API documentation tell it.

-- 
\  /                                       vlad@hashbang.de
 \/lad                                     http://www.hashbang.de

http://www.ruby-doc.org/docs/ProgrammingRuby/html/ref_c_object.html#Object.send

On 01/02/06, Vlad Berditchevskiy <vlad@hashbang.de>
wrote:
>
> Hi,
>
> in the tutorial "4 Days on Rails" the following code fragment is
used:
>
> ,----
> |   <% for column in Category.content_columns %>
> |     <td><%=h category.send(column.name) %></td>
> |   <% end %>
> `----
>
> Apparently, the send() function returns the column value by name, but
> where does this function comes from? Unfortunately, neither the tutorial
> nor the API documentation tell it.
>
> --
> \  /                                       vlad@hashbang.de
> \/lad                                     http://www.hashbang.de
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://wrath.rubyonrails.org/pipermail/rails/attachments/20060201/f1da280f/attachment.html

On Feb 1, 2006, at 9:37 AM, Gael Pourriel wrote:
> On 01/02/06, Vlad Berditchevskiy <vlad@hashbang.de> wrote: Hi,
>
>> in the tutorial "4 Days on Rails" the following code fragment
is
>> used:
>>
>> ,----
>> |   <% for column in Category.content_columns %>
>> |     <td><%=h category.send( column.name) %></td>
>> |   <% end %>
>> `----
>>
>> Apparently, the send() function returns the column value by name, but
>> where does this function comes from? Unfortunately, neither the  
>> tutorial
>> nor the API documentation tell it.
>
> http://www.ruby-doc.org/docs/ProgrammingRuby/html/ 
> ref_c_object.html#Object.send
No need to search the web:

$ ri send
------------------------------------------------------------ Object#send
      obj.send(symbol [, args...])        => obj
      obj.__send__(symbol [, args...])    => obj
------------------------------------------------------------------------
      Invokes the method identified by _symbol_, passing it any  
arguments
      specified. You can use +__send__+ if the name +send+ clashes with
      an existing method in _obj_.

         class Klass
           def hello(*args)
             "Hello " + args.join('' '')
           end
         end
         k = Klass.new
         k.send :hello, "gentle", "readers"   #=>
"Hello gentle readers"

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

send and __send__ are methods on the Object class in Ruby.

"Invokes the method identified by symbol, passing it any arguments and
block."


Bob Silva
http://www.railtie.net/
> -----Original Message-----
> From: rails-bounces@lists.rubyonrails.org [mailto:rails-
> bounces@lists.rubyonrails.org] On Behalf Of Vlad Berditchevskiy
> Sent: Wednesday, February 01, 2006 9:24 AM
> To: rails@lists.rubyonrails.org
> Subject: [Rails] Where is the send() function?
> 
> Hi,
> 
> in the tutorial "4 Days on Rails" the following code fragment is
used:
> 
> ,----
> |   <% for column in Category.content_columns %>
> |     <td><%=h category.send(column.name) %></td>
> |   <% end %>
> `----
> 
> Apparently, the send() function returns the column value by name, but
> where does this function comes from? Unfortunately, neither the tutorial
> nor the API documentation tell it.
> 
> --
> \  /                                       vlad@hashbang.de
>  \/lad                                     http://www.hashbang.de
> 
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Vlad Berditchevskiy wrote:
> Hi,
> 
> in the tutorial "4 Days on Rails" the following code fragment is
used:
> 
> ,----
> |   <% for column in Category.content_columns %>
> |     <td><%=h category.send(column.name) %></td>
> |   <% end %>
> `----
> 
> Apparently, the send() function returns the column value by name, but
> where does this function comes from? Unfortunately, neither the tutorial
> nor the API documentation tell it.
> 
> --
> \  /                                       vlad@hashbang.de
>  \/lad                                     http://www.hashbang.de
Consider this:

-1.send("abs")


-- 
Posted via http://www.ruby-forum.com/.