Rails - Jan 2006 - What am I doing wrong!!!

Hi:


@x = Invoice.find(:first)

if @x
	do one thing
else
	do another
end


This ought to work but does not.  I think that @x is nil but if I  
test for existance or @x != nil or @x.attribute != nil - my code does  
not respond correctly.  What is the value of @x if there are no  
records yet in the invoices table?

Thanks in advance.

bruce

bruce balmer wrote:
> Hi:
> 
> 
> @x = Invoice.find(:first)
> 
> if @x
> 	do one thing
> else
> 	do another
> end
> 
> 
> This ought to work but does not.  I think that @x is nil but if I
> test for existance or @x != nil or @x.attribute != nil - my code does
> not respond correctly.  What is the value of @x if there are no
> records yet in the invoices table?
> 
> Thanks in advance.
> 
> bruce
Ruby is really particular about logical tests, try this..

if @x.nil? then
  do one thing
else
  do something else
end

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

Bruce Balmer wrote:
> @x = Invoice.find(:first)
> 
> if @x
>     do one thing
> else
>     do another
> end
> 
> 
> This ought to work but does not.  I think that @x is nil but if I  test 
> for existance or @x != nil or @x.attribute != nil - my code does  not 
> respond correctly.  What is the value of @x if there are no  records yet 
> in the invoices table?
It''s easy to answer this for yourself by running script/console in your
project:

$ script/console
Loading development environment
 >> invoices = Invoice.find(:all)
=> []
 >> inv = Invoice.find(:first)
=> nil

I assume you are already familiar with using irb to try out ideas in 
Ruby - it''s essential!

regards

   Justin

Thanks Justin. No I was not familiar with using the script/console in  
this manner and although i am familiar with Irb, I was not aware of  
its application in situations like this. other than that I was right  
on top of things :-)  I appreciate your help.

bruce


On 5-Jan-06, at 10:13 PM, Justin Forder wrote:
> Bruce Balmer wrote:
>
>> @x = Invoice.find(:first)
>> if @x
>>     do one thing
>> else
>>     do another
>> end
>> This ought to work but does not.  I think that @x is nil but if I   
>> test for existance or @x != nil or @x.attribute != nil - my code  
>> does  not respond correctly.  What is the value of @x if there are  
>> no  records yet in the invoices table?
>
> It''s easy to answer this for yourself by running script/console in
> your project:
>
> $ script/console
> Loading development environment
> >> invoices = Invoice.find(:all)
> => []
> >> inv = Invoice.find(:first)
> => nil
>
> I assume you are already familiar with using irb to try out ideas  
> in Ruby - it''s essential!
>
> regards
>
>   Justin
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