Hi
I have two arrays of items, and I want to cycle one and see if its
items are on the other one, but I can''t find out how to do it...
I''ve
been trying to do something like this
@a = Item.find(:all, :conditions => "name LIKE
''%a%''")
@b = Item.find(:all, :conditions => "name LIKE
''%b%''")
for i in @a
if @a.find(i)
do stuff
else
do something else
end
end
and I keep getting a "no block given" error on the if line... if @a is
an array, i can search using find, and I believe I can use the
object... I''ve tried a find_by_id but I got an "undefined method
for
array" error...
Any ideas?
Thanks
Carlos Fonseca
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If I''m understanding you correctly, you''re trying to check if
each
element in array @a is present in array @b and act accordingly,
something like:
@a.each do |item|
if @b.include? item
[do stuff]
else
[do other stuff]
end
end
It would be more performant (but less readable) to do something like
this:
( @a & @b ).each do |item|
[do stuff]
end
( @a - @b ).each do |item|
[ do other stuff ]
end
On Sep 3, 8:21 pm, Carlos Fonseca
<carlosefons...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Hi
>
> I have two arrays of items, and I want to cycle one and see if its
> items are on the other one, but I can''t find out how to do it...
I''ve
> been trying to do something like this
>
> @a = Item.find(:all, :conditions => "name LIKE
''%a%''")
> @b = Item.find(:all, :conditions => "name LIKE
''%b%''")
>
> for i in @a
> if @a.find(i)
> do stuff
> else
> do something else
> end
> end
>
> and I keep getting a "no block given" error on the if line... if
@a is
> an array, i can search using find, and I believe I can use the
> object... I''ve tried a find_by_id but I got an "undefined
method for
> array" error...
>
> Any ideas?
> Thanks
> Carlos Fonseca
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I tried the .include?( item ) but it didn''t work back then and I forgot to mention it yesterday. No idea why it wasn''t working but now it works! Thanks :D On Sep 4, 3:35 am, Rein Henrichs <rein.henri...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> If I''m understanding you correctly, you''re trying to check if each > element in array @a is present in array @b and act accordingly, > something like: > > @a.each do |item| > if @b.include? item > [do stuff] > else > [do other stuff] > end > end > > It would be more performant (but less readable) to do something like > this: > > ( @a & @b ).each do |item| > [do stuff] > end > > ( @a - @b ).each do |item| > [ do other stuff ] > end > > On Sep 3, 8:21 pm, Carlos Fonseca <carlosefons...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > Hi > > > I have two arrays of items, and I want to cycle one and see if its > > items are on the other one, but I can''t find out how to do it... I''ve > > been trying to do something like this > > > @a = Item.find(:all, :conditions => "name LIKE ''%a%''") > > @b = Item.find(:all, :conditions => "name LIKE ''%b%''") > > > for i in @a > > if @a.find(i) > > do stuff > > else > > do something else > > end > > end > > > and I keep getting a "no block given" error on the if line... if @a is > > an array, i can search using find, and I believe I can use the > > object... I''ve tried a find_by_id but I got an "undefined method for > > array" error... > > > Any ideas? > > Thanks > > Carlos Fonseca--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---