Rails - Jun 2006 - Manipulating collections

I appreciate this is basic stuff but can''t seem to find the answer 
anywhere using Google. If someone could point me in the direction of 
some documentation on this I would be very appreciative.

If I have a collection as follows:

@stuff = Stuff.find_by_type(''new'')

And I then want to add something onto it, how can I add to this 
collection?

Additionally how could I go through the collection and say change or add 
an attribute after matching certain objects?

many thanks,

Chris


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

Chris Birkinshaw wrote:
> I appreciate this is basic stuff but can''t seem to find the answer
> anywhere using Google. If someone could point me in the direction of 
> some documentation on this I would be very appreciative.
> 
> If I have a collection as follows:
> @stuff = Stuff.find_by_type(''new'')
> 
> And I then want to add something onto it, how can I add to this 
> collection?
ActiveRecord finders return arrays of ActiveRecord objects.  So treat 
them like you would any other array.

  @stuff = Stuff.find_by_type(''new'')
  new_stuff = Stuff.create(:foo => ''bar'')
  @stuff << new_stuff
> Additionally how could I go through the collection and say change or add 
> an attribute after matching certain objects?
  @fitered_stuff = @stuff.find do |object| #array.find not 
active_record.find
    object.foo == ''bar''
  end
  @filtered_stuff.each do |row|
    row.update_attribute :foo, ''baz''
  end

Although you may be better off only pulling the relevant records from 
the DB rather than filtering them after the fact.  SQL is very good at 
that sort of thing.


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

Thanks for the reply, that has helped me enourmously.

Chris





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