On Feb 8, 3:33 pm, David Kahn <[email protected]> wrote: > On Tue, Feb 8, 2011 at 9:06 AM, Frederick Cheung <[email protected] > > I see, I guess I got confused as I use ActiveRecord so much and within a > each block, by setting values and calling save it of course saves the > object. Is there a way to achieve what I am presenting, though, passing a > batch of variables and having them operated on and changed?
that is very different. doing some_object.foo = 'bar' is calling a method on an object that changes its state, whereas foo = bar just points a local variable at something new. (and in addition Fixnums/BigDecimal are immutable - there is no method you can call on a number to change it into another nmber) > > Excuse my ingenuity, but I am trying to understand... if I have an array of > variables it seems that when the array is created, the elements which were > variables are substituted by values, and there is no reference: > (rdb:1) arr = [v1,v2,v3] > [1, 2, 3] Without resorting to dirty tricks, you can't change the values of local variables other than by actually doing v1 = 2. arr does NOT contain [v1,v2,v3]. It contains 3 objects, and the local variables v1,v2,v3 just happen to also be referencing those same objects. Fred > (rdb:1) v1 > 1 > (rdb:1) arr[0]=5 > 5 > (rdb:1) v1 > 1 > > This must sound like kindergarten but apparently I have been working albeit > successfully under some very false premises. > > > > > > > Fred > > > -- > > 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 [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group at > >http://groups.google.com/group/rubyonrails-talk?hl=en. -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
