I have an ActiveRecord model with a field called default_pic. I can''t
figure out why the first example DOES NOT work and the second one does,
I''m
not sure why I need the self[]
*Doesn''t Work*
def set_default_pic
default_pic = "d#{(1..8).rand}.gif"
save
end
*Works:*
def set_default_pic
*self[:default_pic]* = "d#{(1..8).rand}.gif"
save
end
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On Jan 7, 2008 1:57 PM, blinking bear <blinkingbear-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> I have an ActiveRecord model with a field called default_pic. I can''t > figure out why the first example DOES NOT work and the second one doesIt''s a Ruby syntax thing.> def set_default_pic > default_pic = "d#{(1..8).rand}.gif" > save > endThat sets a local variable named default_pic. In order to call the accessor method, you need to do self.default_pic = "d#{(1..8).rand}.gif" There''s some page in the pickaxe which describes it. I don''t have it beside me, sorry. Pat --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
On Jan 7, 2008, at 4:04 PM, Pat Maddox wrote:> On Jan 7, 2008 1:57 PM, blinking bear <blinkingbear-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: >> I have an ActiveRecord model with a field called default_pic. I >> can''t >> figure out why the first example DOES NOT work and the second one >> does > > It''s a Ruby syntax thing. > >> def set_default_pic >> default_pic = "d#{(1..8).rand}.gif" >> save >> end > > That sets a local variable named default_pic. In order to call the > accessor method, you need to do > > self.default_pic = "d#{(1..8).rand}.gif" > > There''s some page in the pickaxe which describes it. I don''t have it > beside me, sorry. > > PatIt''s also an "ActiveRecord handles attributes with method_missing" thing. The idiomatic way of doing the same thing would be to use ActiveRecord::Base#update_attribute. def set_default_pic update_attribute(:default_pic, "d#{(1..8).rand}.gif") end Or, if this is part of a before_create callback, simply: def set_default_pic write_attribute(:default_pic, "d#{(1..8).rand}.gif") end assuming, of course, that you have defined Range#rand somewhere to be a random item from the Range. (If not, perhaps you want (1+rand(8)) instead.) -Rob Rob Biedenharn http://agileconsultingllc.com Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---