I have a problem with creating objects from database records.
In the model Room I have declared instance variable (at the beginning
of a class)
@exits = {:south=>nil, :north=>nil}
The database has been already populated with rooms.
Now, if somewhere in a program i use Room.find(1), I get the object
room, however it doesn''t see the @exists hash. How can I make it see
it?
I''m totally new to RoR and this being probably straightforward problem
just drives me maaad. Help please.
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I imagine your code looks like this;
class Klass < ActiveRecord::Base
attr_reader :exits
@exits = {:south => nil, :north => nil}
end
this will set an instance variable, but for the class.
this will work nicely.
class Klass < ActiveRecord::Base
DEFAULT_EXITS = {:south => nil, :north => nil}
def exits
@exits ||= DEFAULT_EXITS.dup
end
attr_writer :exits
end
Is that what you want?
michau wrote:> I have a problem with creating objects from database records.
> In the model Room I have declared instance variable (at the beginning
> of a class)
>
> @exits = {:south=>nil, :north=>nil}
>
> The database has been already populated with rooms.
>
> Now, if somewhere in a program i use Room.find(1), I get the object
> room, however it doesn''t see the @exists hash. How can I make it
see
> it?
> I''m totally new to RoR and this being probably straightforward
problem
> just drives me maaad. Help please.
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I think not... Basically I want to have an instance variable, that is not related to any column from the database mapped to the object. And I want to be able to see that instance variable when creating the object through ModelName.find(id). On Jul 9, 2:37 pm, Matthew Rudy <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> I imagine your code looks like this; > > class Klass < ActiveRecord::Base > attr_reader :exits > > @exits = {:south => nil, :north => nil} > end > > this will set an instance variable, but for the class. > this will work nicely. > > class Klass < ActiveRecord::Base > DEFAULT_EXITS = {:south => nil, :north => nil} > def exits > @exits ||= DEFAULT_EXITS.dup > end > attr_writer :exits > end > > Is that what you want? > > michau wrote: > > I have a problem with creating objects from database records. > > In the model Room I have declared instance variable (at the beginning > > of a class) > > > @exits = {:south=>nil, :north=>nil} > > > The database has been already populated with rooms. > > > Now, if somewhere in a program i use Room.find(1), I get the object > > room, however it doesn''t see the @exists hash. How can I make it see > > it? > > I''m totally new to RoR and this being probably straightforward problem > > just drives me maaad. Help please. > > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
ok,
well, I suggest you try the code I gave you.
but it won''t set the variable until you try to call it.
If you really want it to be set when you find, then i think this''ll
work,
but it''s hacky.
class Klass < ActiveRecord::Base
DEFAULT_EXITS = {:south => nil, :north => nil}
attr_accessor :exits
def initialize(*args)
@exits = DEFAULT_EXITS.dup
super(*args)
end
end
michau wrote:> I think not... Basically I want to have an instance variable, that is
> not related to any column from the database mapped to the object. And
> I want to be able to see that instance variable when creating the
> object through ModelName.find(id).
>
>
>
> On Jul 9, 2:37 pm, Matthew Rudy
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
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