From: Todd <toddkennethbenson@...>
Date: 2005-12-05T11:02:50+09:00
Subject: Re: Deleting object inn array, if...

Henrik Orm�sen wrote:
> Thanks for the fast replay's, I'm impressed :-).
>
> Her is my DB thing:
>
> class Item
>   attr_reader :body
>
>   FAKE_DATABASE = []
>
>   def initialize(body)
>     @body = body
>   end
>   def add
>     FAKE_DATABASE.unshift(self)
>   end
>   def self.find_recent
>      FAKE_DATABASE
>   end
>   def del
>     FAKE_DATABASE.delete_if {|x| x.body == @body }
>   end
> end
>
>
> - Henrik

Sounds maybe you are trying to do something like:

<irb(main):001:0> class Item
<irb(main):002:1>   attr_reader :body
<irb(main):003:1>   @@db = []
<irb(main):004:1>   def initialize( body ) @body=body end
<irb(main):005:1>   def add() unshift.self end
<irb(main):006:1>   def recent() @@db end
<irb(main):007:1>   def del @@db.delete_if { |x| x.body==@body }
<irb(main):008:1> end
=> nil

<irb(main):009:0> a = Item.new "a"
=> #<Item:oxb7ca1120 @body="a">

<irb(main):010:0> b = Item.new "b"
=> #<Item:0xb7c9c314 @body="b">

<irb(main):011:0> a.add
=> [#<Item:0xb7ca1120 @body="a">]

<irb(main):012:0> b.add
=> [#<Item:0xb7c9c314 @body="b">, #<Item:0xb7ca1120 @body="a">]

<irb(main):013:0> a.recent
=> same thing as above

<irb(main):014:0> b.recent
=> same thing as above

<irb(main):015:0> a.add
=> [#<item:0xb7ca1120 @body="a", #<Item:0xb7c9c314 @body="b">,
#<Item:0xb7ca1120 @body="a">]
note there are 2 "a" objects in the same db, you probably don't want
this, so will have to change your add method accordingly

<irb(main):016:0> a.recent == b.recent
=> true

<irb(main):017:0> a.del
=> [#<item:0xb7ca9c314 @body="b">]

<irb(main):018:0> b.del
=> []

<irb(main):019:0> a.recent == b.recent
=> true

At least that's the direction you look like you are headed.

hth,
Todd