Rails - Oct 2006 - acts_as_hash ?

here''s what I want to do:

class Foo < ActiveRecord::Base
    has_many :bars
end

class Bar < ActiveRecord::Base
    belongs_to :foo
    acts_as_hash :scope => :foo_id, :key => :keycolumn
end

foo = Foo.find(...)
bar = foo.bars[''my_key'']


Is there an existing acts_as_hash plugin, or any other good way to do
this?


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Brian,
hello first,
> here's what I want to do:
>
> class Foo < ActiveRecord::Base
>     has_many :bars
> end
>
> class Bar < ActiveRecord::Base
>     belongs_to :foo
>     acts_as_hash :scope => :foo_id, :key => :keycolumn
> end
>
> foo = Foo.find(...)
> bar = foo.bars['my_key']
>
> Is there an existing acts_as_hash plugin, or any other good way to do
> this?
I'm not sure to understand well what you want to do, but if you
want given a foo record, from the collection of bars associated with,
to retrieve one with a given condition, you can do sth like that
(using association extensions) :

class Foo < AR::B
  has_many :bars do
    def [](key)
      find(:first, :conditions => ['my_column = ?', key.to_s])
    end
  end
end

then bar = foo.bars['hello'] will be the record with
foo_id = foo.id and my_column = 'hello'.

hope it helps,

   -- Jean-François.

-- 
À la renverse.

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On Oct 2, 2006, at 7:07 AM, Jean-François wrote:
> Brian,
> hello first,
>
>> here''s what I want to do:
>>
>> class Foo < ActiveRecord::Base
>>     has_many :bars
>> end
>>
>> class Bar < ActiveRecord::Base
>>     belongs_to :foo
>>     acts_as_hash :scope => :foo_id, :key => :keycolumn
>> end
>>
>> foo = Foo.find(...)
>> bar = foo.bars[''my_key'']
>>
>> Is there an existing acts_as_hash plugin, or any other good way to do
>> this?
>
> I''m not sure to understand well what you want to do, but if you
> want given a foo record, from the collection of bars associated with,
> to retrieve one with a given condition, you can do sth like that
> (using association extensions) :
>
> class Foo < AR::B
>   has_many :bars do
>     def [](key)
>       find(:first, :conditions => [''my_column = ?'',
key.to_s])
>     end
>   end
> end
>
> then bar = foo.bars[''hello''] will be the record with
> foo_id = foo.id and my_column = ''hello''.
>
> hope it helps,
>
>    -- Jean-François.

	Here is a little DbHash model I have used in the past. You could add  
a foreign key to it so it works with your relationship.

class DbHash < ActiveRecord::Base
   class << self
     def [](key)
       pair = find_by_key(key.to_s)
       pair.value unless pair.nil?
     end

     def []=(key, value)
       pair = find_by_key(key)
       unless pair
         pair = new
         pair.key, pair.value = key.to_s, value
         pair.save
       else
         pair.value = value
         pair.save
       end
       value
     end

     def to_hash
       Hash[ *find_all.map { |pair| [pair.key, pair.value] }.flatten ]
     end
   end
end

     create_table "db_hashes", :force => true do |t|
       t.column "key", :string, :limit => 40, :default =>
"", :null
=> false
       t.column "value", :string, :default => ""
     end

-EZra








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