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?

Brian,
hello first,

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
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,

РJean-Fran̤ois.


Ã? la renverse.

On Oct 2, 2006, at 7:07 AM, Jean-François wrote:

belongs_to :foo

want given a foo record, from the collection of bars associated with,

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
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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