[Rails] How does the save method work with has_many? Code Details.

Charlie Hubbard
Thu, 24 Aug 2006 15:41:18 -0000

Hi,

I''m trying to fix a plugin that is adding the equivalent of a has_many
relationship to an object.  Here is what I understand has_many does and
how it mixins in with the concrete object.  If I have an object Foo and
it has_many Bars then here is the code:

class Foo < ActiveRecord::Base
  has_many :bars
end

What that does is add several methods to manage that relationship, and
it stores an array under the @bars instance variable that stores the
individual instances of Bar.  Now regular fields from the database are
stored in @attributes instance variable.  What I''m a little fuzzy on is
how does save know to commit both attributes and the @bars instance
variable when the user calls save method?

Effectively I''m trying to modify a plugin so that it will cache this
collection similiar to has_many, and it will commit that collection when
you save.  Right now it is always commiting and always reading from the
datbase and stores nothing in memory.

Charlie

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