From: Junkone <junkone1@...>
Date: 2007-12-08T00:54:59+09:00
Subject: Re: help with has_and_belongs_to_many

On Dec 7, 9:45 am, Rick DeNatale <rick.denat...@gmail.com> wrote:
> On 12/7/07, Junkone <junko...@gmail.com> wrote:
>
> > i get error when assigning many to many relationship
> > >> a=Trade.find(1)
> > => #<Trade:0x477f4bc @attributes={"tradestatus"=>"O", "size"=>nil,
> > "mfe"=>nil, "
> > tradestrategy"=>nil, "symbol_alias"=>"PRGX", "tradeinterval"=>"DAILY",
> > "getpictu
> > res"=>nil, "tradename"=>nil, "id"=>"1", "mae"=>nil,
> > "grossrevenue"=>nil, "tradec
> > omments"=>nil, "tradedirection"=>"Short"}>
> > >> z=Tag.find(1)
> > => #<Tag:0x4779044 @attributes={"id"=>"1", "description"=>"exampe1"}>
> > >> a.tags=z
> > NoMethodError: undefined method `each' for #<Tag:0x4779044>
> >         from e:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/
>
> You don't replace a habtm relationship with an assignment, you add to it
>
>     a.tags << z
>
> --
> Rick DeNatale
>
> My blog on Rubyhttp://talklikeaduck.denhaven2.com/

thanks. how do you do the reverse. if i want to remove an existing
relationship.