Associations in models - am I doing it wrong?

[Dan Brooking]

One of my modesl looks like this:

class UnprocessedPage < ActiveRecord::Base

     has_one :user

     attr_accessible :url, :user_id

end

Do I need :user_id?  Or is it implied via "has_one :user"?

This is working as is.. but when I look for examples of other things, I never see any attributes with *_id... so I'm wondering if it's implied and I'm just mucking things up?

[Colin Law]

On 9 December 2012 20:25, Dan Brooking <dmbro...@gmail.com> wrote:
> One of my modesl looks like this:
>
> class UnprocessedPage < ActiveRecord::Base
> has_one :user
> attr_accessible :url, :user_id
> end
>
> Do I need :user_id? Or is it implied via "has_one :user"?

You should not have a user_id column in the database for a has_one
association. If UnprocessedPage has_one :user then User belongs_to
:unprocessed_page and User should have an unprocessed_page_id column.
Are you sure you do not mean User has_many :unprocessed_pages and
UnprocessedPage belongs_to :user?

Have a look at the Rails Guide on ActiveRecord Associations for more
details and if you have not already done so then work right through a
good rails tutorial such as railstutorial.org, which is free to use
online, in order to get the basics of Rails.

Colin

[Dan Brooking]

OK, yeah you are right.  It shouldn't be has_one. It sounds like the associated you mentioned is the one I'm looking for.  With that said, would I still have a user_id column? or would that be implicit via the belongs_to?

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[Colin Law]

On 9 December 2012 22:22, Dan Brooking <dmbro...@gmail.com> wrote:
> OK, yeah you are right. It shouldn't be has_one. It sounds like the
> associated you mentioned is the one I'm looking for. With that said, would
> I still have a user_id column? or would that be implicit via the belongs_to?

Using belongs_to implies that you must provide a user_id column in the
database. As I said, work through the tutorial and study the guides
and all will become clear (well, less muddy at least).

Colin