Example: an owner has many cats.
In your Cat model, add the line:
belongs_to :owner
in your Owner model, add the line:
has_many :cats
You then need to run a migration on your cats table, to add the foreign key
for owners, so Rails can build the associations. From the command line:
rails g migration add_owner_id_to_cats owner_id:integer
This should create a migration file (in the /db folder), with something
like the following in it:
class AddFooToPosts < ActiveRecord::Migration
def change
add_column :cats, :owner_id, :integer # ie, table, field name, field
type
end
end
then, run your migration.
rake db:migrate
Thanks to the convention over configuration approach, rails will
automagically work out that owner_id is a foreign key to the owners table.
from there, you'll be able to access cats through owners, and owners
through cats:
mog.owner # "Steve"
steve.cats.first # "Mog"
That, of course, is just the tip of the iceberg - you can define all kinds
of odd relations, and customise them as much as you want.
JT
On Mon, Feb 10, 2014 at 8:28 PM, Colin Law <[email protected]> wrote:
> On 10 February 2014 16:50, Ken D'Ambrosio <[email protected]>
> wrote:
> > Hey! I'm decent at Ruby, but pretty darn new to Rails. Working through
> > some tutorial stuff, and don't fully understand what direction to take.
> I
> > want to create a one-to-many association; how do I accomplish this?
>
> Work right through a good tutorial such as railstutorial.org (free to
> use online) and all the basics (including associations) will become
> clear.
>
> Colin
>
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