You're on the right track - the :through part comes in when you want
to go directly from Post to User. The following associations will do
what you're looking for:

- on Post
has_many :alert_users, :through => :alerts, :source => :user

- on User
has_many :alert_posts, :through => :alerts, :source => :post

(you may need some extra :class_name noise, but I think this will
work)

Then, given a post @post, you can get all the users receiving alerts:

@post.alert_users

or all the posts a user @user is being alerted about:

@user.alert_posts

--Matt Jones

On Jun 5, 10:55 am, JL Smith <autige...@gmail.com> wrote:
> Is this thought process on the right path?  Thanks for any help.
>

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