I'm building a blog application that allows users to create and edit
blog posts.  I want to add the ability for a user to check a box on
the post page that enables an alert on the post that sends an email to
the user when the post is updated.

I would think my alerts table would simply consist of a user_id, a
post_id and a created_at timestamp.  So in modeling the associations
for this, my first thought was that this would be a has_many :through
association but I'm not sure how or where I would make that
association.

Is this thought process on the right path?  Thanks for any help.

class Post < ActiveRecord::Base
  belongs_to :creator, :class_name => "User", :foreign_key =>
"created_by"
  has_many :alerts, :dependent => :destroy
end

class User < ActiveRecord::Base
  has_many :created_posts, :class_name => "Post", :foreign_key =>
"created_by"
  has_many :alerts, :dependent => :destroy
end

class Alert < ActiveRecord::Base
  belongs_to :post
  belongs_to :user
end
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