In the Agile Rails book, on page 232 (PDF, 4th edition) there is an
example of (within ActiveRecord) marking an article as read by a user at
the present time. Short example code (from the book) here:
class User < ActiveRecord::Base has_and_belongs_to_many :articles def read_article(article) articles.push_with_attributes(article, :read_at => Time.now) end # ... end
However, it seems this piece of code would only work the first time you
read a specific article. It appears to always create a new join table
post, and not to just update if there is an existing post. How would one
best solve this?