LearnWhat is a has_many :through association in Ruby on Rails? | Quick Tip

Jason Seifer
writes on May 9, 2013

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In this Treehouse Quick Tip, Jason demystifies the concepts behind what a has many :through association is in Ruby on Rails. We’ll figure out what a join table is, how different models fit together, and the syntax needed to make it all work. Score one for Treehouse!

4 Responses to “What is a has_many :through association in Ruby on Rails? | Quick Tip”

  1. water test kit on May 10, 2013 at 12:32 am said:

    Thanks for sharing some quick tips.

  2. Thanks for your great stuff!!

  3. So, do you have any advice for OO actions that work on data stored on the join table? For instance, if you added a field to Subscriptions called “expired” for folks that quit paying their subscription fee, how would you access and/or update the “expired” field?

    Obviously, you can pull the subscription through a call like *sub = Subscription.where(user: user, magazine: magazine)*, but i didn’t know if working directly on the Subscription model is considered the Rails Way of working CRUD on join tables.

  4. This was a great tip but it would be nice to see how to use it with nested attributes in a form and also how to set the strong parameters for it in rails 4.

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