Many to many relationships with Ecto

Nuno Marinho
Feb 12, 2019 · 3 min read
Image for post
Image for post
Elixir with Ecto
Image for post
Image for post
Database with many_to_many table — user_project

Warning: When you use many_to_many and put_assoc/4 you should be aware of the preloads, you need to ensure that the many_to_many relationship data is loaded so that it is updated. And don’t forget to use the on_replace option when declaring the relationship on your model. It took me a while to figure out why the relationship was not being updated, kudos for David Magalhães for the help.


Thoughts, dreams and rants about technology and work life…

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch

Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore

Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store