Congrats to the whole team!
It's also worth noting that Ecto [1], the core-maintained Elixir ORM-like package, also hit v1 earlier this week and has backends for dealing with: PostgreSQL, MySQL, MSSQL, SQLite3 & MongoDB.
It's also worth noting that Ecto [1], the core-maintained Elixir ORM-like package, also hit v1 earlier this week and has backends for dealing with: PostgreSQL, MySQL, MSSQL, SQLite3 & MongoDB.
As someone who has used lots of ORMs I find the switch to a libary like Ecto very refreshing. It has an intuitive and very composable querying API and friendly DSLs for defining schemas and validations. These are the baseline features of any database/modeling library and Ecto satisfies them nicely.
But by far my favorite feature that has come in handy is that Ecto's concept of Repos does not couple you to a specific database. Unlike traditional ORMs that couple your objects to a specific database (read: the my_cool_app database in MySQL or Postgres) it's easy to support different databases within the same type of RDBMS or different RDBMS entirely. Since all querying in Ecto goes through Repo modules all you need to do is just create more Repo modules and configure them accordingly.
For some people this feature might not sound useful but if you've ever worked on an Enterprise or older app with multiple data sources or want to switch from MySQL to Postgres, this is a killer feature. Doing this with Rails' ActiveRecord is ugly, buggy, a pain and will bring you to your knees during Rails upgrades any time there are major changes in ActiveRecord.
Very exciting that they are branching out to support MongoDB as well. I'd love if they could support more untraditional Postgres operators for arrays and json (I guess there's always a tension between least common denominator and using the specialized features of each DB). You can get around it with partials, but it makes the code more messy.
Unfortunately, I don't have experience with using the ORMs you listed in anger so I can't make a direct comparison. Anecdotally, I have found it much nicer to use than Django's.