Posts by José Valim

Beyond Functional Programming with Elixir and Erlang

I would like to add a slightly different perspective to functional programming in the Erlang VM: functional programming is not a goal in the Erlang VM. It is a means to an end. When designing the Erlang language and the Erlang VM, Joe, Mike and Robert did not aim to implement a functional programming language, … »

Ecto’s insert_all and schemaless queries

One of the functions added to Ecto 2.0 is Ecto.Repo.insert_all/3. insert_all allows developers to insert multiple entries at once into a repository: MyApp.Repo.insert_all(Post, [[title: “hello”, body: “world”], [title: “another”, body: “post”]]) Although insert_all is just a regular Elixir function, it plays an important role in Ecto 2.0 goals. To understand more about these goals, let’s … »

Ecto 2.0.0-rc is out!

We are really glad to announce the release candidate for Ecto 2.0 has been released. The upcoming Ecto version packs many goodies: We have migrated to DBConnection, which considerably improves the performance of how Ecto manages connections to the database as a whole. Improved pool management, faster encoding/decoding, support for prepared queries and more; The … »

Ecto 2.0.0-beta.0 is out!

Hello everyone, We are really glad to announce that Ecto 2.0.0-beta.0 has been released. The upcoming Ecto version packs many goodies: We have migrated to DBConnection, which considerably improves the performance of how Ecto manages connections to the database as a whole. Improved pool management, faster encoding/decoding, support for prepared queries and more The effective … »

Improve remember me cookie expiration in Devise (CVE-2015-8314)

A security bug (CVE-2015-8314) has been reported in Devise’s remember me system. Devise implements the “Remember me” functionality by using cookies. While this functionality works across multiple devices, Devise ended-up generating the same cookie for all devices. Consequently, if a malicious user was able to steal a remember me cookie, the cookie could be used … »

Comparing Elixir and Erlang variables

Sometimes Erlang programmers are worried “Elixir variables may be the source of hidden bugs”. This article discusses those concerns and shows how variables in Erlang can produce related “hidden bugs”, some of those eliminated by Elixir. Before we start, a short disclaimer: Elixir does not have mutable variables, it has rebinding. Mutability is often associated … »