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How I cut the time it takes to build an Erlang docker image in half. While adding support for a rebar3 option to only build dependencies and not project applications, rebar3 compile --deps_only, I realized it might already actually work for the Docker use case I had in mind. So I gave it a try and, yup, turns out it does! The idea is to cache a docker layer of the built dependencies to reuse if they haven’t changed. ...

In my last post I showed the Webmachine backend to James Yu’s CloudEdit app in Backbone.js. What was left out was, where are the documents stored? Here I’ll show how this is done with CouchDB. And you can give the app a try at http://erlware.org:8080 First, a new Erlang app is needed that we’ll call ece_db. Three modules are implemented, one that starts the app by calling the supervisor’s start function, the supervisor itself that sets up a simple_one_for_one and the gen_server that handles the frontends requests for creating and modifying documents in CouchDB. ...

Working with Erlang for writing RESTful interfaces JSON is the communication “language” of choice. For simplifying the process of JSON to a model the backend could work with efficiently I’ve created maru_models. This app decodes the JSON with jiffy and uses functions generated by a modified version of Ulf’s exprecs to create an Erlang record. The generated functions are created with type information from the record definition and when a property is set for the record through these functions it is first passed to the convert function of maru_model_types to do any necessary processing. ...