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by _asummers 3265 days ago
Ecto is hands down the best "ORM" I've used. At no point has it ever gotten in the way of us dynamically creating queries on the fly, just following the Ecto internals (not recommended, but totally doable) and has an extremely expressive syntax. The team behind it has been rolling out new features and are extremely responsive to requests on the mailing list. I encourage you to give it a chance.

The mental shift is that "schemas" are not objects in an ORM sense, but instead are just data, or views over data. The functions come from taking in data or a Changeset and manipulating those, versus calling a function on a class.

As far as errors, Elixir 1.4.5 has much better error messages, specifically printing the args to crashes and such, and OTP 20/ Elixir 1.5 should drastically improve Dialyzer error messages. I am not a Ruby guy, so perhaps you can say what you feel is missing from Elixir's messages and how the Ruby gem improves it. Also you can literally inspect running state on the fly with the BEAM tooling, so the need for things like debuggers goes down.
1 comments
denisw 3265 days ago
Could you explain which changes to Elixir 1.5 and OTP 20 should result in better Dialyzer error messages? I didn't find anything relevant to that in the respective changelogs.

(For context, Dialyzer is a static analysis tool detecting type errors which is part of the core Erlang distribution.)

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_asummers 3264 days ago
It's kind of cryptic, but the Erlang release notes say:

  OTP-14369    Application(s): compiler, dialyzer, stdlib
               Related Id(s): PR-1367

               The format of debug information that is stored in BEAM
               files (when debug_info is used) has been changed. The
               purpose of the change is to better support other
               BEAM-based languages such as Elixir or LFE.

               All tools included in OTP (dialyzer, debugger, cover,
               and so on) will handle both the new format and the
               previous format. Tools that retrieve the debug
               information using beam_lib:chunk(Beam, [abstract_code])
               will continue to work with both the new and old format.
               Tools that call beam_lib:chunk(Beam, ["Abst"]) will not
               work with the new format.

               For more information, see the description of debug_info
               in the documentation for beam_lib and the description
               of the {debug_info,{Backend,Data}} option in the
               documentation for compile.
There aren't specific notes in the Elixir 1.5 release notes, but given that it is OTP20 compatible, I assume it would be able to leverage this, perhaps with some work by Dialyxir.

http://erlang.org/download/otp_src_20.0-rc2.readme

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