Support JRuby

[dblock]

Was looking at https://github.com/LTe/grape-rabl/pull/22 which is failing on JRuby. Rabl doesn't support JRuby, oj and msgpack both fail to install, to start.

[fred]

rabl does work on Jruby, only the OJ gem is MRI only, it uses native C extensions.

in Jruby and mongoid without OJ gem, we get

{"id"=>{"$oid"=>"53a1506ff12a9c47ba000e29"}}

instead of

{"id"=>"53a1506ff12a9c47ba000e29"}

we can also use this in the rabl files, but it's kind of a pain in the ass to do it.

node(:id) {|obj| obj.id.to_s }

[dblock]

This has been discussed in https://groups.google.com/forum/#!msg/mongoid/MaXFVw7D_4s/T3sl6Flg428J.

Monkey patch:

module BSON
  class ObjectId
    def as_json(options = {})
      to_s
    end

    def to_bson_key(encoded = ''.force_encoding(BINARY))
      to_s.to_bson_key(encoded)
    end
  end
end

[dblock]

@fred How does Rabl work on JRuby though? Check out git@github.com:LTe/grape-rabl.git and run tests on JRuby. You will get the failure above. Maybe I am missing something?

[toshe]

This is killing us. @dblock , take a look at #471 I don't even know where to start.

[dblock]

Confirmed JRuby bug, https://github.com/jruby/jruby/issues/3009#issuecomment-108091994, made some progress to setting up JRuby tests for Rabl for when that's fixed (or trying to find a workaround), https://github.com/dblock/rabl/tree/jruby, but I ran into #632.