mrbrdo

Artist.select(:id, :name).naked.all
# => [{:id=>1, :name=>"mrbrdo"}]

mrbrdo

artists = Artist.eager(songs: ->(q) { q.where{year > 1990} }).all

# example to illustrate the results
artists.each do |artist|
  puts "Artist: #{artist.name}"
  puts "Songs since 1990: " + artist.songs.map(&:title).join(", ")
end

mrbrdo

def x: Int = { println("x()"); 1 }

def a(byName1: => Int, byName2: => Int): Unit = {
      println("a()")
      println(byName1 + byName2)
}

a(x * 2, x * 3)

// output (note when x is actually called):

mrbrdo

# /config/application.rb
config.middleware.insert_before ActionDispatch::ParamsParser, "SelectiveStack"

# /config/initializers/omniauth.rb
::OmniAuthConfig = Proc.new do
  provider :github, # ...
end

# /app/middleware
class SelectiveStack

mrbrdo

BlogsDatasource.new(Blog.all)
.select(:id, posts: { scope: Post.all, select: [:id, :author_name] }).results
# (0.1ms)  SELECT blogs.id FROM "blogs"
# (0.2ms)  SELECT posts.id, posts.blog_id, (posts.author_first_name || ' ' || posts.author_last_name) as author_name FROM "posts"  WHERE (posts.blog_id IN (1))

PostsDatasource.new(Post.all)
.select(:id, :title, :author, :author_name).results
# (0.1ms)  SELECT posts.id, posts.title, posts.author_first_name, posts.author_last_name, (posts.author_first_name || ' ' || posts.author_last_name) as author_name FROM "posts"

mrbrdo

➜  ams_vs_jbuilder git:(master) ✗ rake benchmarks:single_object_with_render
Calculating -------------------------------------
            jbuilder        12 i/100ms
active_model_serializers
                            50 i/100ms
     thin_serializer        53 i/100ms
-------------------------------------------------
            jbuilder      132.1 (±6.8%) i/s -        660 in   5.028041s
active_model_serializers
                          524.8 (±13.7%) i/s -       2600 in   5.088049s

mrbrdo

class Object
  def test1 # instance method!
  end
end

Object.test1 # OK

class SomeClass
  def test2
  end

mrbrdo

struct mrb_jmpbuf buf;

MRB_TRY(&buf) {
  mrb->jmp = &buf;
}
MRB_CATCH(&buf) {
  // handle error
}
MRB_END_EXC(&buf);

mrbrdo

      struct mrb_jmpbuf buf;
      int stoff = mrb->c->stack - mrb->c->stbase;
      int cioff = mrb->c->ci - mrb->c->cibase;

      MRB_TRY(&buf) {
        mrb->jmp = &buf;
      }
      MRB_CATCH(&buf) {
        // if rescued from method that was called from this method
        // and didn't have its own rescue

mrbrdo

$ gem list | grep sequel
sequel (4.10.0)

$ irb
jruby-1.7.12 :001 > require 'sequel'
 => true
jruby-1.7.12 :002 > Sequel.connect("jdbc:postgresql://localhost/mydb")
 => #<Sequel::JDBC::Database: "jdbc:postgresql://localhost/mydb">
jruby-1.7.12 :003 > class ContentMetric < Sequel::Model
jruby-1.7.12 :004?>   end