jeremy

-- C level backtrace information -------------------------------------------
/opt/ruby2.5.1/bin/../lib/libruby.so.2.5(rb_vm_bugreport+0x974) [0x7f6e7aad0904]
/opt/ruby2.5.1/bin/../lib/libruby.so.2.5(0xaaec4) [0x7f6e7a941ec4]
/opt/ruby2.5.1/bin/../lib/libruby.so.2.5(0x1a89c2) [0x7f6e7aa3f9c2]
/lib/x86_64-linux-gnu/libc.so.6(0x7f6e7a4e4f20) [0x7f6e7a4e4f20]
/lib/x86_64-linux-gnu/libc.so.6(__strlen_avx2+0x11) [0x7f6e7a6345a1] ../sysdeps/x86_64/multiarch/strlen-avx2.S:59
/opt/ruby2.5.1/bin/../lib/libruby.so.2.5(rb_str_new_cstr+0xe) [0x7f6e7aa5712e]
/u/apps/bc3/shared/bundle-ruby221/ruby/2.5.0/gems/bcrypt-3.1.13/lib/bcrypt_ext.so(bc_salt+0x6a) [0x7f6e6ad2b04a]

jeremy

def foo
  e = RuntimeError.new
  def e.backtrace() %w[ lol rofl ] end
  raise e
rescue => e 
  raise e
end

foo

jeremy

Keybase proof

I hereby claim:

• I am jeremy on github.
• I am bitsweat (https://keybase.io/bitsweat) on keybase.
• I have a public key ASAHmrs7GVnFuLVA6XK5t2znEMLHrRiixbMEQsbT2wB0dwo

To claim this, I am signing this object:

jeremy

require 'active_support/concern'

module Touchless
  module TouchLater
    extend ActiveSupport::Concern

    included do
      # Preserve immediate touch behavior as touch_now
      alias_method :touch, :touch_now
      alias_method :touch_later, :touch

jeremy

# CI runs tests in order so it gets nice diffable output.
if ENV['CI']
  # Minitest always forces test suites to shuffle. Hack it.
  class Minitest::Runnable
    class NonShufflingArray < Array
      def shuffle
        self
      end
    end

jeremy

require 'active_record'
ActiveRecord::Base.logger = Logger.new($stdout)

ActiveRecord::Base.establish_connection adapter: 'mysql2', database: 'activerecord_unittest'

ActiveRecord::Base.connection.instance_eval do
  create_table(:taggings, :force => true) do |t|
    t.belongs_to :taggable, polymorphic: true
    t.belongs_to :tag
  end

jeremy

Declared ETags, together with Russian Doll caching, can be used to automatically mix your template and asset versions into the ETags set in your controllers. This avoids the need to blow all browser caches on each deploy and neatly contains the scope of "freshness fallout" when you tweak a view.

To include the template's version in the ETag:

  # Incorporate the cache version for this action into our ETag.
  # This allows template changes to bubble up into HTTP cache
  # freshness and bust browser caches when we make changes.
  etag do
    begin

jeremy

diff --git a/railties/lib/rails/console/helpers.rb b/railties/lib/rails/console/helpers.rb
index 230d3d9..1bbdfd2 100644
--- a/railties/lib/rails/console/helpers.rb
+++ b/railties/lib/rails/console/helpers.rb
@@ -7,5 +7,16 @@ module Rails
     def controller
       @controller ||= ApplicationController.new
     end
+
+    def rake(task)

jeremy

We've seen lots of Ruby feature requests about converting an Enumerable to a Hash: to_h, map_hash, map_to, each_with_hash, etc. Let's look at one common, simple case of this.

Building a key/value mapping from a collection of keys is awkward. We commonly see Hash[*collection.map { |element| [element, calculate(element)] }] or collection.each_with_object({}) { |element, hash| hash[element] = calculate(element) }. Both are verbose. They require boilerplate code that's not relevant to the programmer's intent: to associate an enumerable of keys with calculated values.

Ruby has the idea of an association already: a key and value paired together. It's used by Array#assoc to look up a value from a list of pairs and by Hash#assoc to return a key/value pair. Building up a mapping of key/value pairs is associating keys with values.

So! Consider Enumerable#associate which builds a mapping by associating keys with values:

# Associate filenames with URLs. Before:

jeremy

commit 63a12f72df1a7507f7a1923bdaa56b56b876b562
Author: Jeremy Kemper <jeremy@bitsweat.net>
Date:   Fri Sep 14 17:00:46 2012 -0700

    Pass an exception_handler to queue consumers. Don't run jobs in synchronous & test queues; delegate to a consumer.

diff --git a/activesupport/lib/active_support/queueing.rb b/activesupport/lib/active_support/queueing.rb
index f397e1c..c4ff8b8 100644
--- a/activesupport/lib/active_support/queueing.rb
+++ b/activesupport/lib/active_support/queueing.rb