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GeoPlanet data with ancestor chain cache imported in 10 minutes

Yahoo! provides its GeoPlanet data as three separate TSV files, available for download here.

That's a database with some 17 million records:

• 5.7 million records: locations (aka places).
• 2.2 million records: alternative names for each place (aka aliases).
• 9.6 million records: matrix of neighbourhoods per place (aka adjacencies).

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class Api::RegistrationsController < Api::BaseController
  
  respond_to :json
  def create

    user = User.new(params[:user])
    if user.save
      render :json=> user.as_json(:auth_token=>user.authentication_token, :email=>user.email), :status=>201
      return
    else

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require 'spec_helper'

feature "Login" do
  scenario "remembered user" do
    password = "12345678"
    user = create(:user, password: password)
    
    access_protected_page_should_ask_to_login
    current_path.should eq login_path

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My summary of https://www.youtube.com/watch?v=IqrwPVtSHZI

TL;DR:

Rails has a library, ActiveSupport, which adds methods to Ruby core classes. One of those methods is String#blank?, which returns a boolean (sometimes I miss this convention in Rust, the ?) if the whole string is whitespace or not. It looks like this: https://github.com/rails/rails/blob/b3eac823006eb6a346f88793aabef28a6d4f928c/activesupport/lib/active_support/core_ext/object/blank.rb#L99-L117

It's pretty slow. So Discourse (which you may know from {users,internals}.rust-lang.org) uses the fast_blank gem, which provides this method via a C implementation instead. It looks like this: https://github.com/SamSaffron/fast_blank/blob/master/ext/fast_blank/fast_blank.c

For fun, Yehuda tried to re-write fast_blank in Rust. Which looks like this:

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require 'benchmark/ips'

Benchmark.ips do |x|
  x.report(:raise_rescue) do
    begin
      raise ArgumentError
    rescue ArgumentError
    end
  end

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# We noticed that adding `accepts_nested_attributes_for :comments, allow_destroy: true`
# caused extra queries to be run when serializing comments in a post
# and including the post name in each comment resource object (this is JSON API, names changed):
#
#     blog_id = params.permit(:id)[:id]
#     Blog = Blog.where(id: blog_id).includes(posts: [:comments]).first
#     comments = blog.posts.flat_map(&:comments)
#     comment_fields = {comments: [:id, :title, :body, :post], posts: [:name]}
#     comment_includes = [:post]
#

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#<Class:ActionController::Parameters>#always_permitted_parameters=:126 ([[:req, :obj]])
ActionDispatch::Http::ParameterFilter#initialize:6 ([[:opt, :filters]])
ActionDispatch::Http::ParameterFilter#initialize:6 ([[:opt, :filters]])
ActiveSupport::Callbacks::ClassMethods#normalize_callback_params:594 ([[:req, :filters], [:req, :block]])
ActiveSupport::Callbacks::ClassMethods#normalize_callback_params:594 ([[:req, :filters], [:req, :block]])
ActiveSupport::Callbacks::ClassMethods#normalize_callback_params:594 ([[:req, :filters], [:req, :block]])
#<Class:ActiveModelSerializers::SerializableResource>#_render_callbacks=:83 ([[:req, :val]])
ActiveModelSerializers::Logging::ClassMethods#instrument_rendering:18 ([])
ActiveModelSerializers::Callbacks::ClassMethods#around_render:50 ([[:rest, :filters], [:block, :blk]])
ActiveSupport::Callbacks::ClassMethods#normalize_callback_params:594 ([[:req, :filters], [:req, :block]])

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#!/usr/bin/env ruby
# encoding: utf-8

# irb3 - Runs an IRB-esque prompt (but it's NOT really IRB!) over multiple
#        versions of Ruby at once (using RVM)
#        
#        By Peter Cooper, BSD licensed
#
#        Main dependency is term-ansicolor for each impl:
#          rvm exec gem install term-ansicolor

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#/usr/bin/env bash
json_url() {
  local base="https://m.guidebook.com/api/v1/public_event/?guide__id=64858&limit=0&start_time__year=2016&start_time__month=5"
  local day="$1"
  local url="${base}&start_time__day=${day}"
  echo -e "$url"
  $url
}
for day in 4 5 6; do
  curl -XGET $(eval "json_url $day") -o "may_${day}.json"

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diff --git a/Gemfile b/Gemfile
index f34a069..cb26600 100644
--- a/Gemfile
+++ b/Gemfile
@@ -100,6 +100,8 @@ group :test do
   gem 'rspec', '~> 3.3'
   gem 'rspec_junit_formatter', '~> 0.2' # per https://circleci.com/docs/test-metadata#automatic-test-metadata-collection
   gem 'rspec-rails', group: :development
+  gem 'autodoc', require: false
+  gem 'redcarpet', require: false