ernie

def initialize(base_or_relation, opts = {})
  @relation = base_or_relation.scoped
  @base = @relation.klass
  @search_key = opts[:search_key] ? opts[:search_key].to_s : 'search'
  @join_dependency = build_join_dependency
  @search_attributes = {}
  @errors = ActiveModel::Errors.new(self)

  singleton_class.instance_eval "def base; #{@base} end"
end

ernie

# Can this be done with strings? Sure. This feels much nicer to me, though.
class Verb < ActiveRecord::Base
  belongs_to :verbable, :polymorphic => true
  belongs_to :objectifiable, :polymorphic => true

  scope :of_interest_to_user, lambda {|u|
    where(
      (:objectifiable_type.eq % 'User' & :objectifiable_id.eq % u.id) |
      (:objectifiable_type.eq % 'Book' & :objectifiable_id.in % u.book_ids)
    )

ernie

From 1be13d1c88ca518996135e89454c17691afbcc51 Mon Sep 17 00:00:00 2001
From: Ernie Miller <ernie@metautonomo.us>
Date: Thu, 6 Jan 2011 20:06:29 -0500
Subject: [PATCH] Fix polymorphic belongs_to associationproxy raising errors when loading target.

---
 .../belongs_to_polymorphic_association.rb          |    5 +++++
 .../associations/belongs_to_associations_test.rb   |    9 +++++++++
 activerecord/test/models/sponsor.rb                |    2 ++
 3 files changed, 16 insertions(+), 0 deletions(-)

ernie

From 61ad8e150d74f6c2bafeaac73f1b40d11d3092c1 Mon Sep 17 00:00:00 2001
From: Ernie Miller <ernie@metautonomo.us>
Date: Thu, 6 Jan 2011 17:13:01 -0500
Subject: [PATCH] Fix polymorphic belongs_to associationproxy raising errors when loading target.

---
 .../belongs_to_polymorphic_association.rb          |    4 ++++
 .../associations/belongs_to_associations_test.rb   |    9 +++++++++
 activerecord/test/models/sponsor.rb                |    2 ++
 3 files changed, 15 insertions(+), 0 deletions(-)

ernie

namespace :javascripts do
  desc 'minify the javascript files residing in app/javascripts to public/javascripts'
  task :minify do
    RakeFileUtils.verbose false do
      Dir["app/javascripts/*.js"].each do |filename|
        outfile = filename.sub(/^app/, 'public').sub(/\.js$/, '.min.js')
        puts "#{filename} -> #{outfile}"
        sh(
          'java',
          '-jar',

ernie

Article.joins{person.comments}.where{person.comments.body =~ '%hello%'}.to_sql
# => "SELECT \"articles\".* FROM \"articles\" INNER JOIN \"people\" ON \"people\".\"id\" = \"articles\".\"person_id\" INNER JOIN \"comments\" ON \"comments\".\"person_id\" = \"people\".\"id\" WHERE \"comments\".\"body\" LIKE '%hello%'"

Person.where{(id + 1) == 2}.first
# => #<Person id: 1, parent_id: nil, name: "Aric Smith", salary: 31000>

Person.where{(salary - 40000) < 0}.to_sql
# => "SELECT \"people\".* FROM \"people\"  WHERE \"people\".\"salary\" - 40000 < 0"

p = Person.select{[id, name, salary, (salary + 1000).as('salary_after_increase')]}.first

ernie

# These are nothing fancy. Stick them in your .profile for quick access.

# Tail the log of a pow application
function powl {
  tail -f ~/.pow/"$1"/log/development.log
}

# Restart a pow application
function powr {
  touch ~/.pow/"$1"/tmp/restart.txt

ernie

require 'benchmark'
$LOAD_PATH << './lib'
require 'arel'

def grouping_any(range)
  literal = Arel.sql('1')
  literal.eq_any(range.to_a)
end

def grouping_all(range)

ernie

# So, a SELECT DISTINCT on some DBs requires that all order values are in the select clause.
# I'm hoping there's a better cross-platform way of doing this without branching, and I
# kind of think I must be overlooking something that's already built-in.
# Open to suggestions!
def distinct_relation(relation)
  offset, limit = relation.offset_value, relation.limit_value
  klass.select('DISTINCT subquery.*').
        from(Arel::Nodes::As.new(
          Arel::Nodes::Grouping.new(relation.except(:offset, :limit).arel.ast),
          Arel.sql('subquery')

ernie

require 'benchmark'

haystack = (1..1_000_000).to_a
needles = 1.upto(100).map {|n| n * 10_000}

module EachDetector
  def self.find(haystack, needle)
    haystack.each do |v|
      return true if v == needle
    end