tcopeland

module IncDec
  # Mostly copied from RSpec::Matchers::BuiltIn
  class ChangeDetails
    attr_reader :actual_before, :actual_after

    def initialize(matcher_name, receiver=nil, message=nil, &block)
      if receiver && !message
        raise(
          ArgumentError,
          "`#{matcher_name}` requires either an object and message " \

tcopeland

twitter.com##.ActivityItem:-abp-contains(liked a Tweet from)
twitter.com##.ActivityItem:-abp-contains(liked a video from)
twitter.com##.ActivityItem:-abp-contains(liked a photo from)
twitter.com##.ActivityItem:-abp-contains(Retweeted a video from)
twitter.com##.ActivityItem:-abp-contains(Retweeted a photo from)

tcopeland

$ cat db/migrate/* app/models/*.rb
class CreatePosts < ActiveRecord::Migration[5.1]
  def change
    create_table :posts do |t|
      t.string :title

      t.timestamps
    end
  end
end

tcopeland

>> Book.select(:author, :isbn).first
  Book Load (0.4ms)  SELECT  "books"."author", "books"."isbn" FROM "books" ORDER BY "books"."id" ASC LIMIT $1  [["LIMIT", 1]]
=> #<Book id: nil, isbn: "0787967076", author: "Steven B. Sample">
>> Book.select(:id, :author, :isbn).first
  Book Load (0.3ms)  SELECT  "books"."id", "books"."author", "books"."isbn" FROM "books" ORDER BY "books"."id" ASC LIMIT $1  [["LIMIT", 1]]
=> #<Book id: 5, isbn: "0787967076", author: "Steven B. Sample">
>> Book.find(5).update(isbn: nil, author: "heyo")
  Book Load (0.5ms)  SELECT  "books".* FROM "books" WHERE "books"."id" = $1 LIMIT $2  [["id", 5], ["LIMIT", 1]]
   (0.1ms)  BEGIN
  SQL (19.7ms)  UPDATE "books" SET "isbn" = $1, "author" = $2, "escaped_author" = $3, "updated_at" = $4 WHERE "books"."id" = $5  [["isbn", nil], ["author", "heyo"], ["escaped_author", "heyo"], ["updated_at", 2017-12-13 20:40:57 UTC], ["id", 5]]

tcopeland

module MyTweak
  def execute(sql, name=nil)
    if caller.detect {|x| x =~ /20171010151334/ } && sql !~ /SHOW TIME ZONE/
      puts sql
    else
      super
    end
  end
end
class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter

tcopeland

class TravelOption < ApplicationRecord
  has_many :travels
end


class Travel < ApplicationRecord
  belongs_to :travel_option
end

>> TravelOption.joins(:travels).where(location_id: 1).select(:location_id, :price, :tour_id).map(&:tour_id)

tcopeland

module Arel
  module Visitors
    class MyWhereSsqlWithoutSql < Arel::Visitors::ToSql
      def initialize(inner_visitor, *args, &block)
        @inner_visitor = inner_visitor
        super(*args, &block)
      end

      private

tcopeland

a = {zzz: [{b: 1, c: 2}, {b:3, c:4}]}
 
  # slight variant on https://stackoverflow.com/questions/10676608/ruby-deleting-all-instances-of-a-particular-key-from-hash-of-hashes
  class Hash
   def deep_reject_key!(key)
     keys.each {|k| delete(k) if k == key || self[k] == self[key] }

     values.each do |v| 
       v.deep_reject_key!(key) if v.is_a? Hash
       v.each {|i| i.deep_reject_key!(key) if i.is_a? Hash } if v.is_a? Array

tcopeland

Synvert::Rewriter.new 'rails', 'redirect_with_notice' do
  description <<-EOS
  Combines flash setting and redirect to.
  flash[:notice] = "huzzah"
  redirect_to root_path
  =>
  redirect_to root_path, notice: "huzzah"
  EOS
  within_file 'app/controllers/**/*rb' do
    within_node type: 'def' do

tcopeland

irb(main):014:0> puts RUBY_VERSION ; n = 5000 ; Benchmark.bm {|x| x.report { n.times {'  '.strip.empty?} } ; x.report {  n.times { '   ' =~ /^\s*$/ } } }
2.1.5
       user     system      total        real
   0.010000   0.000000   0.010000 (  0.007651)
   0.000000   0.010000   0.010000 (  0.005907)
   
   irb(main):016:0> puts RUBY_VERSION ; n = 5000 ; Benchmark.bm {|x| x.report { n.times {'  '.strip.empty?} } ; x.report {  n.times { '   ' =~ /^\s*$/ } } }
2.2.0
       user     system      total        real
   0.000000   0.000000   0.000000 (  0.001773)