felipeelias

RSpec.configure do |config|
  config.around do |example|
    # For examples using capybara-webkit for example.
    # Remove this if you don't use it or anything similar
    if example.metadata[:js]
      example.run

      ActiveRecord::Base.connection.execute("TRUNCATE #{ActiveRecord::Base.connection.tables.join(',')} RESTART IDENTITY")
    else
      ActiveRecord::Base.transaction do

ryansobol

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

lukes

namespace :db do

  desc "Outputs any invalid data records"
  task :invalid_records => :environment do
    puts "\n** Testing record validating in #{Rails.env.capitalize} environment**\n"
    ActiveRecord::Base.send(:subclasses).each do |model|
      puts "#{model} records (#{model.count})"
      next if model.count == 0
      invalid = model.all.reject(&:valid?)
      if invalid.size.zero?

chrisl8888

@media (min-width:320px) { /* smartphones, portrait iPhone, portrait 480x320 phones (Android) */ }
@media (min-width:480px) { /* smartphones, Android phones, landscape iPhone */ }
@media (min-width:600px) { /* portrait tablets, portrait iPad, e-readers (Nook/Kindle), landscape 800x480 phones (Android) */ }
@media (min-width:801px) { /* tablet, landscape iPad, lo-res laptops ands desktops */ }
@media (min-width:1025px) { /* big landscape tablets, laptops, and desktops */ }
@media (min-width:1281px) { /* hi-res laptops and desktops */ }

zacksiri

require 'benchmark'

class AgeGroup < Struct.new(:categories)
  # def 
  #   Hash[*AGE_CATEGORIES.keys
  #         .map { |r| r.map { |v| 
  #           [v, AGE_CATEGORIES.select 
  #             { |k, val| 
  #               k.include?(v)
  #             }.values.first]

jjb

This all applies to Ruby 2.1. In some cases a setting is not available in 2.0, this is noted. There is also a different with 1.9, 1.8, and REE --- these are not noted.

All the relevant code is in https://github.com/ruby/ruby/blob/master/gc.c

RUBY_HEAP_MIN_SLOTS

default: 10000

The number of heap slots to start out with. This should be set high enough so that your app has enough or almost enough memory after loading so that it doesn't have to allocate more memory on the first request (althogh this probably isn't such a big deal for most apps).

(todo: figure out how big a slot is. i think the answer can be infered from this code.)

seyhunak

unless Rails.env.production?
  connection = ActiveRecord::Base.connection
  connection.tables.each do |table|
    connection.execute("TRUNCATE #{table}") unless table == "schema_migrations"
  end

  sql = File.read('db/import.sql')
  statements = sql.split(/;$/)
  statements.pop

krasnoukhov

{"address":"0x7f8b8df20628", "type":"STRING", "class":"0x7f8b8a029668", "frozen":true, "embedded":true, "fstring":true, "bytesize":3, "value":"=5F", "encoding":"UTF-8", "flags":{"wb_protected":true, "old":true, "marked":true}}
{"address":"0x7f8b8df20650", "type":"STRING", "class":"0x7f8b8a029668", "frozen":true, "embedded":true, "fstring":true, "bytesize":3, "value":"=3F", "encoding":"UTF-8", "flags":{"wb_protected":true, "old":true, "marked":true}}
{"address":"0x7f8b8df20678", "type":"STRING", "class":"0x7f8b8a029668", "frozen":true, "embedded":true, "fstring":true, "bytesize":3, "value":"=29", "encoding":"UTF-8", "flags":{"wb_protected":true, "old":true, "marked":true}}
{"address":"0x7f8b8df206a0", "type":"STRING", "class":"0x7f8b8a029668", "frozen":true, "embedded":true, "fstring":true, "bytesize":3, "value":"=28", "encoding":"UTF-8", "flags":{"wb_protected":true, "old":true, "marked":true}}
{"address":"0x7f8b8df206c8", "type":"STRING", "class":"0x7f8b8a029668", "frozen":true, "embedded":true, "fstring":tr

chenshaoju

ultrafast superfast veryfast faster fast medium slow slower veryslow placebo
<---fast/poor quality----------------------------------slow/good quality--->

Batch:
for %i in (G:\*.flv) do ffmpeg.exe -threads 4 -i %i -preset placebo -c:v libx264 -qp 25 -pix_fmt yuv420p -c:a libvo_aacenc -ac 2 -ar 22050 -b:a 64k "D:\TempData\3\%~ni.mp4"

JPG2AVI:
ffmpeg.exe -r 5/1 -i "D:\My Documents\Desktop\motion\Image%05d.jpg" -preset placebo -c:v libx264 -qp 1 -pix_fmt yuv420p "D:\My Documents\Desktop\Output_Lossless.mp4"

Sina:

sionc

- Check rails version
$ rails -v

- To update rails
$ gem update rails

- Creating a new rails app using postgresql
$ mkdir rails_projects
$ cd rails_projects
$ rails new myapp --database=postgresql