razorcd

<!--
    HTML5 data- attributes using RESTful approach
    HTML5 specifies extensible attributes like data-foo=“bar” (or as in Twitter Bootstrap data-toggle=“modal”), which poses two problems for Rails.
    
    First, if you’re using symbol notation in link_to (for instance) to specify attributes, this fails (dash is not a valid symbol character), so:
-->
    <% link_to('Edit', '../main.html', :class => "btn", :data-toggle => "modal") %> <!-- INVALID!! -->

<!--
    There are two solutions:

razorcd

bm = ->(counter=1) {
  Benchmark.measure do
    counter.times do |i|
      Sponsorship.joins(:sponsor, :orphan).
                  where("sponsor_id = ?",1).
                  select("orphans.name as orphans_name, orphans.date_of_birth as orphans_date_of_birth, orphans.gender as orphans_gender").
                  to_a
      # puts i
    end
  end

razorcd

#app/models/validators/valid_date_presence_validator.rb
 class ValidDatePresenceValidator < ActiveModel::EachValidator
  include DateHelpers

  def validate_each(record, attribute, value)
    unless valid_date? value
      record.errors[attribute] << ('is not a valid date')
    end
  end

razorcd

#spec/support/model_helpers.rb
# use like this:
# it { is_expected.to have_validation ValidDatePresenceValidator,
#                                     :on => :start_date,
#                                     :options => [:allow_blank, :allow_nil]
#                                     }
RSpec::Matchers.define :have_validation do |validator, params|
  match do |model|
    my_validators = model.class.validators.select { |v| v.class == validator and v.attributes.include? params[:on] }
    my_validators = validators.select { |v| params[:options].all? { |po| v.options.any? { |vo| vo == po } } } if params[:options]

razorcd

pg_restore -vwc -U postgres -d database_name file.dump

razorcd

# Class Specialisations  (Composition + Dependency injection)

class House
  DATA = [1,2,3,4,5,6]
  attr_reader :data

  def initialize(orderer: DefaultOrderer.new, formatter: DefaultFormatter.new)
    # @data = formatter.format(orderer.order(DATA))
    formatted_data = formatter.format(DATA)
    @data = orderer.order(formatted_data)

razorcd

Check free mem:
free -m

Add swap:
```
  sudo dd if=/dev/zero of=/swap bs=1M count=1024
  sudo mkswap /swap
  sudo swapon /swap
```

razorcd

//simple

var var1 = 1;
var func1 = function(input) {
	//var var2 = 2;
	return input + var1; // + var2;
}

console.log(func1(1));
console.dir(func1);

razorcd

1. Codebase
One codebase tracked in revision control, many deploys

2. Dependencies
Explicitly declare and isolate dependencies

3. Config
Store config in the environment

4. Backing services

razorcd

exec("echo 'hello world'") # exits from ruby, then runs the command
system('echo', 'hello world') # returns the status code
sh('echo', 'hello world') # returns the status code
`echo "hello world"` # returns stdout
%x[echo 'hello world'] # returns stdout