maicher

- grafika
- - konwertowanie obrazków pomiędzy formatami
- - rodzaje kompresji, formaty obrazów i ich cechy (np że png waży więcej od jpg i dlaczego)  
- - popularne filtry
- - cięcie layoutu - co to znaczy, jak się to robi
- - czym się różni grafika wektorowa od rastrowej
- - przeźroczyste tło w obrazkach (wady, zalety)
- opensource i free software
- - co to znaczy? na czym polega?
- - popularne projekty opensource

maicher

u = User.new(params)
if u.save
  # redirect
else
  # render form with errors
end


# task: Dodać sprawdzanie czy user jest fraudem.

maicher

def new
  # initialize a hash from 
  @inputs = Form.new( 
    user_name: '',
    some_field: some_object.default_some_field,
    something: {
      a: '',
      b: 'some default value'
    }
  )

maicher

def new
  # initialize a hash from 
  @inputs = { 
    user_name: '',
    some_field: some_object.default_some_field,
    something: {
      a: '',
      b: 'some default value'
    }
  }

maicher

class CreateUser
  class Error < StandardError; end
  
  # ...
end

# contoller
begin
  user = CreateUser.new(params).call
  p "User #{user.username} created succesfully"

maicher

class A
  def call
    # do something
  end
end

class B
  def call(argument)
    # do something different
  end

maicher

Caching in OfferProvider

• Why? - To improve performance (that is not call db an each provider request).
• Where? - At the point of fething data from OfferProvider component (repositories).
• How? - By using Rails.cache#fetch

Introduction

Why we don't like caching?

maicher

# Managing own fork

### Configure upstream
git remote -v
git remote add upstream git@github.com:wimdu/wimdu.git

### Syncing to upstream
git checkout master
git fetch upstream master
git reset --hard upstream/master

maicher

def print_translations(hash, phrase_key, i = 0)
  hash.each do |k, v|
    if v.is_a?(Hash)
      i.times { print '  ' }
      print "#{k.to_s.camelize(:lower)}: {\n";
      print_translations(v, "#{phrase_key}.#{k}", i + 1)
      i.times { print '  ' } 
      print "},\n"
    else i.times { print '  ' }
      print "#{k.to_s.camelize(:lower)}: t('#{phrase_key}.#{k}'),\n"

maicher

module Container
  # Initialized once (kind'a singleton)
  def self.a
    @a ||= Object.new
  end
  
  # Initialized every time.
  def self.b
    Object.new
  end