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# tenho a seguinte situação:

def update 
  ids = params["_json"].map { |hash| hash["id"] }  # --> return [10, 20, 30, 40, 50] 
  positions = params["_json"].map { |hash| hash["position"] } # --> return [0, 1, 2, 3, 4] 
  
  query = MyQueryQuery.new
  query.visible = true
  query.active = true
  

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{
  "public": [
    {
      "thumb": "/uploads/user/avatar/thumb_6fd0915dcee8eb1a04bb215f68ecfa5a.png",
      "name": "Lucky Luciano",
      "email": "lif****@xample.com"
    }
  ],
  "privates": [
    {

sergiomaia

require 'rspec'

string_collection = [
  "Web IconHTML & CSS100%",
  "Command LineLearn the Command Line100%",
  "Ruby IconRuby50%",
  "Rails IconLearn Ruby on Rails100%",
  "Git IconLearn Git100%",
  "SassLearn Sass20%",
  "JQuery IconjQuery1%",

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def find_index(values, target)
  values.each_with_index do |value, i|
    return i if value == target
  end
end

find_index([2, 4, 6, 8, 10, 12], 6)
# => 2

sergiomaia

<iframe width="700px" height="425px" src="http://online.fliphtml5.com/cgpf/jhut/#p=1" frameborder="0" allowfullscreen allowtransparency></iframe>

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# app/forms/registration.rb
class Registration
  include ActiveModel::Model

  attr_accessor(
    :company_name,
    :email,
    :first_name,
    :last_name,
    :terms_of_service

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# app/controllers/registration_controller.rb
class RegistrationsController < ApplicationController
  respond_to :html

  def new
    @registration = Registration.new
  end

  def create
    @registration = Registration.new(registration_params)

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# config/routes.rb
resources :resgistration, only: [:new, :create]

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1.upto(100) do |i|
	if i % 3 == 0 && i % 5 == 0
		puts "FizzBuzz"
	elsif i % 3 == 0
		puts "Fizz"
	elsif i % 5 == 0
		puts "Buzz"
	else
		puts i
	end

sergiomaia

# para esse exemplo pressupõe-se que você tenha um recurso post com o campo >> content:string

#Primeiro criamos um model Tag
rails g model Tag name:string

# >> crie uma tabela CreatePostsTags com post_id e tag_id (para nosso relacionamento has_and_belongs_to_many)
rails g migration CreatePostsTags post:references tag:references

# >> modifique a migration CreatePostsTags add :id => false, já que não precisaremos de id nesta tabela
class CreatePostsTags < ActiveRecord::Migration[5.0]