creaturenex

How We Deployed Image Processing to Heroku in Support of a Rails 6 Application

Our app was already deployed and working on Heroku with MiniMagick. There were a few features of Image Processing that were appealing, performance and autorotation, and it appeared to be a straightforward swap.

Locally, we had run brew install vips on our MacBooks to get it running. That was early in the process and a detail long forgotten. When I deployed to Heroku @juliancheal pointed out that the staging environment was failing with an ActiveSupport::MessageVerifier::InvalidSignature error.

We were able to quickly identify the missing libvips dependency.

Figuring out how to install libvips to support rubyvips to support Image Processing was not trivial and therefore this guidepost exists.

creaturenex

def solution(number)
  case
  when number % 5 == 0 && number % 3 == 0 then "FizzBuzz"
  when number % 5 == 0 then "Buzz"
  when number % 3 == 0 then "Fizz"
  else
    number
  end
end

creaturenex

// The following data should be run in the console while viewing the page https://read.amazon.com/
// It will export a CSV file called "download" which can (and should) be renamed with a .csv extension

var db = openDatabase('K4W', '3', 'thedatabase', 1024 * 1024);

getAmazonCsv = function() {
  // Set header for CSV export line - change this if you change the fields used
  var csvData = "ASIN,Title,Authors,PurchaseDate\n";

  db.transaction(function(tx) {

creaturenex

You have an application that uses a #fetch method to retrieve a collection of data from some external source and a #save method that saves any modified data when you finish. To make updates easier, you have several methods that update the data based on different search criteria. So far, you have something like this:

Copy Code
def update_data(select_string, block)
  data = fetch(select_string)
  data.each # you can update or replace this line
  save(data)
end

def update_by_type(type) # you can update this method

creaturenex

class Invader
  def initialize
    self.animate
  end

  def down
    puts "      ▒▒          ▒▒"
    puts "        ▒▒      ▒▒"
    puts "      ▒▒▒▒▒▒▒▒▒▒▒▒▒▒"
    puts "    ▒▒▒▒  ▒▒▒▒▒▒  ▒▒▒▒"