sashadev-sky

```
var jqry = document.createElement('script');
jqry.src = "https://code.jquery.com/jquery-3.3.1.min.js";
document.getElementsByTagName('head')[0].appendChild(jqry);
```

Now `$` and all the other good stuff will be available

sashadev-sky

```
require 'csv'

file = "#{Rails.root}/public/user_data.csv"

products = Product.order(:first_name)

headers = ["Product ID", "Name", "Price", "Description"]

CSV.open(file, 'w', write_headers: true, headers: headers) do |writer|

sashadev-sky

  **Error:**
  
  3.1) Failure/Error: @service = @fastly.create_service(:name => name)
          
          Fastly::Error:
            {"msg":"Bad request","detail":"Exceeding max_total_services: 10"}
            
 **Solution**
 ```
 $ rails c

sashadev-sky

FILE SPACING:

 # double space a file
 sed G

 # double space a file which already has blank lines in it. Output file
 # should contain no more than one blank line between lines of text.
 sed '/^$/d;G'

sashadev-sky

brew cask install virtualbox
brew install docker docker-machine

# create the vm
docker-machine create -d virtualbox dev

# If seeing:
#     (dev) No default Boot2Docker ISO found locally, downloading the latest release...
#     Error with pre-create check: "failure getting a version tag from the Github API response (are you getting rate limited by Github?)"
# then:

sashadev-sky

Using gem aws-sdk for a ror application for uploading images to s3
Uploading images to a fixed bucket with different folders for each object or application.
The s3 keeps a limitation on the number of buckets creattion whereas there is no
limitation for content inside a bucket.

This code will upload image for a user to s3 using aws-sdk gem. The bucket and the image uploaded are made public 
so that the images uploaded are directly accessible. The input it takes is the image complete path 
where it is present, folder in which it should be uploaded and user_id for whom it should 
be uploaded.

sashadev-sky

use Enumerable#lazy method: avoid endless loop and get just the values u need

range = 1..Float::INFINITY
p range.lazy.collect { |x| x * x }.first(10) 	

#=> [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

sashadev-sky

// Specifically, as data url

var saveBlobAsFile = function(fileName, fileContents) {
  if (typeof(Blob) != 'undefined') { // using Blob
    var textFileAsBlob = new Blob([fileContents], {
      type: 'text/plain'
    });
    var downloadLink = document.createElement("a");
    downloadLink.download = fileName;
    if (window.webkitURL != null) {

sashadev-sky

#!/usr/bin/env ruby

# Convert command line
#
#gm convert -font helvetica -fill white -pointsize 20 -draw "text 500,600 'WALLPAPERZ ARE GOOD'" test.jpg output.jpg
#
#convert -background transparent -fill white -gravity center -size 1024x200 -font Helvetica -pointsize 20 #caption:"I'm a wallpaper, you know what to do" test.jpg +swap -gravity south -composite output.jpg
#
# Mogrify command line
#

sashadev-sky

# Note: as you will come to see from looking at these notes, you can only use these properties correctly BEFORE SAVE

# If you want to keep track of changes in your model Rails provides "Dirty Objects". E.g. Your model has a 'name' attribute:

my_model = MyModel.last
my_model.changed?  # it returns false

# You can Track changes to attributes with my_model.name_changed? accessor
my_model.name  # returns  "Name"