David Furber dfurber

## a_turbolinks_spinner.md

      
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                dfurber
                / a_turbolinks_spinner.md
            
            
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              January 30, 2018 07:32
            
              
                Add a loading indicator to turbolinks so the user knows when pages are loading. 
              
          
    There are 4 parts:

the html partial which goes into your layout
the scss block to add to your stylesheet
the coffeescript to add to your application.coffee
the image. The image is not included here, but go here and "Save image": http://aragats.herokuapp.com/assets/ajax-loader.gif - or go here http://www.ajaxload.info/ and generate your own loader image.


## ActiveRecord_createCommand.php
<?php

class ActiveRecord extends CActiveRecord
{
    /**
     * Create and configure a CDbCommand instance based on current criteria.
     *
     * Think twice before using this method - use only in cases where being able to stream
     * through the raw SQL record-sets is crucial, usually for performance reasons, when
     * dealing with very large record sets.

## RadiusSearchBehavior.php
<?php

class RadiusSearchBehavior extends CActiveRecordBehavior
{
    public function byPointRadius($lat, $lng, $radius)
    {
        $radius = (float)$radius;
        $distance = "((ACOS(SIN(:lat * PI() / 180) * SIN(lat * PI() / 180) + COS(:lat * PI() / 180) * COS(lat * PI() / 180) * COS((:lng - lng) * PI() / 180)) * 180 / PI()) * 60 * 1.1515)";
        $condition = "lat BETWEEN " . ($lat - $radius / 69.2) . " AND " . ($lat + $radius / 69.2) . " AND lng BETWEEN " . ($lng - $radius / 69.2) . " AND " . ($lng + $radius / 69.2) . " AND $distance<=:radius";
        return $this->owner->where($condition, array('lat' => $lat, 'lng' => $lng, 'radius' => $radius));

## ruby_tail_recursion.rb
items = %w{foo bar baz goo gar gaz hoo har haz}

def recurse_array(ary, &block)
  head, *tail = ary
  head and block.call(head)
  tail.any? and recurse_array(tail, &block)
end

puts "First the items in order:\n"
recurse_array items do |item|

## union_query.rb
module UnionQuery
  extend ActiveSupport::Concern

  included do
    def self.union(relation_to_unite, type=nil)
      LazyUnionQuery.new self, relation_to_unite, type
    end
  end

end

## union_queries.rb
module UnionQuery
  extend ActiveSupport::Concern

  included do

    def self.union(query1, query2, params={}, type='all')
      find_by_sql "#{query1.to_sql} UNION #{type} #{query2.to_sql}", params
    end

    def self.unite_with(query2)

## builder.coffee
do ->
    setOptions = (el, attributes) ->
        for own key, value of attributes
            el.setAttribute key, value
        el

    _(['ol','ul','li','span','strong','p','h1','h2','h3','h4']).each (tag) ->
      window["_#{tag}"] = (html, attributes, children...) ->
        el = document.createElement tag
        if attributes?

## templates.coffee
# Template rendering in JS
# Combines John Resig's simple js templates with Sproutcore's content binding concept.
# Define your templates in the templates array (or rewrite it to work however you like!)
#
# To render a template to an html string, call:
# render('example', dataObject)
# OR
# render('example', arrayOfDataObjects)
# OR if you have template that isn't bound to a data object:
# render('static_example')

## coffee_script_tricks.coffee
# These are my notes from the PragProg book on CoffeeScript of things that either
# aren't in the main CS language reference or I didn't pick them up there. I wrote
# them down before I forgot, and put it here for others but mainly as a reference for
# myself.

# assign arguments in constructor to properties of the same name:
class Thingie
    constructor: (@name, @url) ->

# is the same as:

## exception.php
<!DOCTYPE html PUBLIC
	"-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title><?php echo CHtml::encode($data['type'])?></title>

<style type="text/css">
/*<![CDATA[*/
	<?php

	class ActiveRecord extends CActiveRecord
	{
	/**
	* Create and configure a CDbCommand instance based on current criteria.
	*
	* Think twice before using this method - use only in cases where being able to stream
	* through the raw SQL record-sets is crucial, usually for performance reasons, when
	* dealing with very large record sets.
	<?php

	class RadiusSearchBehavior extends CActiveRecordBehavior
	{
	public function byPointRadius($lat, $lng, $radius)
	{
	$radius = (float)$radius;
	$distance = "((ACOS(SIN(:lat * PI() / 180) * SIN(lat * PI() / 180) + COS(:lat * PI() / 180) * COS(lat * PI() / 180) * COS((:lng - lng) * PI() / 180)) * 180 / PI()) * 60 * 1.1515)";
	$condition = "lat BETWEEN " . ($lat - $radius / 69.2) . " AND " . ($lat + $radius / 69.2) . " AND lng BETWEEN " . ($lng - $radius / 69.2) . " AND " . ($lng + $radius / 69.2) . " AND $distance<=:radius";
	return $this->owner->where($condition, array('lat' => $lat, 'lng' => $lng, 'radius' => $radius));
	items = %w{foo bar baz goo gar gaz hoo har haz}

	def recurse_array(ary, &block)
	head, *tail = ary
	head and block.call(head)
	tail.any? and recurse_array(tail, &block)
	end

	puts "First the items in order:\n"
	recurse_array items do \|item\|
	module UnionQuery
	extend ActiveSupport::Concern

	included do
	def self.union(relation_to_unite, type=nil)
	LazyUnionQuery.new self, relation_to_unite, type
	end
	end

	end
	do ->
	setOptions = (el, attributes) ->
	for own key, value of attributes
	el.setAttribute key, value
	el

	_(['ol','ul','li','span','strong','p','h1','h2','h3','h4']).each (tag) ->
	window["_#{tag}"] = (html, attributes, children...) ->
	el = document.createElement tag
	if attributes?
	# Template rendering in JS
	# Combines John Resig's simple js templates with Sproutcore's content binding concept.
	# Define your templates in the templates array (or rewrite it to work however you like!)
	#
	# To render a template to an html string, call:
	# render('example', dataObject)
	# OR
	# render('example', arrayOfDataObjects)
	# OR if you have template that isn't bound to a data object:
	# render('static_example')
	# These are my notes from the PragProg book on CoffeeScript of things that either
	# aren't in the main CS language reference or I didn't pick them up there. I wrote
	# them down before I forgot, and put it here for others but mainly as a reference for
	# myself.

	# assign arguments in constructor to properties of the same name:
	class Thingie
	constructor: (@name, @url) ->

	# is the same as:
	<!DOCTYPE html PUBLIC
	"-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
	<title><?php echo CHtml::encode($data['type'])?></title>

	<style type="text/css">
	/<![CDATA[/