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Rails.html
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<html>
<head>
<link rel="Stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootswatch/3.3.7/cosmo/bootstrap.min.css" />
<title>Rails</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.8.0/styles/default.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.8.0/highlight.min.js"></script>
<script>
window.onload = function() {
var allPre, i, j;
allPre = document.getElementsByTagName("pre");
for (i = 0, j = allPre.length; i < j; i++) {
hljs.highlightBlock(allPre[i]);
}
};
</script>
</head>
<body>
<a href="https://github.com/coisnepe/vimwiki_html" class="github-corner" aria-label="View source on Github"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a>
<a href="index.html">Index</a>
<hr>
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<div id="Ruby on Rails"><h2 id="Ruby on Rails">Ruby on Rails</h2></div>
<ul>
<li>
<a href="Rails.html#String">String</a>
<li>
<a href="Rails.html#Validations">Validations</a>
<li>
<a href="Rails.html#Rake commands">Rake commands</a>
<li>
<a href="Rails.html#Queries">Queries</a>
<li>
<a href="Rails.html#Various">Various</a>
<li>
<a href="Rails.html#Console">Console</a>
</ul>
<p>
<br/>
</p>
<div id="Ruby on Rails-String"><h4 id="String">String</h4></div>
<pre class="ruby">
# `strip` on steroids: remove extra whitespaces around and within a string
> " The amount of whitespace is too damn high ".squish
</pre>
<p>
<br/>
</p>
<div id="Ruby on Rails-Validations"><h4 id="Validations">Validations</h4></div>
<pre class="ruby">
# Check an AR object's validations: User.first._validators
# Presence
validates :name, presence: true
validates :name, :login, :email, presence: true
# Acceptance (checkbox should be ticked before going further)
validates :terms_of_service, acceptance: true
validates :terms_of_service, acceptance: { accept: 'yes' }
validates :name, length: { minimum: 2 }
validates :bio, length: { maximum: 500 }
validates :password, length: { in: 6..20 }
validates :registration_number, length: { is: 6 }
# Numericality
validates :points, numericality: true
validates :games_played, numericality: { only_integer: true }
:greater_than
:greater_than_or_equal_to
:equal_to
:less_than
:less_than_or_equal_to
:odd
:even
# Uniqueness
validates :email, uniqueness: true
validates :name, uniqueness: { scope: :year,
message: "should happen once per year" }
validates :name, uniqueness: { case_sensitive: false }
# "On" (only checks something for the specified operation)
validates :email, uniqueness: true, on: :create # ( only validates uniqueness when Create)
validates :age, numericality: true, on: :update # ( only validates numericality on Update)
</pre>
<p>
<br/>
</p>
<div id="Ruby on Rails-Rake commands"><h4 id="Rake commands">Rake commands</h4></div>
<pre>
List rake tasks
$ rake -T
Inventory of TODO, FIXME, OPTIMIZE, etc... comments in the project
$ rake notes
</pre>
<p>
Boot up the server on 192.168.1.23:3003
</p>
<pre>
rails s -p 3003 -b 192.168.1.23
</pre>
<p>
"Address already in use - bind(2) for "::1" port 3000"
</p>
<pre>
ps aux | grep "tcp://localhost:3000" | grep -v grep | awk '{print $2}' | xargs kill -9
</pre>
<p>
<br/>
</p>
<div id="Ruby on Rails-Queries"><h4 id="Queries">Queries</h4></div>
<pre class="ruby">
User.joins(:customers).where(customer: { age: 40 })
# User.joins(:customers).where("customer.age = 40")
</pre>
<p>
<br />
</p>
<div id="Ruby on Rails-Various"><h4 id="Various">Various</h4></div>
<pre class="ruby">
Object.const_set(params["class_name"].classify, Class.new(ActiveRecord::Base)
</pre>
<p>
<br />
</p>
<div id="Ruby on Rails-Console"><h4 id="Console">Console</h4></div>
<p>
Execute raw SQL on the db
</p>
<pre class="ruby">
conn = ActiveRecord::Base.connection
conn.execute("SELECT * FROM users")
</pre>
<p>
Require a gem that's installed on the system, but not present in the Gemfile
</p>
<pre class="code">
> gem which awesome_print
~> '/usr/local/lib/ruby/gems/1.9.1/gems/awesome_print-1.7.0/lib/awesome_print.rb'
> $: << '/usr/local/lib/ruby/gems/1.9.1/gems/awesome_print-1.7.0/lib'
> require "awesome_print"
</pre>
</div>
</div>
</div>
</body>
</html>