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• Apache conf
• Enable URL with OVH

Apache conf

cd /etc/apache2/sites-available

touch my-url.domaine.com.conf

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Create mails with a new domain name

go to http://www.google.fr/intl/fr/enterprise/apps/business/products/gmail/

###Account Start it, fill fields...

###Check the domain Go to configuration, and valid the 2 first steps #####Step "google-site-verification" : On OVH, go to your domain, DNS area, add new entry. Choose TXT and set the value with google-site-verification=a_really_fat_string.

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gid = class_instance.to_global_id # method allowing to get a string with both model name and id
GlobalID::Locator.locate(gid) # method of getting the object by its global id (very useful for collections of multiple type of objects, e.g. for polymorphic associations)
Example :

In the model that has a polymorphic attribute detailable:

getter:

  def global_detailable
    detailable.to_global_id if detailable.present?

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Pandas, Numpy, SciPy - libraries for vectorized calculations of non structured data
Folium - geographic data
iPython - work environment

List ~ Array (methods: append, insert, del)
Dictionary (dict) ~ Hash
.type ~ .class
| ~ ||
& ~ &&

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config.time_zone #ActiveRecord fetches the UTC time from the database and converts it to the time zone in 
DateTime #if you need support for times very far from the present

# Good practices

2.hours.ago # => Thu, 27 Aug 2015 14:39:36 AFT +04:30
1.day.from_now # => Fri, 28 Aug 2015 16:39:36 AFT +04:30
Time.zone.parse("2015-08-27T12:09:36Z") # => Thu, 27 Aug 2015 16:39:36 AFT +04:30
Time.current # => Thu, 27 Aug 2015 16:39:36 AFT +04:30
Time.current.utc.iso8601 # When supliyng an API ("2015-08-27T12:09:36Z")

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# search(column name ('or' to be able to search in several columns + type de recherche, e.g. 'end' - last characters of the column, 'cont' - contains)
User.search('email_end' => 'gmail.com').result
User.search('first_name_or_last_name_cont' => 'bob').result

ActiveAdmin.describe User do
  filter :first_name_cont, label: 'First Name'
end

# association name + name of column in the associated model + type of search
ActiveAdmin.describe User do

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# using bsearch wherenever possible :)

require 'benchmark'

data = (0..50_000_000)

Benchmark.bm do |x|
  x.report(:find) { data.find {|number| number > 40_000_000 } }
  x.report(:bsearch) { data.bsearch {|number| number > 40_000_000 } }
end

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a = ["a", "b", "c"]
a.slice(1, 2)
# => ["b", "c"]

a = ["a", "b", "c"]
a.slice_before("b").to_a
# => [["a"], ["b", "c"]]

a = ["000", "b", "999"]
a.slice_before(/[a-z]/).to_a

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# to_i and to_int;
# to_s and to_str;
# to_a and to_ary;
# to_h and to_hash.

"string" + other #will call to_str on other, [1,2,3] + other will call #to_ary and so on (and will raise TypeError: no implicit conversion if object not responds to this methods);
"string" * other || [1,2,3] * other # will call #to_int on other;
a, b, c = *other # will call other to_ary (and, therefore, can be used to “unpack” custom collection objects—but also can cause unintended behavior, if other implements to_ary but was not thought as a collection);
some_method(*other) #—same as above, uses other#to_ary;
some_method(**other) #—new in Ruby 2, uses other#to_hash.

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// child combinator (>)
ol > li {
  color: red;
}


//  general sibling combinator (~) 
.featured-image ~ p {
  font-size: 90%;
}