Created
October 5, 2011 19:40
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A special kind of sorting algorithm, where "Other" has to be the last item when sorted
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require 'ostruct' | |
module SortWithOther | |
def <=>(other) | |
if self.send(sort_field).downcase == "Other".downcase | |
1 | |
elsif other.send(sort_field).downcase == "Other".downcase | |
-1 | |
else | |
self.send(sort_field) <=> other.send(sort_field) | |
end | |
end | |
end | |
class Person | |
include SortWithOther | |
#sort_with_other :name, "Other" | |
attr_accessor :name | |
def initialize(name) | |
@name = name | |
end | |
def sort_field | |
:name | |
end | |
end | |
class Animal | |
include SortWithOther | |
#sort_with_other_attr :name, "Crap" | |
attr_reader :nickname | |
def initialize(nickname) | |
@nickname = nickname | |
end | |
def sort_field | |
:nickname | |
end | |
end | |
describe SortWithOther do | |
it "sorts a collection of Person objects" do | |
people = [ Person.new("Nate"), Person.new("Victor"), Person.new("Attila"), Person.new("Other")] | |
people.sort! | |
people.first.name.should == "Attila" | |
people.last.name.should == "Other" | |
end | |
it "sorts a collection of Animal objects" do | |
animals = [ Animal.new("Nate"), Animal.new("Victor"), Animal.new("Attila"), Animal.new("Other")] | |
animals.sort! | |
animals.first.nickname.should == "Attila" | |
animals.last.nickname.should == "Other" | |
end | |
it "sorts an OStruct" do | |
objects = [OpenStruct.new(:name => "Nate"), OpenStruct.new(:name => "Attila")] | |
objects.each do |person_object| | |
person_object.extend(SortWithOther) | |
class << person_object | |
def sort_field | |
:name | |
end | |
end | |
end | |
objects.sort! | |
objects.first.name.should == "Attila" | |
objects.last.name.should == "Nate" | |
end | |
end |
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