ruby - Sorting elements in DataMapper -


i have database, , need sort whole table length, i've got stack on it.

require 'dm-core' require 'dm-migrations' require 'sinatra/reloader'  datamapper.setup(:default, "sqlite3://#{dir.pwd}/development.db")  class item   include datamapper::resource    property :id, serial   property :length, integer end  ...  datamapper.finalize  post '/items/sort/?' 5.times     val = rand(100)     item.create(length: val)   end    item.update(item.sort_by { |_key, value| value })   redirect to('/items') end

how can perform correctly, database update sorted length elements? thank you.

item.sort_by(&:length)

above code achieve desired result. 

2.3.1 :001 > require './app.rb'  => true  2.3.1 :002 > item.all  => [#<item @id=1 @length=21>, #<item @id=2 @length=85>, #<item @id=3 @length=41>, #<item @id=4 @length=71>, #<item @id=5 @length=71>]  2.3.1 :003 > item.sort_by(&:length)  => [#<item @id=1 @length=21>, #<item @id=3 @length=41>, #<item @id=4 @length=71>, #<item @id=5 @length=71>, #<item @id=2 @length=85>]  2.3.1 :004 >

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