first commit

README.md

@@ -1,56 +1,35 @@
 NAME
 ----
-  mongoid-grid_fs
+  mongoid-sequence
 
 INSTALL
 -------
-  gem install mongoid-grid_fs
+  gem install mongoid-sequence
 
 SYNOPSIS
 --------
 
 ````ruby
 
-  require 'mongoid-grid_fs'
+  require 'mongoid'
+  require 'mongoid-sequence'
 
-  g = GridFs.put readable
 
-  GridFS.get id
+  class Page
+    include Mongoid::Document
+    include Mongoid::Sequence
 
-  GridFS.delete id
+    sequence :number
+  end
+
+  p Page.create.number #=> 1
+  p Page.create.number #=> 2
+  p Page.create.number #=> 3
 
 
 ````
 
 DESCRIPTION
 -----------
-mongoid_grid_fs is a pure mongoid 3  / moped implementation of the mongodb
-grid_fs specification
-
-ref: http://www.mongodb.org/display/DOCS/GridFS+Specification
-
-it has the following features:
-
-- implementation is on top of mongoid for portability.  moped (the driver) is
-  barely used
-
-- simple, REST-like api
-
-- support for custom namespaces (fs.files vs. image.files)
-
-- pathnames and io-like objects can be written to the grid
-
-- auto-unique pathnames are generated (by default) to avoid collisions using #put
-
-    'path/info/a.rb' -> '$object_id/a.rb'
-
-- [] and []= methods which allow the grid to be used like a giant file
-  hash in the sky
-
-- supprt for data_uris
-
-  ````erb
-
-    <%= image_tag :src => file.data_uri %>
-
-  ````
+mongoid_sequence is a pure mongoid sequence generator based on mongodb's
+increment operator

Rakefile

@@ -1,8 +1,8 @@
 This.name =
-  "Mongoid::GridFs"
+  "Mongoid::Sequence"
 
 This.synopsis =
-  "a mongoid 3/moped compatible implementation of the grid_fs specification"
+  "a mongoid 3/moped compatible sequence generator for your models"
 
 This.rubyforge_project = 'codeforpeople'
 This.author            = "Ara T. Howard"

lib/mongoid-sequence.rb

@@ -0,0 +1,125 @@
+require 'mongoid'
+
+module Mongoid
+  module Sequence
+    def Sequence.version
+      '1.0.0'
+    end
+
+    ClassMethods = proc do
+      def sequence(fieldname, *args, &block)
+        options = args.extract_options!.to_options!
+
+        sequence_name = (
+          options.delete(:sequence) || sequence_name_for(fieldname)
+        )
+
+        args.push(options)
+
+        before_create do |doc|
+          doc[fieldname] = SequenceGenerator.for(sequence_name).next
+        end
+
+        field(fieldname, *args, &block)
+
+        SequenceGenerator.for(sequence_name)
+      end
+
+      def sequence_for(fieldname)
+        SequenceGenerator.for(sequence_name_for(fieldname))
+      end
+
+      def sequence_name_for(fieldname)
+        SequenceGenerator.sequence_name_for(self, fieldname)
+      end
+    end
+
+    InstanceMethods = proc do
+      def sequence_for(fieldname)
+        self.class.sequence_for(fieldname)
+      end
+    end
+
+    def Sequence.included(other)
+      other.send(:instance_eval, &ClassMethods)
+      other.send(:class_eval, &InstanceMethods)
+      super
+    end
+  end
+
+  class SequenceGenerator
+    include Mongoid::Document
+
+    field(:name, :type => String)
+
+    field(:value, :default => 0, :type => Integer)
+
+    validates_presence_of(:name)
+    validates_uniqueness_of(:name)
+
+    validates_presence_of(:value)
+
+    index({:name => 1}, {:unique => true})
+
+    Cache = Hash.new
+
+    class << self
+      def for(name)
+        name = name.to_s
+
+        Cache[name] ||= (
+          begin
+            create!(:name => name)
+          rescue
+            where(:name => name).first || create!(:name => name)
+          end
+        )
+      end
+
+      alias_method('[]', 'for')
+
+      def sequence_name_for(klass, fieldname)
+        "#{ klass.name.underscore }-#{ fieldname }"
+      end
+    end
+
+    after_destroy do |sequence|
+      Cache.delete(sequence.name)
+    end
+
+    def next
+      inc(:value, 1)
+    end
+
+    def current_value
+      reload.value
+    end
+
+    def reset!
+      update_attributes!(:value => 0)
+    end
+  end
+end
+
+
+
+
+if $0 == __FILE__
+
+  Mongoid.configure do |config|
+    config.connect_to('mongoid-sequence')
+  end
+
+  class A
+    include Mongoid::Document
+    include Mongoid::Sequence
+
+    p sequence(:number)
+  end
+
+  A.sequence_for(:number).destroy
+  
+  a = A.create!
+  p a
+
+end

mongoid-sequence.gemspec

@@ -0,0 +1,36 @@
+## mongoid-sequence.gemspec
+#
+
+Gem::Specification::new do |spec|
+  spec.name = "mongoid-sequence"
+  spec.version = "1.0.0"
+  spec.platform = Gem::Platform::RUBY
+  spec.summary = "mongoid-sequence"
+  spec.description = "a mongoid 3/moped compatible sequence generator for your models"
+
+  spec.files =
+["README.md",
+ "Rakefile",
+ "lib",
+ "lib/mongoid-sequence.rb",
+ "test",
+ "test/helper.rb",
+ "test/mongoid-sequence.rb",
+ "test/mongoid-sequence_test.rb",
+ "test/testing.rb"]
+
+  spec.executables = []
+  
+  spec.require_path = "lib"
+
+  spec.test_files = "test/mongoid-sequence.rb"
+
+  
+
+  spec.extensions.push(*[])
+
+  spec.rubyforge_project = "codeforpeople"
+  spec.author = "Ara T. Howard"
+  spec.email = "ara.t.howard@gmail.com"
+  spec.homepage = "https://github.com/ahoward/mongoid-sequence"
+end

test/helper.rb

@@ -1,18 +1,8 @@
 # -*- encoding : utf-8 -*-
+require 'pp'
 require_relative 'testing'
-require_relative '../lib/mongoid-grid_fs.rb'
+require_relative '../lib/mongoid-sequence.rb'
 
 Mongoid.configure do |config|
-  config.connect_to('mongoid-grid_fs_test')
-end
-
-require 'stringio'
-
-class SIO < StringIO
-  attr_accessor :filename
-
-  def initialize(filename, *args, &block)
-    @filename = filename
-    super(*args, &block)
-  end
+  config.connect_to('mongoid-sequence')
 end

test/mongoid-sequence.rb

@@ -0,0 +1,84 @@
+require_relative 'helper'
+
+Testing Mongoid::Sequence do
+##
+#
+  Sequence =
+    Mongoid::Sequence
+
+  SequenceGenerator =
+    Mongoid::SequenceGenerator
+
+  prepare do
+    SequenceGenerator.destroy_all
+  end
+
+##
+#
+  test 'can be included' do
+    assert do
+      model_class do
+        include Mongoid::Sequence
+      end
+    end
+  end
+
+  test 'provided a "sequence" class method that builds a field' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    assert{ m.fields['number'].name == 'number' }
+  end
+
+  test 'autoincrements the field on create' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    10.times do |i|
+      assert{ m.create.number == i.succ }
+    end
+  end
+
+  test 'allows the sequence to be reset' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    assert{ m.sequence_for(:number).reset! }
+    assert{ m.sequence_for(:number).next == 1 }
+    assert{ m.sequence_for(:number).next != 1 }
+    assert{ m.sequence_for(:number).reset! }
+    assert{ m.sequence_for(:number).next == 1 }
+  end
+
+
+
+protected
+  def model_class(&block)
+    m = Class.new
+    m.class_eval do
+      def m.name() 'm' end
+      include Mongoid::Document
+    end
+    m.destroy_all
+    m.class_eval(&block) if block
+    m
+  end
+end

test/mongoid-sequence_test.rb

@@ -0,0 +1,84 @@
+require_relative 'helper'
+
+Testing Mongoid::Sequence do
+##
+#
+  Sequence =
+    Mongoid::Sequence
+
+  SequenceGenerator =
+    Mongoid::SequenceGenerator
+
+  prepare do
+    SequenceGenerator.destroy_all
+  end
+
+##
+#
+  test 'can be included' do
+    assert do
+      model_class do
+        include Mongoid::Sequence
+      end
+    end
+  end
+
+  test 'provided a "sequence" class method that builds a field' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    assert{ m.fields['number'].name == 'number' }
+  end
+
+  test 'autoincrements the field on create' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    10.times do |i|
+      assert{ m.create.number == i.succ }
+    end
+  end
+
+  test 'allows the sequence to be reset' do
+    m =
+      assert do
+        model_class do
+          include Mongoid::Sequence
+
+          sequence 'number'
+        end
+      end
+
+    assert{ m.sequence_for(:number).reset! }
+    assert{ m.sequence_for(:number).next == 1 }
+    assert{ m.sequence_for(:number).next != 1 }
+    assert{ m.sequence_for(:number).reset! }
+    assert{ m.sequence_for(:number).next == 1 }
+  end
+
+
+
+protected
+  def model_class(&block)
+    m = Class.new
+    m.class_eval do
+      def m.name() 'm' end
+      include Mongoid::Document
+    end
+    m.destroy_all
+    m.class_eval(&block) if block
+    m
+  end
+end