From 7a5555b1ac542e5fd5680cefaba3574677ecaa46 Mon Sep 17 00:00:00 2001
From: hukl <hukl@eight.local>
Date: Mon, 2 Feb 2009 00:22:54 +0100
Subject: aggregation spike with flags associated to pages

Page has now a named_scope :with_flags which
accepts an array of flag names and returns
corresponding pages. Can be chained with order and
limit
---
 app/models/flag.rb                                 |  3 +++
 app/models/page.rb                                 | 22 +++++++++++-----------
 db/migrate/20090201211159_create_flags.rb          | 13 +++++++++++++
 ...0090201211523_add_join_table_for_flags_pages.rb | 15 +++++++++++++++
 test/fixtures/flags.yml                            |  7 +++++++
 test/unit/flag_test.rb                             |  8 ++++++++
 6 files changed, 57 insertions(+), 11 deletions(-)
 create mode 100644 app/models/flag.rb
 create mode 100644 db/migrate/20090201211159_create_flags.rb
 create mode 100644 db/migrate/20090201211523_add_join_table_for_flags_pages.rb
 create mode 100644 test/fixtures/flags.yml
 create mode 100644 test/unit/flag_test.rb

diff --git a/app/models/flag.rb b/app/models/flag.rb
new file mode 100644
index 0000000..6d67377
--- /dev/null
+++ b/app/models/flag.rb
@@ -0,0 +1,3 @@
+class Flag < ActiveRecord::Base
+  has_and_belongs_to_many :pages
+end
diff --git a/app/models/page.rb b/app/models/page.rb
index 3d02e9f..d5d888f 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -1,9 +1,19 @@
 class Page < ActiveRecord::Base
   
   belongs_to :node
+  has_and_belongs_to_many :flags
   
   acts_as_list :column => :revision, :scope => :node_id
   
+  named_scope :with_flags, lambda {|flag_names| 
+    if (flags = Flag.find_all_by_name(flag_names)).empty?
+      {}
+    else
+      {:include => :flags, :conditions => ['flags_pages.flag_id IN (?)', flags.map(&:id)] }
+    end
+  }
+  
+  
   
   # <aggregate 
   #   flags="updates pressemitteilungen"
@@ -29,14 +39,4 @@ class Page < ActiveRecord::Base
       :order => "#{options[:order_by]} #{options[:order_direction]}"
     )
   end
-end
-
-
-named_scope :flagged_as, lambda { |flags| 
-  conditions = {}
-  flags.each do |flag|
-    conditions[flag] = true
-  end
-  
-  { :conditions => conditions }
-}
\ No newline at end of file
+end
\ No newline at end of file
diff --git a/db/migrate/20090201211159_create_flags.rb b/db/migrate/20090201211159_create_flags.rb
new file mode 100644
index 0000000..3b9da43
--- /dev/null
+++ b/db/migrate/20090201211159_create_flags.rb
@@ -0,0 +1,13 @@
+class CreateFlags < ActiveRecord::Migration
+  def self.up
+    create_table :flags do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+
+  def self.down
+    drop_table :flags
+  end
+end
diff --git a/db/migrate/20090201211523_add_join_table_for_flags_pages.rb b/db/migrate/20090201211523_add_join_table_for_flags_pages.rb
new file mode 100644
index 0000000..99eb9c9
--- /dev/null
+++ b/db/migrate/20090201211523_add_join_table_for_flags_pages.rb
@@ -0,0 +1,15 @@
+class AddJoinTableForFlagsPages < ActiveRecord::Migration
+  def self.up
+    create_table :flags_pages, :id => false do |t|
+      t.integer :flag_id
+      t.integer :page_id
+    end
+    add_index :flags_pages, [:flag_id]
+    add_index :flags_pages, [:page_id]
+  end
+  
+  def self.down
+    remove_table :flags_pages
+  end
+  
+end
diff --git a/test/fixtures/flags.yml b/test/fixtures/flags.yml
new file mode 100644
index 0000000..157d747
--- /dev/null
+++ b/test/fixtures/flags.yml
@@ -0,0 +1,7 @@
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString
diff --git a/test/unit/flag_test.rb b/test/unit/flag_test.rb
new file mode 100644
index 0000000..49b0d96
--- /dev/null
+++ b/test/unit/flag_test.rb
@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class FlagTest < ActiveSupport::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end
-- 
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