DB: Integridade referencial

db/migrate/031_create_fks.rb

@@ -0,0 +1,32 @@
+class CreateFks < ActiveRecord::Migration
+	def self.add_fk(table, fields, reference, cascade = true)
+		sql = "alter table #{table} add foreign key (#{fields}) references #{reference}"
+		sql = sql + " on update cascade on delete cascade" if cascade
+		execute sql
+	end
+
+	def self.up
+		add_fk :attachments, :course_id, :courses
+
+		add_fk :courses_users, :user_id, :users
+		add_fk :courses_users, :course_id, :courses
+
+		add_fk :events, :created_by, :users
+		add_fk :events, :course_id, :courses
+
+		add_fk :log_entries, :course_id, :courses
+		add_fk :log_entries, :user_id, :users
+
+		add_fk :messages, :sender_id, :users
+
+		add_fk :wiki_pages, :course_id, :courses
+		add_fk :wiki_pages, :user_id, :users
+
+		add_fk :wiki_page_versions, :wiki_page_id, :wiki_pages
+		add_fk :wiki_page_versions, :course_id, :courses
+		add_fk :wiki_page_versions, :user_id, :users
+	end
+
+	def self.down
+	end
+end

db/migrate/032_more_paranoid.rb

@@ -0,0 +1,13 @@
+class MoreParanoid < ActiveRecord::Migration
+	def self.up
+		add_column :courses, :deleted_at, :datetime
+		add_column :log_entries, :deleted_at, :datetime
+		add_column :users, :deleted_at, :datetime
+	end
+
+	def self.down
+		add_column :courses, :deleted_at
+		add_column :log_entries, :deleted_at
+		add_column :users, :deleted_at
+	end
+end

db/schema.rb

@@ -9,7 +9,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 30) do
+ActiveRecord::Schema.define(:version => 32) do
 
   create_table "attachments", :force => true do |t|
     t.string   "file_name",     :null => false
@@ -22,11 +22,12 @@ ActiveRecord::Schema.define(:version => 30) do
   end
 
   create_table "courses", :force => true do |t|
-    t.string  "short_name",                       :null => false
-    t.string  "full_name",                        :null => false
-    t.text    "description"
-    t.string  "code",        :default => "CK000", :null => false
-    t.integer "period",      :default => 1,       :null => false
+    t.string   "short_name",                       :null => false
+    t.string   "full_name",                        :null => false
+    t.text     "description"
+    t.string   "code",        :default => "CK000", :null => false
+    t.integer  "period",      :default => 1,       :null => false
+    t.datetime "deleted_at"
   end
 
   add_index "courses", ["short_name"], :name => "index_courses_on_short_name", :unique => true
@@ -52,6 +53,7 @@ ActiveRecord::Schema.define(:version => 30) do
     t.integer  "version"
     t.integer  "target_id"
     t.string   "type"
+    t.datetime "deleted_at"
   end
 
   create_table "messages", :force => true do |t|
@@ -71,8 +73,8 @@ ActiveRecord::Schema.define(:version => 30) do
     t.datetime "updated_at"
   end
 
-  add_index "sessions", ["updated_at"], :name => "index_sessions_on_updated_at"
   add_index "sessions", ["session_id"], :name => "index_sessions_on_session_id"
+  add_index "sessions", ["updated_at"], :name => "index_sessions_on_updated_at"
 
   create_table "users", :force => true do |t|
     t.string   "login",                              :null => false
@@ -88,6 +90,7 @@ ActiveRecord::Schema.define(:version => 30) do
     t.string   "login_key"
     t.boolean  "admin",           :default => false, :null => false
     t.string   "secret",                             :null => false
+    t.datetime "deleted_at"
   end
 
   create_table "wiki_page_versions", :force => true do |t|