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