Namespace model added. Migration to convert exit project/groups

app/models/namespace.rb

@@ -0,0 +1,20 @@
+class Namespace < ActiveRecord::Base
+  attr_accessible :code, :name, :owner_id
+
+  has_many :projects
+  belongs_to :owner, class_name: "User"
+
+  validates :name, presence: true, uniqueness: true
+  validates :code, presence: true, uniqueness: true
+  validates :owner, presence: true
+
+  delegate :name, to: :owner, allow_nil: true, prefix: true
+
+  def self.search query
+    where("name LIKE :query OR code LIKE :query", query: "%#{query}%")
+  end
+
+  def to_param
+    code
+  end
+end