Add release model

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/release.rb

+class Release < ActiveRecord::Base
+end

db/migrate/20151105094515_create_releases.rb

+class CreateReleases < ActiveRecord::Migration
+  def change
+    create_table :releases do |t|
+      t.string :tag
+      t.text :description
+      t.integer :project_id
+
+      t.timestamps
+    end
+
+    add_index :releases, :project_id
+    add_index :releases, [:project_id, :tag]
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151026182941) do
+ActiveRecord::Schema.define(version: 20151105094515) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -637,6 +637,17 @@ ActiveRecord::Schema.define(version: 20151026182941) do
 
   add_index "protected_branches", ["project_id"], name: "index_protected_branches_on_project_id", using: :btree
 
+  create_table "releases", force: true do |t|
+    t.string   "tag"
+    t.text     "description"
+    t.integer  "project_id"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "releases", ["project_id", "tag"], name: "index_releases_on_project_id_and_tag", using: :btree
+  add_index "releases", ["project_id"], name: "index_releases_on_project_id", using: :btree
+
   create_table "sent_notifications", force: true do |t|
     t.integer "project_id"
     t.integer "noteable_id"

spec/factories/releases.rb

+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :release do
+    tag "MyString"
+    description "MyText"
+    project_id 1
+  end
+end

spec/models/release_spec.rb

+require 'rails_helper'
+
+RSpec.describe Release, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end