API for app usage tracking

app/controllers/app_usages_controller.rb

@@ -0,0 +1,25 @@
+class AppUsagesController < ApplicationController
+  before_filter :authenticate_device
+  respond_to :json
+  
+  def create
+    app_usage = AppUsage.new(app_usage_params)
+    if app_usage.save
+      render json: {}, 
+            status: :created
+    else
+      logger.warn "Error while saving App Usage #{app_usage.errors.full_messages}"
+      render json: {}, 
+              status: :unprocessable_entity
+    end
+  end
+  private
+
+  def app_usage_params
+    params.require(:app_usage).
+      permit(:package_name,
+            :usage_duration_in_seconds,
+            :used_on)
+              
+  end
+end

app/models/app_usage.rb

@@ -0,0 +1,3 @@
+class AppUsage < ActiveRecord::Base
+  validates :package_name, :usage_duration_in_seconds, :used_on, presence: true
+end

config/routes.rb

@@ -1,4 +1,6 @@
 Rails.application.routes.draw do
+  post 'app_usages/create', to: 'app_usages#create', :defaults => { :format => :json }
+
   devise_for :admin_users, ActiveAdmin::Devise.config
 
   post 'heartbeats', to: 'heartbeats#create', :defaults => { :format => :json }

db/migrate/20160204094618_create_app_usages.rb

@@ -0,0 +1,11 @@
+class CreateAppUsages < ActiveRecord::Migration
+  def change
+    create_table :app_usages do |t|
+      t.string :package_name, null: false, index: false
+      t.integer :usage_duration_in_seconds, null: false, index: false
+      t.date :used_on, null: false, index: false
+
+      t.timestamps null: false
+    end
+  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: 20151118101616) do
+ActiveRecord::Schema.define(version: 20160204094618) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -49,6 +49,14 @@ ActiveRecord::Schema.define(version: 20151118101616) do
   add_index "admin_users", ["email"], name: "index_admin_users_on_email", unique: true, using: :btree
   add_index "admin_users", ["reset_password_token"], name: "index_admin_users_on_reset_password_token", unique: true, using: :btree
 
+  create_table "app_usages", force: :cascade do |t|
+    t.string   "package_name",              null: false
+    t.integer  "usage_duration_in_seconds", null: false
+    t.date     "used_on",                   null: false
+    t.datetime "created_at",                null: false
+    t.datetime "updated_at",                null: false
+  end
+
   create_table "apps", force: :cascade do |t|
     t.string   "name"
     t.string   "package_name"

spec/controllers/app_usages_controller_spec.rb

@@ -0,0 +1,28 @@
+require 'rails_helper'
+
+RSpec.describe AppUsagesController, type: :controller do
+
+  describe "POST #create" do
+    describe "Authorized" do
+      let(:device){create(:device)}
+      before(:each) do
+        request.env['HTTP_AUTHORIZATION'] = ActionController::HttpAuthentication::Token.encode_credentials(device.access_token)
+      end
+      it "Valid params" do
+        post :create, app_usage: attributes_for(:app_usage), format: :json
+        expect(response).to have_http_status(:success)
+      end
+
+      it "InValid Params" do
+        post :create, app_usage: attributes_for(:invalid_app_usage), format: :json
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
+    end
+    describe "POST #create" do
+      it "Unauthorized" do
+        post :create, app_usage: attributes_for(:app_usage), format: :json
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+end

spec/factories/app_usages.rb

@@ -0,0 +1,13 @@
+FactoryGirl.define do
+  factory :app_usage do
+    package_name "com.facebook.katana"
+    usage_duration_in_seconds 7000
+    used_on Date.today - 1.day
+  end
+  factory :invalid_app_usage, class: AppUsage do
+    package_name ""
+    usage_duration_in_seconds 7000
+    used_on Date.today - 1.day
+  end
+
+end

spec/models/app_usage_spec.rb

@@ -0,0 +1,9 @@
+require 'rails_helper'
+
+RSpec.describe AppUsage, type: :model do
+  let!(:app_usage) { create(:app_usage) }
+
+  it { should validate_presence_of :package_name } 
+  it { should validate_presence_of :usage_duration_in_seconds } 
+  it { should validate_presence_of :used_on } 
+end