Add AndroidDeviceRegistrationToken model belonging to user

app/models/android_device_registration_token.rb

@@ -0,0 +1,3 @@
+class AndroidDeviceRegistrationToken < ActiveRecord::Base
+  belongs_to :user
+end

app/models/user.rb

@@ -23,6 +23,7 @@ class User < ActiveRecord::Base
   has_many :outgoing_requests,
     class_name: 'Request', foreign_key: 'creditor_id'
   has_many :notifications
+  has_many :android_device_registration_tokens, class_name: 'AndroidDeviceRegistrationToken', foreign_key: 'user_id'
 
   has_many :issued_transactions, as: :issuer, class_name: 'Transaction'
 

db/migrate/20190508192738_create_android_device_registration_tokens.rb

@@ -0,0 +1,10 @@
+class CreateAndroidDeviceRegistrationTokens < ActiveRecord::Migration[5.2]
+  def change
+    create_table :android_device_registration_tokens do |t|
+      t.string :token
+      t.belongs_to :user, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_06_20_161021) do
+ActiveRecord::Schema.define(version: 2019_05_08_192738) do
+
+  create_table "android_device_registration_tokens", force: :cascade do |t|
+    t.string "token"
+    t.integer "user_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["user_id"], name: "index_android_device_registration_tokens_on_user_id"
+  end
 
   create_table "clients", force: :cascade do |t|
     t.string "name", null: false

spec/factories/android_device_registration_tokens.rb

@@ -0,0 +1,6 @@
+FactoryGirl.define do
+  factory :android_device_registration_token do
+    token "MyString"
+    user nil
+  end
+end

spec/models/android_device_registration_token_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe AndroidDeviceRegistrationToken, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end