Add model PassportConfirmation

app/models/passport_confirmation.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class PassportConfirmation < ApplicationRecord
+  belongs_to :passport
+  belongs_to :user
+
+  validates :user_id, uniqueness: { scope: :passport_id }
+end

db/migrate/20181130075817_create_passport_confirmations.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class CreatePassportConfirmations < ActiveRecord::Migration[5.2]
+  def change
+    create_table :passport_confirmations do |t|
+      t.timestamps null: false
+      t.references :passport, null: false, foreign_key: true
+      t.references :user,     null: false, foreign_key: true
+
+      t.index %i[passport_id user_id], unique: true
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_11_30_040846) do
+ActiveRecord::Schema.define(version: 2018_11_30_075817) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -51,6 +51,16 @@ ActiveRecord::Schema.define(version: 2018_11_30_040846) do
     t.text "comment"
   end
 
+  create_table "passport_confirmations", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.bigint "passport_id", null: false
+    t.bigint "user_id", null: false
+    t.index ["passport_id", "user_id"], name: "index_passport_confirmations_on_passport_id_and_user_id", unique: true
+    t.index ["passport_id"], name: "index_passport_confirmations_on_passport_id"
+    t.index ["user_id"], name: "index_passport_confirmations_on_user_id"
+  end
+
   create_table "passports", force: :cascade do |t|
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
@@ -120,6 +130,8 @@ ActiveRecord::Schema.define(version: 2018_11_30_040846) do
     t.index ["unlock_token"], name: "index_users_on_unlock_token", unique: true
   end
 
+  add_foreign_key "passport_confirmations", "passports"
+  add_foreign_key "passport_confirmations", "users"
   add_foreign_key "user_roles", "roles"
   add_foreign_key "user_roles", "users"
 end

factories/passport_confirmations.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :passport_confirmation do
+    passport
+    user
+  end
+end

spec/models/passport_confirmation_spec.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe PassportConfirmation do
+  subject { create :passport_confirmation }
+
+  it { is_expected.to belong_to(:passport).required }
+  it { is_expected.to belong_to(:user).required }
+
+  it do
+    is_expected.to validate_uniqueness_of(:user_id).scoped_to(:passport_id)
+  end
+end