Add model MembershipPoolAccount

app/models/account.rb

@@ -9,6 +9,10 @@ class Account < ApplicationRecord
 
   has_many :passport_confirmations, dependent: :restrict_with_exception
 
+  has_many :membership_pool_accounts, dependent: :restrict_with_exception
+
+  has_many :membership_pools, through: :membership_pool_accounts
+
   scope :guests, -> { includes(:user).where(users: { id: nil }) }
 
   def guest?

app/models/membership_pool.rb

@@ -5,5 +5,9 @@ class MembershipPool < ApplicationRecord
 
   has_many :membership_apps, through: :membership_pool_apps
 
+  has_many :membership_pool_accounts, dependent: :restrict_with_exception
+
+  has_many :accounts, through: :membership_pool_accounts
+
   validates :name, presence: true
 end

app/models/membership_pool_account.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class MembershipPoolAccount < ApplicationRecord
+  belongs_to :membership_pool
+  belongs_to :account
+
+  validates :account_id, uniqueness: { scope: :membership_pool_id }
+end

db/migrate/20181206205529_create_membership_pool_accounts.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class CreateMembershipPoolAccounts < ActiveRecord::Migration[5.2]
+  def change
+    create_table :membership_pool_accounts do |t|
+      t.timestamps null: false
+
+      t.references :membership_pool, null: false, foreign_key: true
+      t.references :account,         null: false, foreign_key: true
+
+      t.index %i[membership_pool_id account_id],
+              name:   'index_membership_pool_accounts_on_pool_and_account',
+              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_12_06_194527) do
+ActiveRecord::Schema.define(version: 2018_12_06_205529) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -77,6 +77,16 @@ ActiveRecord::Schema.define(version: 2018_12_06_194527) do
     t.index ["country_state_id"], name: "index_membership_apps_on_country_state_id"
   end
 
+  create_table "membership_pool_accounts", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.bigint "membership_pool_id", null: false
+    t.bigint "account_id", null: false
+    t.index ["account_id"], name: "index_membership_pool_accounts_on_account_id"
+    t.index ["membership_pool_id", "account_id"], name: "index_membership_pool_accounts_on_pool_and_account", unique: true
+    t.index ["membership_pool_id"], name: "index_membership_pool_accounts_on_membership_pool_id"
+  end
+
   create_table "membership_pool_apps", force: :cascade do |t|
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
@@ -187,6 +197,8 @@ ActiveRecord::Schema.define(version: 2018_12_06_194527) do
   add_foreign_key "account_roles", "roles"
   add_foreign_key "membership_apps", "accounts"
   add_foreign_key "membership_apps", "country_states"
+  add_foreign_key "membership_pool_accounts", "accounts"
+  add_foreign_key "membership_pool_accounts", "membership_pools"
   add_foreign_key "membership_pool_apps", "membership_apps"
   add_foreign_key "membership_pool_apps", "membership_pools"
   add_foreign_key "passport_confirmations", "accounts"

factories/membership_pool_accounts.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :membership_pool_account do
+    association :membership_pool
+    association :account, factory: :account_with_user
+  end
+end

spec/models/account_spec.rb

@@ -23,6 +23,18 @@ RSpec.describe Account do
       .dependent(:restrict_with_exception)
   end
 
+  it do
+    is_expected.to \
+      have_many(:membership_pool_accounts)
+      .dependent(:restrict_with_exception)
+  end
+
+  it do
+    is_expected.to \
+      have_many(:membership_pools)
+      .through(:membership_pool_accounts)
+  end
+
   it { is_expected.not_to validate_presence_of :user }
 
   pending '.guests'

spec/models/membership_pool_account_spec.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe MembershipPoolAccount do
+  subject { create :membership_pool_account }
+
+  it { is_expected.to belong_to :membership_pool }
+  it { is_expected.to belong_to :account }
+
+  it do
+    is_expected.to \
+      validate_presence_of(:membership_pool)
+      .with_message(:required)
+  end
+
+  it do
+    is_expected.to \
+      validate_presence_of(:account)
+      .with_message(:required)
+  end
+
+  it do
+    is_expected.to \
+      validate_uniqueness_of(:account_id)
+      .scoped_to(:membership_pool_id)
+  end
+end

spec/models/membership_pool_spec.rb

@@ -17,5 +17,17 @@ RSpec.describe MembershipPool do
       .through(:membership_pool_apps)
   end
 
+  it do
+    is_expected.to \
+      have_many(:membership_pool_accounts)
+      .dependent(:restrict_with_exception)
+  end
+
+  it do
+    is_expected.to \
+      have_many(:accounts)
+      .through(:membership_pool_accounts)
+  end
+
   it { is_expected.to validate_presence_of :name }
 end