Integrate money-rails gem (#268)

* Integrate money-rails gem

* Fix Lint issues

* Basic test for monetize feature

* Merge main branch

* Changes to monetize balance field

---------

Co-authored-by: Zach Gollwitzer <zach.gollwitzer@gmail.com>

Gemfile

@@ -27,6 +27,7 @@ gem "bcrypt", "~> 3.1.7"
 gem "inline_svg"
 gem "jbuilder"
 gem "tzinfo-data", platforms: %i[ windows jruby ]
+gem "money-rails", "~> 1.12"
 
 group :development, :test do
   gem "debug", platforms: %i[ mri windows ]

Gemfile.lock

@@ -202,6 +202,15 @@ GEM
     matrix (0.4.2)
     mini_mime (1.1.5)
     minitest (5.21.2)
+    monetize (1.13.0)
+      money (~> 6.12)
+    money (6.16.0)
+      i18n (>= 0.6.4, <= 2)
+    money-rails (1.15.0)
+      activesupport (>= 3.0)
+      monetize (~> 1.9)
+      money (~> 6.13)
+      railties (>= 3.0)
     msgpack (1.7.2)
     net-imap (0.4.10)
       date
@@ -382,6 +391,7 @@ DEPENDENCIES
   inline_svg
   jbuilder
   letter_opener
+  money-rails (~> 1.12)
   pg (~> 1.1)
   propshaft
   puma (>= 5.0)

app/controllers/accounts_controller.rb

@@ -30,7 +30,7 @@ class AccountsController < ApplicationController
   private
 
   def account_params
-    params.require(:account).permit(:name, :accountable_type, :balance, :subtype)
+    params.require(:account).permit(:name, :accountable_type, :balance, :balance_cents, :subtype)
   end
 
   def account_type_class

app/models/account.rb

@@ -4,4 +4,6 @@ class Account < ApplicationRecord
   delegated_type :accountable, types: %w[ Account::Credit Account::Depository Account::Investment Account::Loan Account::OtherAsset Account::OtherLiability Account::Property Account::Vehicle], dependent: :destroy
 
   delegate :type_name, to: :accountable
+
+  monetize :balance_cents
 end

app/views/accounts/index.html.erb

@@ -11,7 +11,7 @@
         <%= account.accountable %>
       </div>
       <p class="text-sm text-right">
-        <span class="block mb-1"><%= number_to_currency account.balance %></span>
+        <span class="block mb-1"><%= humanized_money_with_symbol account.balance %></span>
       </p>
     </div>
 <% end %>

app/views/accounts/new.html.erb

@@ -33,7 +33,7 @@
     <div class="relative p-4 border border-gray-100 bg-offwhite rounded-xl focus-within:bg-white focus-within:shadow focus-within:opacity-100">
       <label for="account_balance" class="block text-sm font-medium opacity-50 focus-within:opacity-100">Balance</label>
       <div class="flex">
-        <%= f.number_field :balance, placeholder: "$0.00", in: 0.00..100000000.00, required: 'required', class: "p-0 mt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100" %>
+        <%= f.number_field :balance, placeholder: "$0.00", in: 0.00..100000000.00, step: :any, required: 'required', class: "p-0 mt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100" %>
       </div>
     </div>
 

app/views/layouts/application.html.erb

@@ -70,7 +70,7 @@
                   <%= account.name %>
                 </div>
                 <p class="text-sm text-right">
-                  <span class="block mb-1"><%= number_to_currency account.balance %></span>
+                  <span class="block mb-1"><%= humanized_money_with_symbol account.balance  %></span>
                 </p>
               </div>
             <% end %>

config/initializers/money.rb

@@ -0,0 +1,114 @@
+# encoding : utf-8
+
+MoneyRails.configure do |config|
+  # To set the default currency
+  #
+  config.default_currency = :usd
+
+  # Set default bank object
+  #
+  # Example:
+  # config.default_bank = EuCentralBank.new
+
+  # Add exchange rates to current money bank object.
+  # (The conversion rate refers to one direction only)
+  #
+  # Example:
+  # config.add_rate "USD", "CAD", 1.24515
+  # config.add_rate "CAD", "USD", 0.803115
+
+  # To handle the inclusion of validations for monetized fields
+  # The default value is true
+  #
+  # config.include_validations = true
+
+  # Default ActiveRecord migration configuration values for columns:
+  #
+  # config.amount_column = { prefix: '',           # column name prefix
+  #                          postfix: '_cents',    # column name  postfix
+  #                          column_name: nil,     # full column name (overrides prefix, postfix and accessor name)
+  #                          type: :integer,       # column type
+  #                          present: true,        # column will be created
+  #                          null: false,          # other options will be treated as column options
+  #                          default: 0
+  #                        }
+  #
+  # config.currency_column = { prefix: '',
+  #                            postfix: '_currency',
+  #                            column_name: nil,
+  #                            type: :string,
+  #                            present: true,
+  #                            null: false,
+  #                            default: 'USD'
+  #                          }
+
+  # Register a custom currency
+  #
+  # Example:
+  # config.register_currency = {
+  #   priority:            1,
+  #   iso_code:            "EU4",
+  #   name:                "Euro with subunit of 4 digits",
+  #   symbol:              "€",
+  #   symbol_first:        true,
+  #   subunit:             "Subcent",
+  #   subunit_to_unit:     10000,
+  #   thousands_separator: ".",
+  #   decimal_mark:        ","
+  # }
+
+  # Specify a rounding mode
+  # Any one of:
+  #
+  # BigDecimal::ROUND_UP,
+  # BigDecimal::ROUND_DOWN,
+  # BigDecimal::ROUND_HALF_UP,
+  # BigDecimal::ROUND_HALF_DOWN,
+  # BigDecimal::ROUND_HALF_EVEN,
+  # BigDecimal::ROUND_CEILING,
+  # BigDecimal::ROUND_FLOOR
+  #
+  # set to BigDecimal::ROUND_HALF_EVEN by default
+  #
+  config.rounding_mode = BigDecimal::ROUND_HALF_UP
+
+  # Set default money format globally.
+  # Default value is nil meaning "ignore this option".
+  # Example:
+  #
+  # config.default_format = {
+  #   no_cents_if_whole: nil,
+  #   symbol: nil,
+  #   sign_before_symbol: nil
+  # }
+
+  # If you would like to use I18n localization (formatting depends on the
+  # locale):
+  config.locale_backend = :i18n
+  #
+  # Example (using default localization from rails-i18n):
+  #
+  # I18n.locale = :en
+  # Money.new(10_000_00, 'USD').format # => $10,000.00
+  # I18n.locale = :es
+  # Money.new(10_000_00, 'USD').format # => $10.000,00
+  #
+  # For the legacy behaviour of "per currency" localization (formatting depends
+  # only on currency):
+  # config.locale_backend = :currency
+  #
+  # Example:
+  # Money.new(10_000_00, 'USD').format # => $10,000.00
+  # Money.new(10_000_00, 'EUR').format # => €10.000,00
+  #
+  # In case you don't need localization and would like to use default values
+  # (can be redefined using config.default_format):
+  # config.locale_backend = nil
+
+  # Set default raise_error_on_money_parsing option
+  # It will be raise error if assigned different currency
+  # The default value is false
+  #
+  # Example:
+  # config.raise_error_on_money_parsing = false
+end

db/migrate/20240206031739_replace_money_field.rb

@@ -0,0 +1,14 @@
+class ReplaceMoneyField < ActiveRecord::Migration[7.2]
+  def change
+    add_monetize :accounts, :balance
+    change_column :accounts, :balance_cents, :integer, limit: 8
+
+    Account.reset_column_information
+
+    Account.find_each do |account|
+      account.update_columns(balance_cents: Money.from_amount(account.balance, account.currency).cents)
+    end
+
+    remove_column :accounts, :balance
+  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[7.2].define(version: 2024_02_03_050018) do
+ActiveRecord::Schema[7.2].define(version: 2024_02_06_031739) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -59,12 +59,13 @@ ActiveRecord::Schema[7.2].define(version: 2024_02_03_050018) do
     t.string "subtype"
     t.uuid "family_id", null: false
     t.string "name"
-    t.bigint "balance", default: 0
     t.string "currency", default: "USD"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.string "accountable_type"
     t.uuid "accountable_id"
+    t.bigint "balance_cents", default: 0, null: false
+    t.string "balance_currency", default: "USD", null: false
     t.index ["accountable_type"], name: "index_accounts_on_accountable_type"
     t.index ["family_id"], name: "index_accounts_on_family_id"
   end

test/fixtures/accounts.yml

@@ -1,14 +1,14 @@
 dylan_checking:
   family: dylan_family
   name: Bob's Checking
-  balance: 1200
+  balance_cents: 1200
 
 dylan_roth:
   family: dylan_family
   name: Bob's Roth IRA
-  balance: 1200
+  balance_cents: 1200
 
 richards_savings:
   family: richards_family
   name: Keef's HYSA
-  balance: 1500
+  balance_cents: 1500

test/models/account_test.rb

@@ -1,11 +1,31 @@
 require "test_helper"
 
 class AccountTest < ActiveSupport::TestCase
-  test "new account should be valid" do
+  def setup
     depository = Account::Depository.create!
-    account = Account.create!(family: families(:dylan_family), name: "Explicit Checking", balance: 1200, accountable: depository)
-    assert account.valid?
-    assert_not_nil account.accountable_id
-    assert_not_nil account.accountable
+    @account = Account.create!(family: families(:dylan_family), name: "Explicit Checking", balance_cents: 1200, accountable: depository)
+  end
+
+  test "new account should be valid" do
+    assert @account.valid?
+    assert_not_nil @account.accountable_id
+    assert_not_nil @account.accountable
+  end
+
+  test "balance returns Money object" do
+    @account.balance = 10
+    assert_instance_of Money, @account.balance
+    assert_equal :usd, @account.balance.currency.id
+  end
+
+  test "correctly assigns Money objects to the attribute" do
+    @account.balance = Money.new(2500, "USD")
+    assert_equal 2500, @account.balance_cents
+  end
+
+  test "balance_cents can be updated" do
+    new_balance = Money.new(10000, "USD")
+    @account.balance = new_balance
+    assert_equal new_balance, @account.balance
   end
 end