From 80bfef3b090d3a9741bdb2da71b9ac4ee9cf7a43 Mon Sep 17 00:00:00 2001
From: Zane Wolfgang Pickett <sirwolfgang@users.noreply.github.com>
Date: Wed, 24 Apr 2024 21:14:07 +0200
Subject: [PATCH] Allow nil to be set as default currency

---
 Gemfile                                |  2 +-
 lib/money-rails/configuration.rb       |  4 ++--
 spec/active_record/monetizable_spec.rb | 19 +++++++++++++++++++
 spec/dummy/app/models/other_product.rb |  3 +++
 4 files changed, 25 insertions(+), 3 deletions(-)
 create mode 100644 spec/dummy/app/models/other_product.rb

diff --git a/Gemfile b/Gemfile
index ebddec7259..e77017e3fb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ platforms :jruby do
 end
 
 platforms :ruby do
-  gem "sqlite3"
+  gem "sqlite3", '~> 1.4'
 end
 
 platform :mri do
diff --git a/lib/money-rails/configuration.rb b/lib/money-rails/configuration.rb
index 129dba97f9..347ae4fc87 100644
--- a/lib/money-rails/configuration.rb
+++ b/lib/money-rails/configuration.rb
@@ -20,7 +20,7 @@ def configure
     # Configuration parameters
 
     def default_currency
-      Money::Currency.new(Money.default_currency)
+      Money::Currency.new(Money.default_currency) if Money.default_currency
     end
 
     # Set default currency of money library
@@ -35,7 +35,7 @@ def register_currency=(currency_options)
     end
 
     def set_currency_column_for_default_currency!
-      iso_code = default_currency.iso_code
+      iso_code = default_currency&.iso_code
       currency_column.merge! default: iso_code
     end
 
diff --git a/spec/active_record/monetizable_spec.rb b/spec/active_record/monetizable_spec.rb
index 85dd378fbe..dcc9ee9e39 100644
--- a/spec/active_record/monetizable_spec.rb
+++ b/spec/active_record/monetizable_spec.rb
@@ -949,6 +949,25 @@ class SubProduct < Product
         expect(price.amount).not_to eq(value.amount)
       end
 
+      context 'without a default currency' do
+        let(:product) { OtherProduct.new }
+
+        around do |example|
+          default_currency = Money.default_currency
+          Money.default_currency = nil
+
+          example.run
+
+          Money.default_currency = default_currency
+        end
+
+        it "errors when" do
+          expect do
+            product.write_monetized :price, :price_cents, 10.5, false, nil, {}
+          end.to raise_error(Money::Currency::NoCurrency)
+        end
+      end
+
       describe "instance_currency_name" do
         it "updates instance_currency_name attribute" do
           product.write_monetized :sale_price, :sale_price_amount, value, false, :sale_price_currency_code, {}
diff --git a/spec/dummy/app/models/other_product.rb b/spec/dummy/app/models/other_product.rb
new file mode 100644
index 0000000000..574c71e8c5
--- /dev/null
+++ b/spec/dummy/app/models/other_product.rb
@@ -0,0 +1,3 @@
+class OtherProduct < ActiveRecord::Base
+  monetize :price_cents
+end