Adjust formatting rules to use i18n translations for :format

AUTHORS

@@ -30,6 +30,7 @@ Dave Kroondyk
 Diego Aguir Selzlein
 Doug Droper
 Douglas Miller
+Drew Bragg
 Ed Saunders
 Edwin Vlieg
 Eloy

CHANGELOG.md

@@ -20,6 +20,7 @@
 - **Potential breaking change**: Fix USDC decimals places from 2 to 6
 - **Potential breaking change**: Fix MGA (Malagasy Ariary) to be a zero-decimal currency (changing subunit_to_unit from 5 to 1)
 - **Potential breaking change**: Remove special handling for Japanese language only
+- **Potential breaking change**: Adjust formatting rules to use i18n translations for `:format`
 - Updated Armenian Dram sign and HTML entity
 - Updated the Turkmen Manat symbol and HTML entity and added disambiguation symbol for TMM
 - Expose Money::VERSION

lib/money/locale_backend/i18n.rb

@@ -8,7 +8,8 @@ class I18n < Base
       KEY_MAP = {
         thousands_separator: :delimiter,
         decimal_mark: :separator,
-        symbol: :unit
+        symbol: :unit,
+        format: :format,
       }.freeze
 
       def initialize

lib/money/money/formatting_rules.rb

@@ -10,7 +10,7 @@ def initialize(currency, *raw_rules)
 
       @rules = default_formatting_rules.merge(@rules) unless @rules[:ignore_defaults]
       @rules = translate_formatting_rules(@rules) if @rules[:translate]
-      @rules[:format] ||= determine_format_from_formatting_rules(@rules)
+      @rules[:format] ||= determine_format
       @rules[:delimiter_pattern] ||= delimiter_pattern_rule(@rules)
     end
 
@@ -68,7 +68,11 @@ def translate_formatting_rules(rules)
       rules
     end
 
-    def determine_format_from_formatting_rules(rules)
+    def determine_format
+      Money.locale_backend&.lookup(:format, @currency) || default_format
+    end
+
+    def default_format
       if currency.format
         currency.format
       else

spec/locale_backend/currency_spec.rb

@@ -11,5 +11,9 @@
     it 'returns decimal_mark based as defined in currency' do
       expect(subject.lookup(:decimal_mark, currency)).to eq(',')
     end
+
+    it 'returns format based as defined in currency' do
+      expect(subject.lookup(:format, currency)).to eq(nil)
+    end
   end
 end

spec/locale_backend/i18n_spec.rb

@@ -21,7 +21,7 @@
       before do
         I18n.locale = :de
         I18n.backend.store_translations(:de, number: {
-          currency: { format: { delimiter: '.', separator: ',', unit: '$' } }
+          currency: { format: { delimiter: '.', separator: ',', unit: '$', format: '%u%n' } }
         })
       end
 
@@ -36,6 +36,10 @@
       it 'returns symbol based on the current locale' do
         expect(subject.lookup(:symbol, nil)).to eq('$')
       end
+
+      it 'returns format based on the current locale' do
+        expect(subject.lookup(:format, nil)).to eq('%u%n')
+      end
     end
 
     context 'with number.format defined' do
@@ -65,6 +69,10 @@
       it 'returns symbol based on the current locale' do
         expect(subject.lookup(:symbol, nil)).to eq(nil)
       end
+
+      it 'returns format based on the current locale' do
+        expect(subject.lookup(:format, nil)).to eq(nil)
+      end
     end
   end
 end

spec/money/formatting_rules_spec.rb

@@ -14,4 +14,47 @@
     expect(rules).to eq(separator: '.')
     expect(rules).not_to eq(new_rules)
   end
+
+  describe 'format' do
+    context 'when there is a locale backend' do
+      it 'returns the format from the passed rules' do
+        currency = Money::Currency.new('EUR')
+        rules = { format: '%n%u', separator: '.', delimiter: ',' }
+
+        expect(Money::FormattingRules.new(currency, rules)[:format]).to eq('%n%u')
+      end
+
+      it 'returns the translated format for the locale' do
+        I18n.backend.store_translations(:fr, number: {
+          currency: { format: { format: "%n %u" } }
+        })
+        currency = Money::Currency.new('EUR')
+        rules = { separator: '.', delimiter: ',' }
+
+        expect(I18n.with_locale(:fr) { Money::FormattingRules.new(currency, rules)[:format] }).to eq('%n %u')
+      end
+    end
+
+    context 'when there is no locale backend' do
+      it 'returns the format from the passed rules' do
+        allow(Money).to receive(:locale_backend).and_return(nil)
+        currency = Money::Currency.new('EUR')
+        rules = { format: '%n%u', separator: '.', delimiter: ',' }
+
+        expect(Money::FormattingRules.new(currency, rules)[:format]).to eq('%n%u')
+      end
+
+      it 'returns the default format for the locale' do
+        allow(Money).to receive(:locale_backend).and_return(nil)
+        I18n.backend.store_translations(:fr, number: {
+          currency: { format: { format: "%n %u" } }
+        })
+        currency = Money::Currency.new('EUR')
+        rules = { separator: '.', delimiter: ',' }
+        allow(currency).to receive(:format).and_return("%u%n")
+
+        expect(I18n.with_locale(:fr) { Money::FormattingRules.new(currency, rules)[:format] }).to eq('%u%n')
+      end
+    end
+  end
 end