Fix FixedCurrencyMoneyInput.decompress to always return currency

Author: filipmlynarski-mirumee

django_prices/widgets.py

@@ -33,7 +33,7 @@ def __init__(self, currency, attrs=None):
     def decompress(self, value):
         if value and isinstance(value, Money):
             return [value.amount, self.currency]
-        return [None, None]
+        return [None, self.currency]
 
     def render(self, name, value, attrs=None, renderer=None):
         widget = super().render(name, value, attrs=attrs, renderer=renderer)

tests/test_forms.py

@@ -34,6 +34,21 @@ def test_render_fixed_currency_money_input():
         assert attr in result
 
 
+def test_fixed_currency_money_input_decompress_with_none():
+    """Test that decompress returns currency even when value is None."""
+    widget = widgets.FixedCurrencyMoneyInput(currency="USD")
+    # When value is None, should return [None, 'USD'] not [None, None]
+    result = widget.decompress(None)
+    assert result == [None, "USD"], "Currency should be set even when value is None"
+
+
+def test_fixed_currency_money_input_decompress_with_value():
+    """Test that decompress returns correct values when Money object is provided."""
+    widget = widgets.FixedCurrencyMoneyInput(currency="USD")
+    result = widget.decompress(Money(10, "USD"))
+    assert result == [10, "USD"], "Should return amount and currency from Money object"
+
+
 @pytest.mark.parametrize(
     "data,initial,expected_result",
     [