feat: add exchange rate config page

app/apps/currencies/forms.py

@@ -6,7 +6,8 @@ from django.forms import CharField
 from django.utils.translation import gettext_lazy as _
 
 from apps.common.widgets.crispy.submit import NoClassSubmit
-from apps.currencies.models import Currency
+from apps.common.widgets.decimal import ArbitraryDecimalDisplayNumberInput
+from apps.currencies.models import Currency, ExchangeRate
 
 
 class CurrencyForm(forms.ModelForm):
@@ -43,3 +44,42 @@ class CurrencyForm(forms.ModelForm):
                     ),
                 ),
             )
+
+
+class ExchangeRateForm(forms.ModelForm):
+    date = forms.DateTimeField(
+        widget=forms.DateTimeInput(
+            attrs={"type": "datetime-local"}, format="%Y-%m-%dT%H:%M"
+        )
+    )
+
+    class Meta:
+        model = ExchangeRate
+        fields = ["from_currency", "to_currency", "rate", "date"]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.helper = FormHelper()
+        self.helper.form_tag = False
+        self.helper.form_method = "post"
+        self.helper.layout = Layout("date", "from_currency", "to_currency", "rate")
+
+        self.fields["rate"].widget = ArbitraryDecimalDisplayNumberInput()
+
+        if self.instance and self.instance.pk:
+            self.helper.layout.append(
+                FormActions(
+                    NoClassSubmit(
+                        "submit", _("Update"), css_class="btn btn-outline-primary w-100"
+                    ),
+                ),
+            )
+        else:
+            self.helper.layout.append(
+                FormActions(
+                    NoClassSubmit(
+                        "submit", _("Add"), css_class="btn btn-outline-primary w-100"
+                    ),
+                ),
+            )