We store amounts in cents but users enter euros

apps/note/templatetags/pretty_money.py

@@ -18,5 +18,10 @@ def pretty_money(value):
         )
 
 
+def cents_to_euros(value):
+    return "{:.02f}".format(value / 100) if value else ""
+
+
 register = template.Library()
 register.filter('pretty_money', pretty_money)
+register.filter('cents_to_euros', cents_to_euros)

apps/treasury/views.py

@@ -44,7 +44,15 @@ class BillingCreateView(LoginRequiredMixin, CreateView):
     def form_valid(self, form):
         ret = super().form_valid(form)
 
-        formset = ProductFormSet(self.request.POST, instance=form.instance)
+        kwargs = {}
+        for key in self.request.POST:
+            value = self.request.POST[key]
+            if key.endswith("amount"):
+                kwargs[key] = str(int(100 * float(value)))
+            else:
+                kwargs[key] = value
+
+        formset = ProductFormSet(kwargs, instance=form.instance)
         if formset.is_valid():
             for f in formset:
                 if f.is_valid() and f.instance.designation:
@@ -89,8 +97,17 @@ class BillingUpdateView(LoginRequiredMixin, UpdateView):
     def form_valid(self, form):
         ret = super().form_valid(form)
 
-        formset = ProductFormSet(self.request.POST, instance=form.instance)
+        kwargs = {}
+        for key in self.request.POST:
+            value = self.request.POST[key]
+            if key.endswith("amount"):
+                kwargs[key] = str(int(100 * float(value)))
+            else:
+                kwargs[key] = value
+
+        formset = ProductFormSet(kwargs, instance=form.instance)
         saved = []
+        print(formset.errors)
         if formset.is_valid():
             for f in formset:
                 if f.is_valid() and f.instance.designation:

templates/treasury/billing_form.html

@@ -1,10 +1,10 @@
 {% extends "base.html" %}
 {% load static %}
 {% load i18n %}
-{% load crispy_forms_tags %}
+{% load crispy_forms_tags pretty_money %}
 {% block content %}
     <p><a class="btn btn-default" href="{% url 'treasury:billing' %}">{% trans "Billings list" %}</a></p>
-    <form method="post" action="" class="form-horizontal">
+    <form method="post" action="">
         {% csrf_token %}
         {% crispy form %}
         {{ formset.management_form }}
@@ -21,7 +21,16 @@
                   <tr class="row-formset">
                     <td>{{ form.designation }}</td>
                     <td>{{ form.quantity }} </td>
-                    <td>{{ form.amount }}</td>
+                    <td>
+                        <div class="input-group">
+                            <input type="number" name="product_set-{{ forloop.counter0 }}-amount" min="0" step="0.01"
+                                   id="id_product_set-{{ forloop.counter0 }}-amount"
+                                   value="{{ form.instance.amount|cents_to_euros }}">
+                            <div class="input-group-append">
+                                <span class="input-group-text">€</span>
+                            </div>
+                        </div>
+                    </td>
                     {{ form.billing }}
                     {{ form.id }}
                  </tr>
@@ -45,7 +54,15 @@
                 <tr class="row-formset">
                     <td>{{ formset.empty_form.designation }}</td>
                     <td>{{ formset.empty_form.quantity }} </td>
-                    <td>{{ formset.empty_form.amount }}</td>
+                    <td>
+                        <div class="input-group">
+                            <input type="number" name="product_set-__prefix__-amount" min="0" step="0.01"
+                                   id="id_product_set-__prefix__-amount">
+                            <div class="input-group-append">
+                                <span class="input-group-text">€</span>
+                            </div>
+                        </div>
+                    </td>
                     {{ formset.empty_form.billing }}
                     {{ formset.empty_form.id }}
                 </tr>