Refactor view code

expenses_manager/expenses/views.py

@@ -1,4 +1,5 @@
 from datetime import date
+from re import M
 from .models import Expense
 from .forms import ExpenseForm
 
@@ -25,7 +26,7 @@ MONTHS = {
     12:'DICIEMBRE'
 }
 
-def get_int(value):
+def _get_int(value):
     try:
         return int(value)
     except (TypeError, ValueError):
@@ -105,25 +106,30 @@ def expense_delete(request, pk):
 
 @login_required
 def dashboard(request):        
+    # ------------------
+    # Filters
+    # ------------------
+    year = _get_int(request.GET.get('year'))
+    month = _get_int(request.GET.get('month'))
     
-    expenses = Expense.objects.filter(owner=request.user)
+    current_year = date.today().year
-    
-    # Apply filters by year and month
-    year = get_int(request.GET.get('year'))
-    month = get_int(request.GET.get('month'))
-    
-    current_year = date.today()
     
     selected_year = year or current_year
     selected_month = month
     
+    # ------------------
+    # Queryset base
+    # -----------------
+    expenses = Expense.objects.filter(owner=request.user)
+    
     expenses_filtered = expenses.filter(date__year=selected_year)
 
     if selected_month:
         expenses_filtered = expenses_filtered.filter(date__month=selected_month)  
 
-    # Querysets
+    # ------------------
-    # By Category
+    # Totals by category
+    # -----------------
     by_category = (
         expenses_filtered
         .values('category__name')
@@ -131,6 +137,10 @@ def dashboard(request):
         .order_by('category__name')
     )
 
+    # ------------------
+    # Totals by month
+    # -----------------
+
     by_month_qs = (
         expenses_filtered        
         .annotate(month=ExtractMonth('date'))
@@ -138,30 +148,36 @@ def dashboard(request):
         .annotate(total=Sum('amount'))
     )
     
+    month_totals = {
+        row['month']: float(row['total'])
+        for row in by_month_qs
+    }
+    
+    months = list(range(1, 13))
+    
     by_month = [
         {
-            'month': MONTHS[row['month']],
+            'month': m,
-            'total': row['total'],
+            'total': month_totals.get(m, 0),
         }
-        for row in by_month_qs
+        for m in months
     ]
     
+    # ------------------
+    # Availables years
+    # -----------------
+    
     year_list = (
         expenses
         .annotate(year=ExtractYear('date'))
-        .values_list('year', float=True)
+        .values_list('year', flat=True)
         .distinct()
         .order_by('year')
     )
-    # Month list
-    months = list(range(1, 13))
     
     # Prepare data fot ploting in chart
-    chart_labels = []
+    chart_labels = months
-    chart_totals = []
+    chart_totals = [row['total'] for row in by_month]
-    for month_data in by_month:
-        chart_labels.append(month_data['month'])
-        chart_totals.append(float(month_data['total']))
     
     # Send the data to the dashboard
     return render(request, 'expenses/dashboard.html', {
@@ -170,7 +186,7 @@ def dashboard(request):
         'chart_labels': chart_labels,
         'chart_data': chart_totals,
         'year_list': year_list,
-        'selected_year': year,
-        'selected_month': month,
         'months': months,
+        'selected_year': selected_year,
+        'selected_month': selected_month,
     })