add monthly rainfalls

app/Http/Controllers/RainfallController.php

@@ -110,4 +110,27 @@ class RainfallController extends Controller
 
         return response()->json(array_values($results));
     }
+
+    public function lastMonths(Request $request)
+    {
+        $result = [];
+        for ($i = 12; $i >= 0; $i--) {
+            $date = now()->subMonths($i);
+            $firstOfMonth = now()->subMonths($i)->firstOfMonth();
+            $lastOfMonth = now()->subMonths($i)->lastOfMonth();
+            $rainfalls = $request->user()
+                ->rainfalls()
+                ->whereBetween('date', [$firstOfMonth, $lastOfMonth])
+                ->sum('value');
+
+            $result[] = [
+                'year' => $date->year,
+                'month' => $date->month,
+                'label' => $date->monthName.' '.$date->year,
+                'values' => (int) $rainfalls,
+            ];
+        }
+
+        return response()->json($result);
+    }
 }