If a workout was tracked with a hear rate monitor heart rate graph will be selected by default, and average bpm will be rendered as well

app.py

@@ -299,6 +299,7 @@ def get_workouts_for_user(user_id):
     for workout in workouts:
         cadence_readings = CadenceReading.query.filter_by(
             workout_id=workout.id).all()
+
         if cadence_readings:
             start_time = min(
                 reading.created_at for reading in cadence_readings)
@@ -309,6 +310,18 @@ def get_workouts_for_user(user_id):
                 reading.rpm for reading in cadence_readings) / len(cadence_readings)
             calories = cadence_readings[-1].calories
             distance = cadence_readings[-1].distance
+
+            selected_graph_types = ['speed']
+            is_heart_rate_available = False
+            heart_rate_readings = HeartRateReading.query.filter_by(
+                workout_id=workout.id).all()
+            average_bpm = 0
+            if heart_rate_readings:
+                selected_graph_types.append('heart_rate')
+                is_heart_rate_available = True
+                average_bpm = sum(heartrate.bpm for heartrate in heart_rate_readings) / \
+                    len(heart_rate_readings)
+
             workouts_data.append({
                 'id': workout.id,
                 'user_id': user_id,
@@ -319,7 +332,10 @@ def get_workouts_for_user(user_id):
                 'average_rpm': int(average_rpm),
                 'calories': int(calories),
                 'distance': int(distance),
-                'bike_display_name': workout.bike.display_name
+                'bike_display_name': workout.bike.display_name,
+                'selected_graph_types': selected_graph_types,
+                'is_heart_rate_available': is_heart_rate_available,
+                'average_bpm': int(average_bpm)
             })
     return workouts_data