first commit

src-backend/workouts/serializers.py

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+from rest_framework import serializers
+from .models import Workout
+
+
+class WorkoutSerializer(serializers.ModelSerializer):
+    def validate(self, data):
+        if data.get('sport_type') == 'Steps' and not data.get('steps'):
+            raise serializers.ValidationError({'steps': 'Steps field is required when sport type is Steps'})
+        return data
+
+    class Meta:
+        model = Workout
+        fields = ['id', 'sport_type', 'start_datetime', 'duration', 'duration_seconds', 'intensity_category', 'kcal', 'distance', 'steps', 'strava_id']
+        read_only_fields = ['id', 'duration_seconds', 'strava_id'] #'duration_seconds',