feature(backend): Add compute functions and utils to get stats about contributions

backend/stats_app/compute_stats.py

 from datetime import timedelta
+from collections import Counter
+from backend_app.models.university import University
 
-from stats_app.models import DailyConnections
-from stats_app.utils import get_daily_connections, get_today_as_datetime
+
+from stats_app.models import DailyConnections, DailyExchangeContributionsInfo
+from stats_app.utils import (
+    get_daily_connections,
+    get_today_as_datetime,
+    get_contributions_profiles,
+)
 
 
 def update_daily_connections():
@@ -11,5 +18,24 @@ def update_daily_connections():
     )
 
 
+def update_daily_exchange_contributions_info():
+    yesterday = get_today_as_datetime() - timedelta(days=1)
+
+    contributions_profiles = get_contributions_profiles()
+
+    nb_contributions_by_profile = Counter(contributions_profiles)
+    for contribution_profile, nb_contributions in nb_contributions_by_profile.items():
+        university = University.objects.get(pk=contribution_profile.university_pk)
+        DailyExchangeContributionsInfo.objects.update_or_create(
+            date=yesterday,
+            major=contribution_profile.major,
+            minor=contribution_profile.minor,
+            exchange_semester=contribution_profile.exchange_semester,
+            university=university,
+            defaults=dict(nb_contributions=nb_contributions),
+        )
+
+
 def update_all_stats():
     update_daily_connections()
+    update_daily_exchange_contributions_info()

backend/stats_app/utils.py

 from datetime import datetime, timedelta
 from django.utils.timezone import make_aware
+from dataclasses import dataclass
+from typing import List
 
 from base_app.models import User
 
+from backend_app.models.exchangeFeedback import ExchangeFeedback
+from backend_app.models.courseFeedback import CourseFeedback
+from backend_app.models.exchange import Exchange
+
 
 def get_today_as_datetime():
     now = datetime.now()
@@ -17,3 +23,60 @@ def get_daily_connections() -> int:
         last_login__gte=yesterday, last_login__lt=today
     ).count()
     return nb_connections
+
+
+@dataclass(eq=True, frozen=True)
+class ContributionProfile:
+    """
+    Class for keeping track a profile.
+    """
+
+    major: str
+    minor: str
+    exchange_semester: str
+    university_pk: int
+
+
+def _get_profile_from_exchange(exchange: Exchange) -> ContributionProfile:
+    return ContributionProfile(
+        major=exchange.student_major if exchange.student_major is not None else "",
+        minor=exchange.student_minor if exchange.student_minor is not None else "",
+        exchange_semester=f"{exchange.semester}{exchange.year}",
+        university_pk=exchange.university.pk,
+    )
+
+
+def get_contributions_profiles() -> List[ContributionProfile]:
+    """
+    return the yesterday contributions profiles
+
+    If no university if associated with a contribution we don't return it
+    """
+    today = get_today_as_datetime()
+    yesterday = today - timedelta(days=1)
+    contributions_profiles = []
+
+    exchange_feedbacks = ExchangeFeedback.objects.filter(
+        updated_on__gte=yesterday,
+        updated_on__lt=today,
+        exchange__university__isnull=False,
+        untouched=False,
+    ).prefetch_related("exchange")
+
+    for exchange_feedback in exchange_feedbacks:
+        exchange = exchange_feedback.exchange
+        contribution_profile = _get_profile_from_exchange(exchange)
+        contributions_profiles.append(contribution_profile)
+
+    course_feedbacks = CourseFeedback.objects.filter(
+        updated_on__gte=yesterday,
+        updated_on__lt=today,
+        course__exchange__university__isnull=False,
+        untouched=False,
+    ).prefetch_related("course__exchange")
+    for course_feedback in course_feedbacks:
+        exchange = course_feedback.course.exchange
+        contribution_profile = _get_profile_from_exchange(exchange)
+        contributions_profiles.append(contribution_profile)
+
+    return contributions_profiles