From 98a7494b6f930490e62cfc134f23d69b32203977 Mon Sep 17 00:00:00 2001
From: Alban Gruin
Date: Thu, 26 Jan 2017 13:45:24 +0100
Subject: Fonction pour récupérer l'année et la semaine d'un cours directement
 depuis le manager Utilise la méthode la plus adaptée en fonction du SGBD
 (pgsql: utilisation de extract, autre: rawsql)

---
 models.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/models.py b/models.py
index 62274d2..64fb675 100644
--- a/models.py
+++ b/models.py
@@ -1,6 +1,7 @@
-from django.db import models
+from django.db import connection, models
 from django.db.models import Q
-from django.db.models.functions import Extract
+from django.db.models.expressions import RawSQL
+from django.db.models.functions import Extract, ExtractYear
 from django.utils.text import slugify
 
 import hashlib
@@ -111,9 +112,23 @@ class Room(models.Model):
 
 
 class CourseManager(models.Manager):
+    def __get_weeks(self, qs):
+        extractYear = ExtractYear("begin")
+
+        if connection.vendor == "postgresql":
+            return qs.annotate(week=ExtractWeek("begin"), year=extractYear)
+        else:
+            return qs.annotate(week=RawSQL("""cast(strftime("%%W", "begin") as integer)""", []), year=extractYear)
+
     def get_courses_for_group(self, group, **filters):
         return self.get_queryset().filter(Q(groups__td__isnull=True) | Q(groups__td=group.td), Q(groups__tp__isnull=True) | Q(groups__tp=group.tp), groups__mention=group.mention, groups__subgroup=group.subgroup, **filters).order_by("begin")
 
+    def get_weeks(self):
+        return self.__get_weeks(self.get_queryset())
+
+    def get_courses_for_group_and_weeks(self, group, **filters):
+        qs = self.get_courses_for_group(group, **filters)
+        return self.__get_weeks(qs)
 
 class Course(models.Model):
     objects = CourseManager()
-- 
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