Fix cascade sur modimpl/abs

app/models/absences.py

@@ -24,10 +24,8 @@ class Absence(db.Model):
     # moduleimpid concerne (optionnel):
     moduleimpl_id = db.Column(
         db.Integer,
-        db.ForeignKey("notes_moduleimpl.id"),
+        db.ForeignKey("notes_moduleimpl.id", ondelete="SET NULL"),
     )
-    # XXX TODO: contrainte ajoutée: vérifier suppression du module
-    # (mettre à NULL sans supprimer)
 
     def to_dict(self):
         data = {

migrations/versions/6520faf67508_fix_cascade_abs_mod.py

@@ -0,0 +1,43 @@
+"""fix_cascade_abs_mod
+
+Revision ID: 6520faf67508
+Revises: 19a608ebc9b7
+Create Date: 2023-03-15 19:07:15.152610
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "6520faf67508"
+down_revision = "19a608ebc9b7"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("absences_moduleimpl_id_fkey", "absences", type_="foreignkey")
+    op.create_foreign_key(
+        "absences_moduleimpl_id_fkey",
+        "absences",
+        "notes_moduleimpl",
+        ["moduleimpl_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("absences_moduleimpl_id_fkey", "absences", type_="foreignkey")
+    op.create_foreign_key(
+        "absences_moduleimpl_id_fkey",
+        "absences",
+        "notes_moduleimpl",
+        ["moduleimpl_id"],
+        ["id"],
+    )
+    # ### end Alembic commands ###