Bénévole : vœux d'artistes (entité Artist) et vœux de postes

Nouvelle entité `Artist` (nom + jour de passage), CRUD
`/editions/{id}/artists` (lecture ouverte à tout compte de l'édition,
écriture COORDINATION), unicité (édition, nom, date).

La fiche bénévole porte deux listes de vœux, sur le modèle de
`skill_codes` (None = inchangé, [] = vider) :
- `artist_ids` : artistes que le bénévole veut voir (`volunteer_artist`) ;
- `wished_position_ids` : postes qu'il voudrait tenir
  (`volunteer_position_wish`), distinct de l'affectation.

Un id étranger à l'édition renvoie 422 (`artist.unknown` /
`position.unknown`). Suppression d'un artiste : cascade sur les vœux.
Migration 0006. Jeu de démonstration et frontend inchangés (le front
suivra).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017uUsRg7XzopkCPWimwg9ZM

backend/tests/factories.py

@@ -3,6 +3,7 @@
 import datetime as dt
 
 from app.models import (
+    Artist,
     Availability,
     AvailabilityStatus,
     Position,
@@ -22,6 +23,18 @@ def make_position(session, edition, *, name="Bar", category=PositionCategory.BAR
     return position
 
 
+def make_artist(
+    session, edition, *, name="Chilla", performance_date=dt.date(2026, 7, 10)
+):
+    artist = Artist(
+        edition_id=edition.id, name=name, performance_date=performance_date
+    )
+    session.add(artist)
+    session.commit()
+    session.refresh(artist)
+    return artist
+
+
 def make_shift(
     session, edition, position, *, start, end, min_staff=1, ideal_staff=2, skills=()
 ):

backend/tests/test_api_artists.py

@@ -0,0 +1,114 @@
+import datetime as dt
+import uuid
+
+from sqlmodel import select
+
+from app.models import Artist, Role, VolunteerArtist
+from tests.factories import make_artist, make_volunteer
+
+
+def _url(edition, suffix=""):
+    return f"/editions/{edition.id}/artists{suffix}"
+
+
+def test_create_and_list_ordered_by_date_then_name(client, edition):
+    client.post(
+        _url(edition), json={"name": "Ziak", "performance_date": "2026-07-11"}
+    )
+    client.post(
+        _url(edition), json={"name": "Aloïse Sauvage", "performance_date": "2026-07-11"}
+    )
+    r = client.post(
+        _url(edition), json={"name": "Chilla", "performance_date": "2026-07-10"}
+    )
+    assert r.status_code == 201
+
+    body = client.get(_url(edition)).json()
+    assert [(a["name"], a["performance_date"]) for a in body] == [
+        ("Chilla", "2026-07-10"),
+        ("Aloïse Sauvage", "2026-07-11"),
+        ("Ziak", "2026-07-11"),
+    ]
+
+
+def test_blank_name_is_422(client, edition):
+    r = client.post(
+        _url(edition), json={"name": "   ", "performance_date": "2026-07-10"}
+    )
+    assert r.status_code == 422
+    assert r.json()["detail"]["code"] == "artist.name_required"
+
+
+def test_duplicate_name_and_date_conflicts(client, edition):
+    payload = {"name": "Chilla", "performance_date": "2026-07-10"}
+    assert client.post(_url(edition), json=payload).status_code == 201
+    r = client.post(_url(edition), json=payload)
+    assert r.status_code == 409
+    assert r.json()["detail"]["code"] == "artist.duplicate"
+
+    # Même nom, autre jour : autorisé.
+    r2 = client.post(
+        _url(edition), json={"name": "Chilla", "performance_date": "2026-07-11"}
+    )
+    assert r2.status_code == 201
+
+
+def test_update_artist(client, edition, session):
+    artist = make_artist(session, edition, name="Chila")
+    r = client.patch(
+        _url(edition, f"/{artist.id}"),
+        json={"name": "Chilla", "performance_date": "2026-07-12"},
+    )
+    assert r.status_code == 200
+    assert r.json()["name"] == "Chilla"
+    assert r.json()["performance_date"] == "2026-07-12"
+
+
+def test_delete_artist_removes_volunteer_wishes(client, edition, session):
+    artist = make_artist(session, edition)
+    volunteer = make_volunteer(session, edition, email="fan@e.fr")
+    assert client.patch(
+        f"/editions/{edition.id}/volunteers/{volunteer.id}",
+        json={"artist_ids": [str(artist.id)]},
+    ).json()["artist_ids"] == [str(artist.id)]
+
+    assert client.delete(_url(edition, f"/{artist.id}")).status_code == 204
+    assert session.exec(select(Artist)).all() == []
+    assert session.exec(select(VolunteerArtist)).all() == []
+    fiche = client.get(
+        f"/editions/{edition.id}/volunteers/{volunteer.id}"
+    ).json()
+    assert fiche["artist_ids"] == []
+
+
+def test_unknown_edition_is_404(client):
+    assert client.get(f"/editions/{uuid.uuid4()}/artists").status_code == 404
+
+
+def test_write_is_coordinator_only(edition, make_account, as_account):
+    lead = make_account(Role.LEAD, email="lead@e.fr")
+    api = as_account(lead)
+    resp = api.post(
+        _url(edition), json={"name": "X", "performance_date": "2026-07-10"}
+    )
+    assert resp.status_code == 403
+    # La lecture reste ouverte à tout compte de l'édition.
+    assert api.get(_url(edition)).status_code == 200
+
+
+def test_other_edition_artist_is_404(client, edition, session):
+    from app.models import Edition
+
+    other = Edition(
+        year=2027,
+        start_date=dt.date(2027, 7, 1),
+        end_date=dt.date(2027, 7, 4),
+    )
+    session.add(other)
+    session.commit()
+    session.refresh(other)
+    stranger = make_artist(session, other, name="Ailleurs")
+
+    assert client.patch(
+        _url(edition, f"/{stranger.id}"), json={"name": "Y"}
+    ).status_code == 404

backend/tests/test_api_volunteers.py

@@ -1,10 +1,12 @@
 import datetime as dt
+import uuid
 
 from sqlmodel import select
 
 from app.models import Assignment, Availability, AvailabilityStatus, Volunteer
 from tests.factories import (
     dt_at,
+    make_artist,
     make_availability,
     make_position,
     make_shift,
@@ -56,8 +58,6 @@ def test_list_is_ordered_by_name(client, edition, session):
 
 
 def test_get_unknown_id_is_404(client, edition):
-    import uuid
-
     assert client.get(_url(edition, f"/{uuid.uuid4()}")).status_code == 404
 
 
@@ -77,6 +77,60 @@ def test_get_volunteer_of_another_edition_is_404(client, edition, session):
     assert client.get(_url(edition, f"/{stranger.id}")).status_code == 404
 
 
+def test_create_with_artist_and_position_wishes(client, edition, session):
+    artist = make_artist(session, edition)
+    position = make_position(session, edition)
+    resp = client.post(
+        _url(edition),
+        json={
+            "first_name": "Fan",
+            "last_name": "Zele",
+            "artist_ids": [str(artist.id)],
+            "wished_position_ids": [str(position.id)],
+        },
+    )
+    assert resp.status_code == 201
+    body = resp.json()
+    assert body["artist_ids"] == [str(artist.id)]
+    assert body["wished_position_ids"] == [str(position.id)]
+
+
+def test_unknown_artist_wish_is_422(client, edition):
+    resp = client.post(
+        _url(edition),
+        json={
+            "first_name": "A",
+            "last_name": "B",
+            "artist_ids": [str(uuid.uuid4())],
+        },
+    )
+    assert resp.status_code == 422
+    assert resp.json()["detail"]["code"] == "artist.unknown"
+
+
+def test_patch_replaces_and_clears_wishes(client, edition, session):
+    a1 = make_artist(session, edition, name="A1")
+    a2 = make_artist(session, edition, name="A2")
+    volunteer = make_volunteer(session, edition, email="w@ex.fr")
+
+    r1 = client.patch(
+        _url(edition, f"/{volunteer.id}"),
+        json={"artist_ids": [str(a2.id), str(a1.id), str(a2.id)]},
+    )
+    # Doublons retirés, tri par (date, nom).
+    assert r1.json()["artist_ids"] == [str(a1.id), str(a2.id)]
+
+    r2 = client.patch(
+        _url(edition, f"/{volunteer.id}"), json={"artist_ids": []}
+    )
+    assert r2.json()["artist_ids"] == []
+    # Champ absent = inchangé.
+    r3 = client.patch(
+        _url(edition, f"/{volunteer.id}"), json={"first_name": "Zoe"}
+    )
+    assert r3.json()["artist_ids"] == []
+
+
 def test_patch_replaces_skills_and_can_clear(client, edition, session):
     volunteer = make_volunteer(session, edition, email="p@ex.fr")
     r1 = client.patch(

backend/tests/test_models.py

@@ -22,8 +22,11 @@ EXPECTED_TABLES = {
     "edition",
     "day_part",
     "skill",
+    "artist",
     "volunteer",
     "volunteer_skill",
+    "volunteer_artist",
+    "volunteer_position_wish",
     "account",
     "magic_link_token",
     "position",