From 2659eb1e451b102672f4e57af977cb6e382d872b Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: Jan 17 2019 15:32:04 +0000
Subject: Cascade deleting flags when tokens are deleted


A project is deleted, if may have PRs with flags, these flags
have been added via the API via an API token (potentially linked
to the project).
When the project is deleted the API token gets deleted and the
corresponding flags should be deleted as well, which this commit
allows.

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

---

diff --git a/alembic/versions/2b1743f77436_cascade_deleting_flags_when_tokens_are_.py b/alembic/versions/2b1743f77436_cascade_deleting_flags_when_tokens_are_.py
new file mode 100644
index 0000000..1c11995
--- /dev/null
+++ b/alembic/versions/2b1743f77436_cascade_deleting_flags_when_tokens_are_.py
@@ -0,0 +1,46 @@
+"""Cascade deleting flags when tokens are deleted
+
+Revision ID: 2b1743f77436
+Revises: 5993f9240bcf
+Create Date: 2019-01-16 13:38:34.954904
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '2b1743f77436'
+down_revision = '5993f9240bcf'
+
+
+def upgrade():
+    """ Remove the existing foreign key in pull_request_flags.token_id and
+    re-create it with CASCADE on delete and update.
+    """
+    # alter the constraints
+    op.drop_constraint('pull_request_flags_token_id_fkey', 'pull_request_flags')
+    op.create_foreign_key(
+        u'pull_request_flags_token_id_fkey',
+        'pull_request_flags',
+        'tokens',
+        ['token_id'],
+        ['id'],
+        ondelete="CASCADE",
+        onupdate="CASCADE",
+    )
+
+
+def downgrade():
+    """ Remove the existing foreign key in pull_request_flags.token_id and
+    re-create it with without specifying the behavior on delete and update.
+    """
+    op.drop_constraint('pull_request_flags_token_id_fkey', 'pull_request_flags')
+    op.create_foreign_key(
+        u'pull_request_flags_token_id_fkey',
+        'pull_request_flags',
+        'tokens',
+        ['token_id'],
+        ['id'],
+    )
diff --git a/pagure/lib/model.py b/pagure/lib/model.py
index 793da43..ac8e148 100644
--- a/pagure/lib/model.py
+++ b/pagure/lib/model.py
@@ -2293,7 +2293,9 @@ class PullRequestFlag(BASE):
         nullable=False,
     )
     token_id = sa.Column(
-        sa.String(64), sa.ForeignKey("tokens.id"), nullable=True
+        sa.String(64),
+        sa.ForeignKey("tokens.id", ondelete="CASCADE", onupdate="CASCADE"),
+        nullable=True
     )
     status = sa.Column(sa.String(32), nullable=False)
     user_id = sa.Column(