From a1700c8b1c68c59ba0452829113772c22a1cf17d Mon Sep 17 00:00:00 2001
From: Daniel Bernstein <dabylon@gmail.com>
Date: Tue, 19 Nov 2024 10:08:27 -0800
Subject: [PATCH] Make loan.patron_id and hold.patron_id fields non-nullable.

---
 ...make_loan_patron_id_and_hold_patron_id_.py | 43 +++++++++++++++++++
 src/palace/manager/sqlalchemy/model/patron.py |  4 +-
 2 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 alembic/versions/20241119_58b0ae7f5b67_make_loan_patron_id_and_hold_patron_id_.py

diff --git a/alembic/versions/20241119_58b0ae7f5b67_make_loan_patron_id_and_hold_patron_id_.py b/alembic/versions/20241119_58b0ae7f5b67_make_loan_patron_id_and_hold_patron_id_.py
new file mode 100644
index 000000000..cfd409637
--- /dev/null
+++ b/alembic/versions/20241119_58b0ae7f5b67_make_loan_patron_id_and_hold_patron_id_.py
@@ -0,0 +1,43 @@
+"""Make Loan.patron_id and Hold.patron_id non-nullable.
+
+Revision ID: 58b0ae7f5b67
+Revises: 272da5f400de
+Create Date: 2024-11-19 18:04:24.182444+00:00
+
+"""
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "58b0ae7f5b67"
+down_revision = "272da5f400de"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.alter_column(
+        table_name="loans",
+        column_name="patron_id",
+        nullable=False,
+    )
+
+    op.alter_column(
+        table_name="holds",
+        column_name="patron_id",
+        nullable=False,
+    )
+
+
+def downgrade() -> None:
+    op.alter_column(
+        table_name="loans",
+        column_name="patron_id",
+        nullable=True,
+    )
+
+    op.alter_column(
+        table_name="holds",
+        column_name="patron_id",
+        nullable=True,
+    )
diff --git a/src/palace/manager/sqlalchemy/model/patron.py b/src/palace/manager/sqlalchemy/model/patron.py
index 66d06d5a6..ac5e3ec0e 100644
--- a/src/palace/manager/sqlalchemy/model/patron.py
+++ b/src/palace/manager/sqlalchemy/model/patron.py
@@ -512,7 +512,7 @@ class Loan(Base, LoanAndHoldMixin):
     __tablename__ = "loans"
     id = Column(Integer, primary_key=True)
 
-    patron_id = Column(Integer, ForeignKey("patrons.id"), index=True)
+    patron_id = Column(Integer, ForeignKey("patrons.id"), index=True, nullable=False)
     patron: Mapped[Patron] = relationship("Patron", back_populates="loans")
 
     # A Loan is always associated with a LicensePool.
@@ -562,7 +562,7 @@ class Hold(Base, LoanAndHoldMixin):
 
     __tablename__ = "holds"
     id = Column(Integer, primary_key=True)
-    patron_id = Column(Integer, ForeignKey("patrons.id"), index=True)
+    patron_id = Column(Integer, ForeignKey("patrons.id"), index=True, nullable=False)
     license_pool_id = Column(Integer, ForeignKey("licensepools.id"), index=True)
     license_pool: Mapped[LicensePool] = relationship(
         "LicensePool", back_populates="holds"