Update order details table

db_migrations/versions/7a341d712aa5_order_detail_changes.py

@@ -0,0 +1,51 @@
+"""order_detail changes
+
+Revision ID: 7a341d712aa5
+Revises: 78da3a78bfd6
+Create Date: 2023-09-29 13:22:35.204135
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '7a341d712aa5'
+down_revision: Union[str, None] = '78da3a78bfd6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Make the vendor optional
+    op.alter_column(
+        'order_details',  
+        'vendor_id',      
+        nullable=True,    
+    )
+
+    # Convert existing values to integers (for example, if representing cents)
+    op.execute('UPDATE order_details SET unit_price = ROUND(unit_price * 100)')
+    op.execute('UPDATE order_details SET total_price = ROUND(total_price * 100)') 
+
+    # Alter the column type
+    op.alter_column('order_details', 'unit_price', type_=sa.Integer)
+    op.alter_column('order_details', 'total_price', type_=sa.Integer)
+
+
+def downgrade() -> None:
+    op.alter_column(
+        'order_details',
+        'vendor_id',
+        nullable=False,
+    )
+
+    # Alter the column type back to Numeric
+    op.alter_column('order_details', 'unit_price', type_=sa.Numeric(10, 2))
+    op.alter_column('order_details', 'total_price', type_=sa.Numeric(10, 2))
+
+    # Convert integer values back to their decimal representations
+    op.execute('UPDATE order_details SET unit_price = total_price / 100.0')
+    op.execute('UPDATE order_details SET total_price = total_price / 100.0')