First attempt at changes to LookupFile table

Want to migrate data and modify table
Have to get session through bind

migrations/versions/4980cb3dea77_modify_lookup_table.py

@@ -0,0 +1,41 @@
+"""modify lookup table file_data_model_id -> file_id
+
+Revision ID: 4980cb3dea77
+Revises: 7225d990740e
+Create Date: 2022-01-06 12:07:47.066325
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+from crc.models.file import FileDataModel, LookupFileModel
+
+
+# revision identifiers, used by Alembic.
+revision = '4980cb3dea77'
+down_revision = '7225d990740e'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    bind = op.get_bind()
+    session = sa.orm.Session(bind=bind)
+
+    op.add_column('lookup_file', sa.Column('file_model_id', sa.Integer(), nullable=True))
+    op.create_foreign_key(None, 'lookup_file', 'file', ['file_model_id'], ['id'])
+
+    lookup_file_records = session.query(LookupFileModel).all()
+    for lookup in lookup_file_records:
+        file_model_id = session.query(FileDataModel.file_model_id).filter(FileDataModel.id==lookup.file_data_model_id).scalar()
+        lookup.file_model_id = file_model_id
+        session.commit()
+
+    op.drop_column('lookup_file', 'file_data_model_id')
+    op.drop_constraint('lookup_file_file_data_model_id_fkey', 'lookup_file', type_='foreignkey')
+
+    print('revision 4980cb3dea77: upgrade: done: ')
+
+
+def downgrade():
+    pass

migrations/versions/7225d990740e_move_files_to_filesystem.py

@@ -57,6 +57,8 @@ def upgrade():
                 session.delete(dependency)
             lookups = session.query(LookupFileModel).filter(LookupFileModel.file_data_model_id==processed_model.id).all()
             for lookup in lookups:
+                # TODO: do the file_data_model_id -> file_model_id dance
+                #  Add file_model_id column, populate file_model_id column, delete file_data_model_id column
                 lookup.file_data_model_id = None
             session.delete(processed_model)
         print(f'upgrade: in processed files: file_id: {file_id}')