add User.alternative_id column

app/models.py

@@ -350,6 +350,17 @@ class User(db.Model, ModelMixin, UserMixin, PasswordOracle):
         db.Boolean, default=False, nullable=False, server_default="0"
     )
 
+    # used for flask-login as an "alternative token"
+    # cf https://flask-login.readthedocs.io/en/latest/#alternative-tokens
+    alternative_id = db.Column(db.String(128), unique=True, nullable=True)
+
+    # implement flask-login "alternative token"
+    def get_id(self):
+        if self.alternative_id:
+            return self.alternative_id
+        else:
+            return str(self.id)
+
     @classmethod
     def create(cls, email, name="", password=None, **kwargs):
         user: User = super(User, cls).create(email=email, name=name, **kwargs)

migrations/versions/2021_101111_2fbcad5527d7_.py

@@ -0,0 +1,34 @@
+"""empty message
+
+Revision ID: 2fbcad5527d7
+Revises: 0b1c9ea11aef
+Create Date: 2021-10-11 11:17:46.750252
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '2fbcad5527d7'
+down_revision = '0b1c9ea11aef'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('users', sa.Column('alternative_id', sa.String(length=128), nullable=True))
+    op.create_unique_constraint(None, 'users', ['alternative_id'])
+
+    # set alternative_id to id
+    op.execute('UPDATE users SET alternative_id = id')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'users', type_='unique')
+    op.drop_column('users', 'alternative_id')
+    # ### end Alembic commands ###