Migrate OTP attribute to integer

database/models.py

@@ -18,7 +18,7 @@ class Users(Base):
     user_image = Column(String(255))
     city_id = Column(Integer, ForeignKey("cities.id"))
     user_type = Column(Integer)
-    otp = Column(String(255))
+    otp = Column(Integer)
     otp_valid_time = Column(DateTime)
     access_key = Column(Text, unique=True)
     lang_type = Column(Integer)

migrations/versions/d994081ed483_set_otp_as_integer.py

@@ -0,0 +1,29 @@
+"""set otp as integer
+
+Revision ID: d994081ed483
+Revises: 1387db583e1d
+Create Date: 2020-09-25 07:11:21.603504
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "d994081ed483"
+down_revision = "1387db583e1d"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("users") as batch_op:
+        batch_op.alter_column(
+            column_name="otp", existing_type=sa.String(length=255), type_=sa.Integer,
+        )
+    query = "SELECT CAST(otp AS INTEGER) from users"
+    op.execute(query)
+
+
+def downgrade():
+    pass