Add created_at field to tasks

alembic/versions/ac2bd309d20c_add_created_at_to_tasks.py

@@ -0,0 +1,34 @@
+"""add created_at to tasks
+
+Revision ID: ac2bd309d20c
+Revises: 40867bd0dcc8
+Create Date: 2020-05-20 12:36:53.685254
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'ac2bd309d20c'
+down_revision = '40867bd0dcc8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Requires batching for non-constant default under SQLite.
+    with op.batch_alter_table('tasks', recreate='always') as batch:
+        batch.add_column(
+            sa.Column(
+                'created_at',
+                sa.DateTime,
+                server_default=sa.func.current_timestamp(),
+                nullable=False
+            )
+        )
+
+
+def downgrade():
+    with op.batch_alter_table('tasks') as tasks:
+        tasks.drop_column('created_at')

src/pyelephant.py

@@ -22,8 +22,8 @@ def rm(session: sa.orm.Session, index: int):
 
 # -----------------------------------------------------------------------------
 def ls(session: sa.orm.Session):
-    for i in session.query(Task):
-        print(i.id, i.title)
+    for i in session.query(Task).order_by(Task.created_at):
+        print(i.id, i.created_at, i.title)
 
 
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