first

helpers.py

@@ -0,0 +1,34 @@
+import datetime as dt
+
+import dateparser as dp
+from sqlalchemy import Column, Integer, desc
+
+from app.database import SessionLocal
+
+
+class Invalid(Exception):
+    pass
+
+
+def parse_date_string(date_string) -> dt.date:
+    try:
+        return dp.parse(date_string).date()
+    except Exception:
+        raise Invalid
+
+
+class BaseMixIn:
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    __mapper_args__ = {"order_by": desc("id")}
+
+    def __init__(self, **kwargs):
+        super(BaseMixIn, self).__init__(**kwargs)
+        self.when = dt.datetime.now()
+
+    @classmethod
+    def delete_most_recent(cls):
+        db = SessionLocal()
+        db.delete(db.query(cls).first())
+        db.commit()