Add crudkit!

crudkit/mixins.py

@@ -0,0 +1,23 @@
+import datetime as dt
+from sqlalchemy import Column, Integer, DateTime, Boolean
+from sqlalchemy.orm import declared_attr
+from sqlalchemy.ext.hybrid import hybrid_property
+
+class CrudMixin:
+    id = Column(Integer, primary_key=True)
+    created_at = Column(DateTime, default=dt.datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=dt.datetime.utcnow, onupdate=dt.datetime.utcnow, nullable=False)
+    deleted = Column("deleted", Boolean, default=False, nullable=False)
+    version = Column(Integer, default=1, nullable=False)
+
+    @hybrid_property
+    def is_deleted(self):
+        return self.deleted
+
+    def mark_deleted(self):
+        self.deleted = True
+        self.version += 1
+
+    @declared_attr
+    def __mapper_args__(cls):
+        return {"version_id_col": cls.version}