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# coding=utf-8
from _weakref import ref
from flask import Blueprint
from rethinkdb.ast import Table
from pysite.database import RethinkDB
class DBMixin:
"""
Mixin for classes that make use of RethinkDB. It can automatically create a table with the specified primary
key using the attributes set at class-level.
This class is intended to be mixed in alongside one of the other view classes. For example:
>>> class MyView(APIView, DBMixin):
... name = "my_view" # Flask internal name for this route
... path = "/my_view" # Actual URL path to reach this route
... table_name = "my_table" # Name of the table to create
... table_primary_key = "username" # Primary key to set for this table
This class will also work with Websockets:
>>> class MyWebsocket(WS, DBMixin):
... name = "my_websocket"
... path = "/my_websocket"
... table_name = "my_table"
... table_primary_key = "username"
You may omit `table_primary_key` and it will be defaulted to RethinkDB's default column - "id".
"""
table_name = "" # type: str
table_primary_key = "id" # type: str
@classmethod
def setup(cls: "DBMixin", manager: "pysite.route_manager.RouteManager", blueprint: Blueprint):
"""
Set up the view by creating the table specified by the class attributes - this will also deal with multiple
inheritance by calling `super().setup()` as appropriate.
:param manager: Instance of the current RouteManager (used to get a handle for the database object)
:param blueprint: Current Flask blueprint
"""
if hasattr(super(), "setup"):
super().setup(manager, blueprint)
if not cls.table_name:
raise RuntimeError("Routes using DBViewMixin must define `table_name`")
cls._db = ref(manager.db)
manager.db.create_table(cls.table_name, primary_key=cls.table_primary_key)
@property
def table(self) -> Table:
return self.db.query(self.table_name)
@property
def db(self) -> RethinkDB:
return self._db()
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