Add order class

db/order.py

@@ -2,19 +2,25 @@ from db.mongo import Model
 
 
 class Order(Model):
-    def __init__(self):
-        pass
+    def __init__(self, user_id, product_id):
+        self.__id = None
+        self.__user_id = user_id
+        self.__product_id = product_id
 
     def store(self):
-        pass
+        res = Order.get_collection().insert_one(self.to_dict())
+        return res.inserted_id
 
     @staticmethod
     def get_collection():
-        pass
+        return Model.get_db().get_collection("orders")
 
     @staticmethod
     def dict_to_object(dictionary):
         pass
 
     def to_dict(self):
-        pass
+        return {
+            "user_id": self.__user_id,
+            "product_id": self.__product_id
+        }