Source code for feast.entity

# Copyright 2019 The Feast Authors
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
from datetime import datetime
from typing import Dict, List, Optional

from google.protobuf.json_format import MessageToJson
from typeguard import typechecked

from feast.protos.feast.core.Entity_pb2 import Entity as EntityProto
from feast.protos.feast.core.Entity_pb2 import EntityMeta as EntityMetaProto
from feast.protos.feast.core.Entity_pb2 import EntitySpecV2 as EntitySpecProto
from feast.usage import log_exceptions
from feast.value_type import ValueType

[docs]@typechecked class Entity: """ An entity defines a collection of entities for which features can be defined. An entity can also contain associated metadata. Attributes: name: The unique name of the entity. value_type: The type of the entity, such as string or float. join_key: A property that uniquely identifies different entities within the collection. The join_key property is typically used for joining entities with their associated features. If not specified, defaults to the name. description: A human-readable description. tags: A dictionary of key-value pairs to store arbitrary metadata. owner: The owner of the entity, typically the email of the primary maintainer. created_timestamp: The time when the entity was created. last_updated_timestamp: The time when the entity was last updated. """ name: str value_type: ValueType join_key: str description: str tags: Dict[str, str] owner: str created_timestamp: Optional[datetime] last_updated_timestamp: Optional[datetime] @log_exceptions def __init__( self, *, name: str, join_keys: Optional[List[str]] = None, value_type: Optional[ValueType] = None, description: str = "", tags: Optional[Dict[str, str]] = None, owner: str = "", ): """ Creates an Entity object. Args: name: The unique name of the entity. join_keys (optional): A list of properties that uniquely identifies different entities within the collection. This currently only supports a list of size one, but is intended to eventually support multiple join keys. value_type (optional): The type of the entity, such as string or float. If not specified, it will be inferred from the schema of the underlying data source. description (optional): A human-readable description. tags (optional): A dictionary of key-value pairs to store arbitrary metadata. owner (optional): The owner of the entity, typically the email of the primary maintainer. Raises: ValueError: Parameters are specified incorrectly. """ = name self.value_type = value_type or ValueType.UNKNOWN if join_keys and len(join_keys) > 1: # TODO(felixwang9817): When multiple join keys are supported, add a `join_keys` attribute # and deprecate the `join_key` attribute. raise ValueError( "An entity may only have a single join key. " "Multiple join keys will be supported in the future." ) elif join_keys and len(join_keys) == 1: self.join_key = join_keys[0] else: self.join_key = self.description = description self.tags = tags if tags is not None else {} self.owner = owner self.created_timestamp = None self.last_updated_timestamp = None def __hash__(self) -> int: return hash((, self.join_key)) def __eq__(self, other): if not isinstance(other, Entity): raise TypeError("Comparisons should only involve Entity class objects.") if ( != or self.value_type != other.value_type or self.join_key != other.join_key or self.description != other.description or self.tags != other.tags or self.owner != other.owner ): return False return True def __str__(self): return str(MessageToJson(self.to_proto())) def __lt__(self, other): return <
[docs] def is_valid(self): """ Validates the state of this entity locally. Raises: ValueError: The entity does not have a name or does not have a type. """ if not raise ValueError("The entity does not have a name.") if not self.value_type: raise ValueError(f"The entity {} does not have a type.")
[docs] @classmethod def from_proto(cls, entity_proto: EntityProto): """ Creates an entity from a protobuf representation of an entity. Args: entity_proto: A protobuf representation of an entity. Returns: An Entity object based on the entity protobuf. """ entity = cls(, join_keys=[entity_proto.spec.join_key], description=entity_proto.spec.description, tags=dict(entity_proto.spec.tags), owner=entity_proto.spec.owner, ) entity.value_type = ValueType(entity_proto.spec.value_type) if entity_proto.meta.HasField("created_timestamp"): entity.created_timestamp = entity_proto.meta.created_timestamp.ToDatetime() if entity_proto.meta.HasField("last_updated_timestamp"): entity.last_updated_timestamp = ( entity_proto.meta.last_updated_timestamp.ToDatetime() ) return entity
[docs] def to_proto(self) -> EntityProto: """ Converts an entity object to its protobuf representation. Returns: An EntityProto protobuf. """ meta = EntityMetaProto() if self.created_timestamp: meta.created_timestamp.FromDatetime(self.created_timestamp) if self.last_updated_timestamp: meta.last_updated_timestamp.FromDatetime(self.last_updated_timestamp) spec = EntitySpecProto(, value_type=self.value_type.value, join_key=self.join_key, description=self.description, tags=self.tags, owner=self.owner, ) return EntityProto(spec=spec, meta=meta)