@Scout I want my ConfigurableResource's field to take value of datetime. How can I do that and ensure that passed value is indeed datetime?

To ensure that a field of a

ConfigurableResource

in Dagster takes a value of

datetime

and that the passed value is indeed a

datetime

, you can use Pydantic's validation features, as

ConfigurableResource

leverages Pydantic for data validation and serialization. Here's a step-by-step guide based on the documentation: 1. Define your

ConfigurableResource

subclass and include a field of type

datetime

. 2. Use Pydantic's validators to ensure that the value passed to this field is a valid

datetime

object. Here's an example code snippet that illustrates how you might define such a resource:

python from dagster import ConfigurableResource from pydantic import BaseModel, validator from datetime import datetime  class MyDatetimeResource(ConfigurableResource):     datetime_field: datetime      @validator('datetime_field', pre=True)     def check_datetime(cls, value):         if not isinstance(value, datetime):             raise ValueError(f"The value {value} is not a valid datetime object")         return value

In this example,

MyDatetimeResource

is a subclass of

ConfigurableResource

with a field

datetime_field

that is expected to be a

datetime

object. The

@validator

decorator is used to define a class method that checks whether the provided value is indeed a

datetime

object. If it's not, a

ValueError

is raised. When you instantiate this resource and provide a configuration, Dagster will use Pydantic's validation mechanism to ensure that the

datetime_field

is a valid

datetime

object. If the validation fails, an error will be raised, and the resource will not be instantiated with the invalid configuration. Please note that the code example provided is a general illustration based on how Pydantic and Dagster's

ConfigurableResource

work together. The actual implementation may vary based on your specific requirements and the version of Dagster you are using. Always refer to the latest Dagster documentation for the most accurate and up-to-date guidance.