Manuel Fideles
02/28/2024, 12:15 PMScout
02/28/2024, 12:15 PM.yaml
file, you would typically follow these steps: 1. Define a Python class that extends from Config
and includes type-annotated fields corresponding to the configuration schema you want to use for your asset. This class will represent the configuration schema in Pythonic form. 2. Load your .yaml
file into a Python dictionary. You can use libraries like PyYAML
or ruamel.yaml
to parse the YAML content. 3. Instantiate your Python class with the loaded configuration data. Since the class is based on Config
, it should be able to validate and handle the configuration data according to the defined schema. Here is an example based on the documentation: python from dagster import Config, asset import yaml # Step 1: Define a Python class for your asset config class MyAssetConfig(Config): person_name: str # Step 2: Load the YAML file into a Python dictionary with open('config.yaml', 'r') as file: yaml_config = yaml.safe_load(file) # Step 3: Instantiate the Python class with the YAML config data config = MyAssetConfig(**yaml_config) # Define your asset using the class-based config @asset def greeting(config: MyAssetConfig) -> str: return f"hello {config.person_name}"
In this example, config.yaml
would be a YAML file containing the necessary configuration for the MyAssetConfig
class, such as: yaml person_name: "Alice"
Please note that the provided code example is a general illustration based on the documentation. You may need to adjust the code to fit your specific use case and ensure that the YAML file structure matches the schema defined in your Python class.Manuel Fideles
02/28/2024, 12:26 PMScout
02/28/2024, 12:26 PM.yml
files and you want to instantiate a config for each one, you can follow these steps: 1. Define a Python class that extends from Config
with the desired schema. 2. Load each .yaml
file into a separate Python dictionary. 3. Instantiate your Python class with each loaded configuration dictionary. Here's an example of how you might do this: python from dagster import Config, asset import yaml # Define a Python class for your asset config class MyAssetConfig(Config): person_name: str # Function to load a YAML file and instantiate the config class def load_config_from_yaml(file_path): with open(file_path, 'r') as file: yaml_config = yaml.safe_load(file) return MyAssetConfig(**yaml_config) # Load different configurations config1 = load_config_from_yaml('config1.yaml') config2 = load_config_from_yaml('config2.yaml') # Define your asset using the class-based config @asset def greeting(config: MyAssetConfig) -> str: return f"hello {config.person_name}" # Now you can use config1 and config2 with your asset greeting1 = greeting(config=config1) greeting2 = greeting(config=config2)
In this example, config1.yaml
and config2.yaml
are two separate YAML files that contain configuration data following the schema defined in MyAssetConfig
. The load_config_from_yaml
function reads a YAML file, parses it into a dictionary, and then instantiates MyAssetConfig
with that dictionary. This approach allows you to manage multiple configurations and use them as needed with your assets or other parts of your Dagster application.Manuel Fideles
02/28/2024, 12:54 PMScout
02/28/2024, 12:54 PMpython from dagster import asset, Field # Define your asset with a config schema @asset(config_schema={"greeting": Field(str, is_required=False, default_value="Hello")}) def my_asset(context): # Access the configuration value greeting = context.op_config["greeting"] # Use the configuration value in the asset's computation result = f"{greeting}, world!" return result
In this example, the asset my_asset
has a configuration schema that expects a "greeting" field. The asset uses the value of this configuration field to construct a string that it then returns. If you want to return configuration data as part of an asset's output, you would need to incorporate that configuration data into the asset's computation result. However, this is not a common pattern in Dagster, as configuration is generally used to control the behavior of computations rather than being part of the data that those computations produce. If you have a specific use case in mind where you think returning configuration from an asset would be necessary, it might be helpful to reconsider the design of your assets or how you're using configuration in your Dagster application. Configuration is typically static for a given run and is not meant to be manipulated or returned by the computations themselves.