ddd-query-options-specialist

To implement OData query options in a DDD-based API, parse and validate parameters like $filter, $expand, and $select directly from controllers and services. This approach auto-detects filterable properties and applies scoped options to reduce boilerplate.

The best way to auto-detect filterable and expandable properties is to apply a QueryOptions parser that inspects entities and entity sets. This automatically identifies valid fields for filtering and relation loading, ensuring controlled data shaping without manual definitions.

To lazy-load related data with scoped query options, call an expand() method on your parsed QueryOptions. This applies nested relation loading and controlled data shaping to DTOs and services, ensuring only requested relations are fetched.

Yes, you can validate OData query parameters from DTOs by parsing them into structured QueryOptions. This process validates filters, sorts, selects, and pagination rules before they reach the service layer, preventing invalid data querying operations.

To debug invalid OData filters and pagination errors, use a QueryOptions specialist to parse and validate incoming requests. It isolates malformed query parameters during validation, clarifying which filter or expand property failed the data shaping rules.