Query DSL

[maier49]

#67 Provides a query API, and the ability to serialize queries to RQL, but doesn't provide a plain object API for querying, or a way to restore a query from its serialized representation.

Pulling from the original query issue, this part has still not been implemented:

• Domain Specific Languages - There should be two distinct domain specific languages available to leverage the Query API:
  • Declarative - This API should use simple JavaScript objects (POJOs) to provide a declarative way of describing a query. This allows the query to be easily serialisable to and from JSON. It also allows an easy mechanism for other actors to procedurally generate a query and have it executed by the Query API.
  • Functional - This should have full functional parity with the declarative syntax but be offered up in chain-able functions, so that a developer can build the query incrementally taking advantage of intellisense and robust type validation via TypeScript. There should also be a mechanism to serialise complete functional queries into the declarative syntax.

Dstore's approach to this was to allow RQL to be used to specify filters, and was provided by a separate mixin. I think we could follow a similar pattern here, providing one or more mixins that extend the query API to support different object formats.