ValueMapping

Cursor positioned at a GraphQL result leaf

Root Cursor focussed on the top level operation of a query

Construction of mapping-specific cursors is handled by delegation to mkCursorForField which is typically overridden inMapping` subtypes.

Root effects can perform an intial effect prior to computing the resulting Cursor and effective Query.

Convenience methods are provided to cover the cases where only one of the query or the cursor are computed, and for where the computation is one-shot or a Stream. One-shot effects are used to perform initial effectful setup for a query or to perform the effect associated with a GraphQL mutation. Stream effects are used for GraphQL subscriptions.

If only the query is computed the default root cursor for the mapping will be used. If only the cursor is computed the client query (after elaboration) is used unmodified ... in this case results of the performed effect can only be passed to the result construction stage via the environment associated with the returned cursor.

Yields a Cursor focused on the top level operation type of the query

True if the supplied type is a leaf with respect to the GraphQL schema or mapping, false otherwise.

Yields a Cursor suitable for traversing the query result corresponding to the fieldName child of parent.

This method is typically overridden in and delegated to by Mapping subtypes.

Yields the RootEffect, if any, associated with fieldName.