Proposal: Mutation/FetchMore-like query reducer after receiving results of a query

[rricard]

In the recently introduced Mutation and pagination mechanisms, we have the possibility to apply a "reducer" on the query results. This allows for instance to merge mutation results inside of the store or concat and sort two lists (pagination).

However, there is currently no way of applying a function on the results when the query is created (for example for sorting). Yes, this could be achieved in a react component for example but I think that being able to transform query results after retrieval could be useful.

[rricard]

This mechanism could for example let the user control the update from a previous query state and also control how a refetch is merged into the store.

[stubailo]

Can you give me an example of when this would be useful? Is it only for sorting? I'd like to think about a few more use cases before settling on a design.

[rricard]

For now, I only see sorting (what actually I would need it for) but I'll try to thing about other use cases. If we do that, I agree, it has to be useful but I'm sure there are some other cases where it could make sense too.

[Slava]

tracking this in #506

[Slava]

We merged #506.

[rricard]

@Slava thanks!