PULL REQUEST DESCRIPTION

This is a proposal for a new dataloader based on the Relay specification. The proposed code will be used to ease the development of GraphQL Relay servers by providing the required page information to the resolving (typically infrastructure) layer.

RELATED TOPIC

In my opinion, using EntityFrameworkCore is the most natural way of resolving GraphQL .NET server requests. However, with the current solution, it is quite painful to fetch data from a DataSet with a Relay implementation. To release the stress, I have coded a ToConnectionDictionary method that is an extension of IQueryable with the following heading:

private static async Task<IDictionary<TKey, Connection<T>>> ToConnectionDictionary<T, TKey>(this IQueryable<T> query, IEnumerable<PageRequest<TKey>> pageRequests, Expression<Func<T, TKey>> keySelector, Expression<Func<T, string>> cursorSelector)

This method fits perfectly with the new RelayBatchDataLoader and relieves the pain of correctly coding it.