Updates MutationFn signature.

graphql-go / relay

A Go/Golang library to help construct a graphql-go server supporting react-relay.

MIT License

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Closed chris-ramon closed 8 years ago

chris-ramon commented 8 years ago

Issue: #12

[x] Updates relay.MutationFn signature to possible return an error and a test to verify that.
[x] Cherry picks commits from initial related PR, thanks @pyros2097 :+1: