resultsCallbackFn position in ContextHandler

Hi,

Just wondering what the best way to abort multiple mutations in a single graphql call, currently I have moved the following code :
if h.resultCallbackFn != nil {
h.resultCallbackFn(ctx, ¶ms, result, buff)
}

To just after the line : result := graphql.Do(params)

This way I can verify if all the mutations supplied to the graphql endpoint have been saved to the database and passes any extra validation as required for our business logic, if this fails, I am able to here fail the entire set of mutations.

Would prefer to use the library "as is" without modifying it, as I assume you guys are the ones in the know what is right and wrong with using this library, do you recommend a better solution, or have a done an acceptable solution ?

Thanks in advance
Cheers
Jason