Add the "failure?" method to the outcome

[ryanfaerman]

The failure? method helps consumers of the mutations add some clarity.

Sometimes after a mutation, you really just want to recover gracefully on failure and I've found myself with plenty of code resembling the following:

mutation = SomeMutationClass.run(some_params)
unless mutation.success?
  # do something to recover, like attempt something else
end

Having the failure? method makes things just a little clearer since the code can now ask if failure?.

[anicholson]

Would be a nice addition, +1

[ryanfaerman]

It looks like the build failed on this primarily because the rbx ruby target is not running properly.

[eugeneius]

This does look like it would be useful - sorry it sat unacknowledged for so long 😔

Would you be interested in rebasing this and resolving the conflicts so that I can merge it?