Filtered Stream - Cannot get username nor image url from user

[ethielknd]

I'm using Filtered Streams and testing it with the example
The options I pass to the stream are:

twitter.TweetSearchStreamOpts{
  UserFields: []twitter.UserField{twitter.UserFieldUserName, twitter.UserFieldProfileImageURL},
}

But the result written in the output file doesn't show those values. This is an output example:
tweet: {"Raw":{"data":[{"id":"SomeId","text":"This is the content of the text"}]}}

As you can see, only data.id and data.text are present
What am I missing?

[ethielknd]

Solved, instead of using

UserFields: []twitter.UserField{twitter.UserFieldUserName, twitter.UserFieldProfileImageURL},

With

Expansions:  []twitter.Expansion{twitter.ExpansionAuthorID},

I can get the username. So the options should be

twitter.TweetSearchStreamOpts{
  Expansions:  []twitter.Expansion{twitter.ExpansionAuthorID},
}