I ran this query just now:

query {
  repository(owner: "wojtekmaj" name:"react-date-picker"){
    object(oid:"50e933af2f28ca8da451c63afcced8dca467f2c7"){
      ...fields
    }
  }
}
fragment fields on Commit {

oid

changedFiles

commitResourcePath

commitUrl

message

resourcePath

url

tree{

entries{

name

}

}

}

And the fragment seemed to work. What is it about fragments that isn’t working for you?