[%Statcasters.Prediction{
    __meta__: #Ecto.Schema.Metadata<:loaded, "predictions">,
    id: 6,
    inserted_at: ~N[2018-01-23 01:42:18.417113],
    points: 20,
    question: #Ecto.Association.NotLoaded<association :question is not loaded>,
    question_id: 110,
    team: #Ecto.Association.NotLoaded<association :team is not loaded>,
    team_id: 1,
    updated_at: ~N[2018-01-23 01:42:18.417122]
  },
  %Statcasters.Prediction{
    __meta__: #Ecto.Schema.Metadata<:loaded, "predictions">,
    id: 7,
    inserted_at: ~N[2018-01-23 01:57:20.144606],
    points: 20330,
    question: #Ecto.Association.NotLoaded<association :question is not loaded>,
    question_id: 110,
    team: #Ecto.Association.NotLoaded<association :team is not loaded>,
    team_id: 1,
    updated_at: ~N[2018-01-23 01:57:20.144614]
  }
]

Enum.map(team.predictions, fn(prediction) -> prediction.question_id end)

'nn'