+ def update_changeset(struct, params \\ %{}) do
+ changeset = struct
+ |> cast(params, [:bio, :name])
+ |> unique_constraint(:nickname)
+ |> validate_format(:nickname, ~r/^[a-zA-Z\d]+$/)
+ |> validate_length(:bio, min: 1, max: 1000)
+ |> validate_length(:name, min: 1, max: 100)
+ end
+