How to use the dbutils.User.fromIds function in DBUtils

def fromId(db, review_id, branch=None, load_commits=True, profiler=None):
        cursor = db.cursor()
        cursor.execute("SELECT type, branch, state, serial, summary, description, applyfilters, applyparentfilters FROM reviews WHERE id=%s", [review_id])
        row = cursor.fetchone()
        if not row: return None

        type, branch_id, state, serial, summary, description, applyfilters, applyparentfilters = row

        if profiler: profiler.check("Review.fromId: basic")

        if branch is None:
            branch = Branch.fromId(db, branch_id, load_review=False, load_commits=load_commits, profiler=profiler)

        cursor.execute("SELECT uid FROM reviewusers WHERE review=%s AND owner", (review_id,))

        owners = User.fromIds(db, [user_id for (user_id,) in cursor])

        if profiler: profiler.check("Review.fromId: owners")

        review = Review(review_id, owners, type, branch, state, serial, summary, description, applyfilters, applyparentfilters)
        branch.review = review

        # Reviewers: all users that have at least one review file assigned to them.
        cursor.execute("""SELECT DISTINCT uid, assignee IS NOT NULL, type
                            FROM reviewusers
                 LEFT OUTER JOIN fullreviewuserfiles ON (fullreviewuserfiles.review=reviewusers.review AND assignee=uid)
                           WHERE reviewusers.review=%s""",
                       (review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}

(review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}

        for user_id, is_reviewer, user_type in cursor.fetchall():
            if is_reviewer:
                reviewers.append(user_id)
            elif user_id not in review.owners:
                watchers.append(user_id)
                watcher_types[user_id] = user_type

        review.reviewers = User.fromIds(db, reviewers)

        for watcher in User.fromIds(db, watchers):
            review.watchers[watcher] = watcher_types[watcher]

        if profiler: profiler.check("Review.fromId: users")

        return review

(review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}

        for user_id, is_reviewer, user_type in cursor.fetchall():
            if is_reviewer:
                reviewers.append(user_id)
            elif user_id not in review.owners:
                watchers.append(user_id)
                watcher_types[user_id] = user_type

        review.reviewers = User.fromIds(db, reviewers)

        for watcher in User.fromIds(db, watchers):
            review.watchers[watcher] = watcher_types[watcher]

        if profiler: profiler.check("Review.fromId: users")

        if load_commits:
            review.branch.loadCommits(db)

            cursor.execute("""SELECT id
                                FROM reviewchangesets
                                JOIN changesets ON (id=changeset)
                               WHERE review=%s
                                 AND child=ANY (%s)""", (review_id, [commit.id for commit in review.branch.commits]))

            review.changesets = [changeset_id for (changeset_id,) in cursor.fetchall()]

            if profiler: profiler.check("Review.fromId: load commits")

LEFT OUTER JOIN fullreviewuserfiles ON (fullreviewuserfiles.review=reviewusers.review AND assignee=uid)
                           WHERE reviewusers.review=%s""",
                       (review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}

        for user_id, is_reviewer, user_type in cursor.fetchall():
            if is_reviewer:
                reviewers.append(user_id)
            elif user_id not in review.owners:
                watchers.append(user_id)
                watcher_types[user_id] = user_type

        review.reviewers = User.fromIds(db, reviewers)

        for watcher in User.fromIds(db, watchers):
            review.watchers[watcher] = watcher_types[watcher]

        if profiler: profiler.check("Review.fromId: users")

        return review

LEFT OUTER JOIN fullreviewuserfiles ON (fullreviewuserfiles.review=reviewusers.review AND assignee=uid)
                           WHERE reviewusers.review=%s""",
                       (review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}

        for user_id, is_reviewer, user_type in cursor.fetchall():
            if is_reviewer:
                reviewers.append(user_id)
            elif user_id not in review.owners:
                watchers.append(user_id)
                watcher_types[user_id] = user_type

        review.reviewers = User.fromIds(db, reviewers)

        for watcher in User.fromIds(db, watchers):
            review.watchers[watcher] = watcher_types[watcher]

        if profiler: profiler.check("Review.fromId: users")

        if load_commits:
            review.branch.loadCommits(db)

            cursor.execute("""SELECT id
                                FROM reviewchangesets
                                JOIN changesets ON (id=changeset)
                               WHERE review=%s
                                 AND child=ANY (%s)""", (review_id, [commit.id for commit in review.branch.commits]))

            review.changesets = [changeset_id for (changeset_id,) in cursor.fetchall()]

cursor = db.cursor()
        cursor.execute("SELECT type, branch, state, serial, summary, description, applyfilters, applyparentfilters FROM reviews WHERE id=%s", [review_id])
        row = cursor.fetchone()
        if not row: raise NoSuchReview(review_id)

        type, branch_id, state, serial, summary, description, applyfilters, applyparentfilters = row

        if profiler: profiler.check("Review.fromId: basic")

        if branch is None:
            from dbutils import Branch
            branch = Branch.fromId(db, branch_id, load_review=False, profiler=profiler)

        cursor.execute("SELECT uid FROM reviewusers WHERE review=%s AND owner", (review_id,))

        owners = User.fromIds(db, [user_id for (user_id,) in cursor])

        if profiler: profiler.check("Review.fromId: owners")

        review = Review(review_id, owners, type, branch, state, serial, summary, description, applyfilters, applyparentfilters)
        branch.review = review

        # Reviewers: all users that have at least one review file assigned to them.
        cursor.execute("""SELECT DISTINCT uid, assignee IS NOT NULL, type
                            FROM reviewusers
                 LEFT OUTER JOIN fullreviewuserfiles ON (fullreviewuserfiles.review=reviewusers.review AND assignee=uid)
                           WHERE reviewusers.review=%s""",
                       (review_id,))

        reviewers = []
        watchers = []
        watcher_types = {}