def join_team():
"""
Joining team view.
:return: HTTP Response
"""
team = Team.get(team_name=request.form['team_name'])
if not team:
team = Team(team_name=request.form['team_name'])
team.save()
else:
team = team[0]
current_user.set_team(team.team_id)
team.increase_rank(current_user.rank)
return redirect(request.referrer)
