title: Query elements with association object with SQLAlchemy
body: <p>I am new with SQLAlchemy. I have this models:</p>
  
  <pre><code>class AssociationUserClub(db.Model):
      user_id = db.Column(db.Integer, db.ForeignKey('user.id'), primary_key=True)
      club_id = db.Column(db.Integer, db.ForeignKey('club.id'), primary_key=True)
      roleClub = db.Column( db.String(50) , nullable = False, server_default = "member" )
      club = db.relationship("Club", back_populates="members")
      user = db.relationship("User", back_populates="clubs")
  
  class User(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      email = db.Column(db.String(200), unique=True)
      clubs = db.relationship("AssociationUserClub", back_populates="user")
  
  class Club(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      name = db.Column( db.String(255), unique = True, nullable = False )
      members = db.relationship("AssociationUserClub", back_populates="club")
  </code></pre>
  
  <p>I want a list of all users that an user knows in all the clubs which he is a member.</p>
  
  <p>I try whith this, but I didn't find the right answer:</p>
  
  <pre><code>User.query.filter( User.clubs.any( xxxx) ).all()
  </code></pre>
  
  <p>Many thanks </p>