title: Define backref parameter
body: <pre><code>class Country(db.Model):
      __tablename__ = 'countries'
      id = db.Column(db.Integer, primary_key=True)
      code = db.Column(db.Integer)
      name_en = db.Column(db.String(100))
      user_country = db.relationship('User', backref='country')
      company_country = db.relationship('Company', backref='country')
  </code></pre>
  
  <p>In this example I am overriding the table name. So, what should be the backref? The <code>tablename</code> or the class name? Or can be anything else?</p>
  
  <p>From the docs:</p>
  
  <p><em>backref is a simple way to also declare a new property on the xxxxx class</em></p>
  
  <p>So, the name of <code>backref</code> is only a general description?</p>
  
  <p>And if I have two tables using the country table, i need to create two relationships, like in my example? the procedure is one relation by each reference in another table?</p>