title: KeyError: 'SQLALCHEMY_TRACK_MODIFICATIONS'
body: <p>I tried to get query from database but failed by KeyError: 'SQLALCHEMY_TRACK_MODIFICATIONS'.
  My code is</p>
  
  <pre><code>@app.route("/users/&lt;int:id&gt;")
  def users(id):
  result = Account.query.get(id)    
  return render_template("users.html",username=result.username).
  </code></pre>
  
  <p>I think syntax on query is mistake. Need suggestions !!!</p>