title: How to use query operator "like" supported by Flask-Restless
body: <p>I have the following class relationships and I have been wondering how to use "Like" operator. </p>
  
  <pre><code>class A(db.Model):
      b = db.relationship("B")
  
  class B(db.Model):
      info = db.Column(db.String(20))
  </code></pre>
  
  <p>When I contract a query as:</p>
  
  <pre><code>q={"filters": [{"name":"b__info", "op":"like", "val": "M%"}],
      ..."order_by"... "page.."}
  </code></pre>
  
  <p>I am given these outputs</p>
  
  <pre><code>{
       "message": "Unable to construct query"
  }
  </code></pre>
  
  <p>If I should change "op" from "like" to "any", I won't get that error message.</p>
  
  <p>Have you had any useful guidance on "like" Operator?</p>
  
  <p>Thx</p>
  
  <p>chfw</p>