title: Sequelize queries using Express req.query
body: <p>I'm using Sequelize along with Express (REST API). What I want to be able to do is to e.g. send GET request to: <code>api.myapp.com/v1/posts?author_id=some-id-here&amp;tags=tag-a,tag-b</code>
  I would like to somehow configure in my backend code which queries are available for the user to use, and they would be translated into <code>where</code>, <code>include</code> etc. like:</p>
  
  <pre><code>DB.Model.findAll({
    include: [
      { model: DB.Author, as: 'author', where: { ... }},
      { model: DB.Tag, as: 'tags', where: { ... }}
    ],
  });
  
  </code></pre>
  
  <p>My question – is there a package for this?
  I was searching for a while now and have not found anything and writing those by hand seems quite tricky, especially for a newbie in NodeJS/Sequelize.</p>
  
  <p>Thanks!</p>