title: Marshmallow List of objects with any schema
body: <p>I'm using <a href="https://github.com/marshmallow-code/apispec" rel="nofollow noreferrer">ApiSpec</a> in an aiohttp service for building the docs. Now I need to create a JSON method that takes a list of objects in a free form, with no fields restrictions. So, is it possible to specify a schema with a list of objects with any fields / no validation? I mean something like this:</p>
  <pre class="lang-py prettyprint-override"><code>class UploadInfoRequestSchema(marshmallow.Schema):
      objects = marshmallow.fields.List(marshmallow.fields.Nested(*AnySchema*))
  </code></pre>
  <p><sub>Also, I use <a href="https://github.com/maximdanilchenko/aiohttp-apispec" rel="nofollow noreferrer">aiohttp-apispec</a> package which unfortunately supports OpenAPI v2.0 only, so I hope there is solution for this version.</sub></p>