Include entries to a entries section object, without 'merge' So I have a structure with a few entries and a single. I want to list out the first level of the structure, plus the single. Then somewhere else, list out the second level. 

I've tried the following:

{% set myPages = craft.entries.section('structureName')|merge(craft.entries.section('singleName')) %}

&lt;nav&gt;
{% nav entry in myPages.level(1) %}
  {{ entry.title }}
{% endnav %}
&lt;nav&gt;

&lt;aside&gt;
{% for entry in myPages.level(2) %}
  {{ entry.title }}
{% endfor %}
&lt;aside&gt;


Which returns this error:


  "Array to string conversion"


When I remove the .level(X) function it will return all the entries, on all levels; including the single. 

For the purposes of making my problem more understandable, I've simplified my above example. I know I could just add the single entry directly into the &lt;nav&gt;. But I'm curious about ways to add to a entries section object without losing the ability to query levels. 

So, in the same way I can exclude entries, is there a way to include an entry from a different section without relying on Twigs merge filter?
A colleague of mine shed some light on a very simple solution

{% set myPages = craft.entries.section(['structureName', 'singleName']).order('sectionId desc') %}

&lt;nav&gt;
{% nav entry in myPages.level([1, null]) %}
  {{ entry.title }}
{% endnav %}
&lt;nav&gt;

&lt;aside&gt;
{% for entry in myPages.level(2) %}
  {{ entry.title }}
{% endfor %}
&lt;aside&gt;


Passing an array of handles/slugs instead of just a string works perfectly. Since singles don't have levels; defining null in the level pulls them out too.