Only fetch structure entries that are first level or sub level that don't have a parent

Question

I have a Structure with my entries in. How can I hide the parent entries that contain children? I still want to show the parents children.

For example I want all the below entries bar "About" and "Services"

- Home
- About
    - Sub
    - Sub
    - Sub
- Stuff
- Services
    - Sub
    - Sub
    - Sub
- Things 

So, this is my code right now

{# Set parameters for prev/next elements list #}
{% set params = craft.entries.section('pages') %}

{# Get the prev/next elements #}
{% set prevEntry = entry.getPrev(params) %}
{% set nextEntry = entry.getNext(params) %}

Do I need to modify the params to remove the entries that are parents?

Answer 1

You can use the hasDescendants() method to filter out any parent entry with children. You have to use an ElementCriteriaModel with .getPrev() and .getNext().

{% set entries = craft.entries.section( 'pages' ) %}
{% set entryIds = [] %}

{% for entry in entries %}
  {% if not entry.hasDescendants() %}
    {% set entryIds = entryIds|merge( [entry.id] ) %}
  {% endif %}
{% endfor %}

{% set criteria = craft.entries.id( entryIds ) %}

{% set prevEntry = entry.getPrev( criteria ) %}
{% set nextEntry = entry.getNext( criteria ) %}

You will also need to add logic to get the first and last entry is next or previous is null.