Building Shopify themes is fun, but it has it's limitations. As long as you go into it aware of some of these you won't be in for a shock when it doesn't do things that might be available in other hosted solutions. There are also a multitude of small/hacks and workarounds that are well documented or you just stumble upon by mistake, one of these I've outlined below.
I've been working on a new Shopify build for a client that required a parent/child relationship for pages. Even though this structure doesn't actually exist in Shopify, for things like drop down menus you can use linklists and naming conventions to work around this and give the impression to the user on the front end that this relationship exists. Essentially a linklist becomes a category to assign a page to.
The client wanted to take this a step further and have an index page for each parent page that would output a list of the child pages beneath it with an image, a title, an excerpt and a link through to the child page. This needed to be dynamic so it didn't require manual updating. Thankfully a workaround exists for this in the form of linklist objects.
Linklist objects
My approach to this was to create a 'page.index.liquid' layout that would be used for these index pages. I would then create a linklist loop that would capture the page name which matches the linklist name and output the objects(link) below it.
The first thing to do was capture the page title within a variable and downcase it so it matches the linklist name. I was lucky in that the pages have singular names but you could easily use join to do the same thing.
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{% assign page_name = page.title | downcase %}
Now I can create my linklist for loop using square brackets to capture the page_name variable.
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{% for link in linklists[page_name].links %}
{% endfor %}
Each of the child links now has it's own object I can use to output the various bits of content. Firstly I needed to see if an image exists on the page. If so grab it and show it, if not show a place holder image.
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{% assign page_has_image = false %}
{% assign img_tag = '<' | append: 'img' %}
{% if link.object.content contains img_tag %}
{% assign src = link.object.content | split: 'src="' %}
{% assign src = src[1] | split: '"' | first %}
{% if src %}
{% assign page_has_image = true %}
{% assign image_src = src | replace: '_small', '' | replace: '_compact', '' | replace: '_medium', '' | replace: '_large', '' | replace: '_grande', '' %}
{% endif %}
{% endif %}
{% if page_has_image %}
<a href="{{ link.object.url }}">
<img src="{{ image_src }}" alt="{{ link.object.title }}">
</a>
{% else %}
<a href="{{ link.object.url }}">
{{ 'blank-page-image.jpg' | asset_url | img_tag: shop.name }}
</a>
{% endif %}
Next I need to output the page content. In this case a title, an excerpt and a read more link.
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<h2><a href="{{ link.object.url }}">{{ link.object.title }}</a> </h2>
<p class="sub-head">{{ link.object.page_description }}</p>
<div>
<p>{{ link.object.content | strip_html | truncatewords: 40 }}</p>
</div>
<a href="{{ link.object.url }}" class="read-more">Continue reading</a>
So the loop in full would look like the following.
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{% assign page_name = page.title | downcase %}
{% for link in linklists[page_name].links %}
{% assign page_has_image = false %}
{% assign img_tag = '<' | append: 'img' %}
{% if link.object.content contains img_tag %}
{% assign src = link.object.content | split: 'src="' %}
{% assign src = src[1] | split: '"' | first %}
{% if src %}
{% assign page_has_image = true %}
{% assign image_src = src | replace: '_small', '' | replace: '_compact', '' | replace: '_medium', '' | replace: '_large', '' | replace: '_grande', '' %}
{% endif %}
{% endif %}
{% if page_has_image %}
<a href="{{ link.object.url }}">
<img src="{{ image_src }}" alt="{{ link.object.title }}">
</a>
{% else %}
<a href="{{ link.object.url }}">
{{ 'blank-page-image.jpg' | asset_url | img_tag: shop.name }}
</a>
{% endif %}
<h2><a href="{{ link.object.url }}">{{ link.object.title }}</a></h2>
<p class="sub-head">{{ link.object.page_description }}</p>
<div>
<p>{{ link.object.content | strip_html | truncatewords: 40 }}</p>
</div>
<a href="{{ link.object.url }}" class="read-more">Continue reading</a>
{% endfor %}
Hopefully this helps anyone out looking for a similar solution.