Autogenerated PDF Thumbnail using PDFThumb in a Matrix Field

Question

I would like to autogenerate a thumbnail of PDF's, and from this question I found the plugin PDFThumb. The problem I'm running into is I'm relatively new to Craft, and I can't seem to figure out how to use the provided code when it is with a Matrix field.

As I said I'm new to this, and I usually end up tying myself in knots when trying to backtrack the variable references, and I think that's the problem here.

The reference code from the plugin repo:

{% for myAsset in item.assetRef %}
    <img src="{{ craft.PDFThumb.thumbnail(myAsset) }}">
    <img src="{{ craft.PDFThumb.thumbnail(myAsset, 100, 100) }}">
    <img src="{{ craft.PDFThumb.thumbnail(myAsset, 100, 150, true, 'jpg') }}">
{% endfor %}

And my code:

{% set pdfBlocks = entry.infoPagePDF.all() %}
{% if pdfBlocks|length %}
        {% for block in pdfBlocks %}
            {% if block.type == "pdf" %}
                {% if block.pdfFile %}
                    {% set rel = block.pdfFile.one() %}
                    {% if rel %}
                        <a href="{{ rel.url }}">{{ rel.title }}</a>
                    {# Autogenerated Thumb #}
                        {% for myAsset in item.assetRef %}
                            <img src="{{ craft.PDFThumb.thumbnail(myAsset) }}">
                        {% endfor %}
                    {% endif %}
                {% endif %}
            {% endif %} 
       {% endfor %}
{% endif %}
                

The link generates fine, it's the image that doesn't.

I've tried a bunch of different variations, but the problem (I think) revolves around the fact I'm not sure what I'm supposed to be referencing in the FOR(myAsset and item.assetRef), so for clarity I reset my attempts to the provided code example.

Answer 1

You mixed in some code from the documentation resulting in a wrong variable name..

{% set pdfBlocks = entry.inhaltMatrix.all() %}
    {% if pdfBlocks|length %}
        {% for block in pdfBlocks %}
            {% if block.type == "pdf" %}
                {% if block.pdfFile %}
                    {% set rel = block.pdfFile.one() %}
                    {% if rel %}
                        <a href="{{ rel.url }}">{{ rel.title }}</a>
                        <img src="{{ craft.PDFThumb.thumbnail(rel) }}">
               
                    {% endif %}
                {% endif %}
            {% endif %} 
       {% endfor %}
{% endif %}

Also be sure to go to the plugins settings and set the appropriate assets paths.