How can I get the last Matrix block of a certain type?

Question

I have a Matrix field with some different block types; images, videos, text, etc. When I loop over the blocks I have some extra code (facebook and twitter sharing, back-button, etc) that should only be output for the last "text" block.

How can I know, inside the loop, if the current block is the last of its type?

Answer 1

What about comparing the currently looped block ID with the ID of the last block of type "text"?

_entry.html:

{% set lastTextBlock = entry.simpleMatrix.type('text').last() %}
{% set lastTextBlockId = lastTextBlock ? lastTextBlock.id : null %}

{% for block in entry.contentBlocks %}
    {% include '_blocks/' ~ block.type|lower %}
{% endfor %}

_blocks/text.html:

{% if block.id == lastTextBlockId %}
    ...
{% endif %}

Answer 2

What about using the length filter on a type filtered array of block models to get the total number of your "text" blocks. And then combine that with a counter in your block include to conditionally output the buttons?

_entry.html:

{% set lastTextBlock = entry.contentBlocks.type('text')|length %}
{% set loopIndexText = 0 %}

{% for block in entry.contentBlocks %}
    {% include '_blocks/' ~ block.type|lower %}
{% endfor %}

_blocks/text.html:

{% set loopIndexText = loopIndexText + 1 %}

{% if loopIndexText == lastTextBlock %}
    ...
{% endif %}

Answer 3

I've come up with this very "manual" approach, which works ok:

{% set lastTextBlock = -1 %}
{% for block in entry.contentBlocks %}
    {% if block.type=='text' %}
        {% set lastTextBlock = loop.index0 %}
    {% endif %}
{% endfor %}

{% for block in entry.contentBlocks %}
    {% include '_blocks/' ~ (block.type | lower) with { 'addButtons': loop.index0==lastTextBlock } %}
{% endfor %}

But is there a better way? It feels a bit dirty and inefficient to loop over the blocks two times.