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Is it possible to use a liquid "where" array filter with nested properties? – Shopify

I’m trying to filter an array of blocks using block settings. I can filter by properties like “type” using the following syntax:

{% assign example = section.blocks | where: "type", "photos" %}

What I need to do is filter by block settings, something like this:

{% assign example = section.blocks | where: settings.collection, collection.handle %}

The above example is failing silently.

A note: Currently I am accomplishing what I need using a capture with a for loop and an if statement, and then assigning with a split — but the code is so bloated, and doing all that for a simple filter operation seems ridiculous. I find myself constantly feeling like I’m fighting with liquid, and I guess I’m hoping it might be just a bit more elegant than I’m giving it credit for.

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3

Answers


  1. 0

    You are doing it wrong. where will work only at the root element. In your case section.blocks is the root element so where can be used for something like section.blocks.abcd_property.

    Rough example: {% assign example = section.blocks | where: 'collection', collection.handle %} will load all section blocks having their collection property as collection.handle value

    This will work

    {% if settings.collection == collection.handle  %}
{% assign example = section.blocks %}
{% else %}
{% assign example = '' | split: '' %}
{% endif %}
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  2. 0

    I don’t know much about Ruby, but it seems you can’t pass nested properties with dot notation to the where filter. However, after seeing people accessing nested values using map, I tested mixing the two, and the map filter seems to work well for this case.

    I have a boolean setting called default in my blocks, and I got the settings object for the last block with default set to true using this:

    {% assign obj = section.blocks | map: 'settings' | where: 'default' | last %}

    Of course, then you can’t get data outside of the settings object that was extracted. For that I think you really would need to loop through the section.blocks and find filter manually using the if tag.

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  3. 0

    Previously used map which loses outer data but found string notation works with where for nested properties:

    E.g., Using a posts collection where each .md file has the front-matter:

    header:
    isArchived: true

    The following liquid snippet filters archived posts via header.isArchived:

    {% assign archived = site.posts | where: "header.isArchived", true %}
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