在Shopify Liquid中将字符串解析为令牌

Question

I have the following string ("my_str") in a Shopify metafield:

a:3,b:1,c:2,d:2,e:2,f:2

The keys are product variant IDs (shortened to a, b, c...) and the numbers are quantities.

I need to parse it into key:value pairs so I can do something like this with it:

{% assign my_str = collection.metafields.local.my_metafield %}
{% assign my_map = my_str | parse ???? %}

{% for product in collection.products %}
    {% assign temp_qty = 1 %}
    {% for pair in my_map %}
        {% if pair[0] == product.variants.first.id %}
          {% assign temp_qty = pair[1] %}
        {% endif %}
    {% endfor %}
    <input type="hidden"  id="abc-{{ forloop.index0 }}" value=temp_qty />
{% endfor %}

I definitely don't know how to parse my_str. I'm also open to suggestions about the best approach overall.

Answer 1

Liquid is pretty limited when it comes to creating arrays. The common approach is to use the split string filter .

In your case, it would look something like this:

{% assign my_str = 'a:3,b:1,c:2,d:2,e:2,f:2' %}
{% assign my_arr = my_str | split: ',' %}

{% for pair_str in my_arr %}
  {% assign pair_arr = pair_str | split: ':' %}
  ID: {{ pair_arr[0] }} Qty: {{ pair_arr[1] }} <br />
{% endfor %}

This blog post is also an interesting read on the topic of Liquid arrays: Advanced Arrays in Shopify's Liquid