How can I exclude a vendor type using a ternary or unless? - shopify

Question

In a page.[].liquid template there are numerous 'vendor' products to be listed. Some with and some without a collection association.
How can I exclude a specific vendor in a for loop using 'unless' or a ternary?
Neither of the following generate any output within the parent container.
<div style="height: 50px;" class="ptest">
{% assign collection = product.available %}
{% for product in collection.all_vendors %}
{% if product.collection != "acme" %}
<div>yes</div>
{{ product.name }}
{% else %}
<div>no</div>
{{ product.name }}
{% endif %}
{% endfor %}
{% for product in collection.all_vendors %}
{% unless product.vendor contains "acme" %}
<div>yes</div>
{{ product.name }}
{% else %}
<div>no</div>
{{ product.name }}
{% endunless %}
{% endfor %}
</div>

Answer 1

List all vendors except "acme":
{%- for vendor in collection.all_vendors -%}
{%- if vendor == "acme" -%}
{%- continue -%}
{%- endif -%}
{{ vendor }} is definitely not "acme"<br>
{%- endfor %}
List collection products except those with vendor "acme":
{%- for product in collection.products -%}
{%- if product.vendor == "acme" -%}
{%- continue -%}
{%- endif -%}
{{ product.name }} vendor is {{ product.vendor }}.<br>
{%- endfor -%}
Sorry, but your code is a mess:
{% assign collection = product.available %} - the collection is now boolean, either true or false
{% for product in collection.all_vendors %} - as of the above collection doesn't have all_vendors attribute.
{% if product.collection != "acme" %} - as of the above, this code will never be reached, but even if it will - the product object doesn't have collection attribute.
{{ product.name }} - where did you get this code? product doesn't have name attribute, you have to use title instead.
{% for product in collection.all_vendors %} - you go through vendors, why do you call them products?
{% unless product.vendor contains "acme" %} - as this is the next line after the above one, the product would be a vendor, not a product object, so you should use it as a string i.e. {% unless product contains "acme" %}

Answer 2

After a lot of searching, it looks like the only solution to displaying products that A. are 'all except' a single vendor and B. are not part of any collection, is to use a more simple if-math.
{% for product in collections.all.products %}
{% if product.collections.size < 1 && product.vendor != "acme" %}
<h3>
<a href="{{ product.url }}">
{{ product.title }}
</a>
</h3>
{% endif %}
{% endfor %}
Running through all products to loop those that are not part of a collection, generates the proper result.