Replace "hidden" check in Liquid with where_exp

_includes/documents-collection.html

@@ -1,4 +1,4 @@
-{% assign entries = site[include.collection] %}
+{% assign entries = site[include.collection] | where_exp: "post", "post.hidden != true" %}
 
 {% if include.sort_by %}
   {% assign entries = entries | sort: include.sort_by %}
@@ -9,7 +9,5 @@
 {% endif %}
 
 {%- for post in entries -%}
-  {%- unless post.hidden -%}
-    {% include archive-single.html %}
-  {%- endunless -%}
+  {% include archive-single.html %}
 {%- endfor -%}

_includes/page__related.html

@@ -1,14 +1,10 @@
+{% assign posts = include.posts | where_exp: "post", "post.hidden != true" %}
 <div class="page__related">
   {% include before-related.html %}
   <h2 class="page__related-title">{{ site.data.ui-text[site.locale].related_label | default: "You May Also Enjoy" }}</h2>
   <div class="grid__wrapper">
-    {% assign count = 0 %}
-    {% assign limit = include.limit | default: 4 %}
-    {% for post in include.posts %}
-      {% if post.hidden %}{% continue %}{% endif %}
+    {% for post in posts limit:4 %}
       {% if post.id == page.id %}{% continue %}{% endif %}
-      {% if count >= limit %}{% break %}{% endif %}
-      {% assign count = count | plus: 1 %}
       {% include archive-single.html type="grid" %}
     {% endfor %}
   </div>

_includes/posts-category.html

@@ -1,5 +1,4 @@
-{%- for post in site.categories[include.taxonomy] -%}
-  {%- unless post.hidden -%}
-    {% include archive-single.html %}
-  {%- endunless -%}
+{% assign posts = site.categories[include.taxonomy] | where_exp: "post", "post.hidden != true" %}
+{%- for post in posts -%}
+  {% include archive-single.html %}
 {%- endfor -%}

_includes/posts-tag.html

@@ -1,5 +1,4 @@
-{%- for post in site.tags[include.taxonomy] -%}
-  {%- unless post.hidden -%}
-    {% include archive-single.html %}
-  {%- endunless -%}
+{% assign posts = site.tags[include.taxonomy] | where_exp: "post", "post.hidden != true" %}
+{%- for post in posts -%}
+  {% include archive-single.html %}
 {%- endfor -%}