feat: eliminar un valor de la lista de parametros

app/helpers/application_helper.rb

@@ -19,6 +19,25 @@ module ApplicationHelper
     [root, name]
   end
 
+  # Devuelve los params sin el valor para una llave, detectando si el
+  # valor es un array.
+  #
+  # @param filtering_params [Hash]
+  # @param key [Symbol,String]
+  # @param value [Any]
+  def filter_params_by(filtering_params, key, value)
+    filtering_params.map do |k, v|
+      if k == key
+        case v
+        when Array then [k, v - [value]]
+        else nil
+        end
+      else
+        [ k, v ]
+      end
+    end.compact.to_h
+  end
+
   def plain_field_name_for(*names)
     root, name = field_name_for(*names)
 

app/views/sites/_header.haml

@@ -15,7 +15,7 @@
       %input.sr-only{ type: 'submit' }
     - @filter_params.each do |param, values|
       - [values].flatten.each do |value|
-        = link_to site_posts_path(@site, **@filter_params),
+        = link_to site_posts_path(@site, **filter_params_by(@filter_params, param, value)),
           class: 'btn btn-secondary btn-sm',
           title: t('posts.remove_filter_help', filter: value),
           aria: { labelledby: "help-filter-#{param}" } do