1 files changed, 20 insertions, 0 deletions
diff --git a/app/finders/concerns/custom_attributes_filter.rb b/app/finders/concerns/custom_attributes_filter.rb
new file mode 100644
index 00000000000..5bbf9ca242d
--- /dev/null
+++ b/app/finders/concerns/custom_attributes_filter.rb
@@ -0,0 +1,20 @@
+module CustomAttributesFilter
+  def by_custom_attributes(items)
+    return items unless params[:custom_attributes].is_a?(Hash)
+    return items unless Ability.allowed?(current_user, :read_custom_attribute)
+
+    association = items.reflect_on_association(:custom_attributes)
+    attributes_table = association.klass.arel_table
+    attributable_table = items.model.arel_table
+
+    custom_attributes = association.klass.select('true').where(
+      attributes_table[association.foreign_key]
+        .eq(attributable_table[association.association_primary_key])
+    )
+
+    # perform a subquery for each attribute to be filtered
+    params[:custom_attributes].inject(items) do |scope, (key, value)|
+      scope.where('EXISTS (?)', custom_attributes.where(key: key, value: value))
+    end
+  end
+end