Add Filters::ActionRequiredBy

This adds a new filter class for the action_required_by field.

app/lib/filters/action_required_by.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class Filters::ActionRequiredBy < Filters::Base
+  def apply
+    return scope if action_required_by.empty?
+
+    scope.where(action_required_by:)
+  end
+
+  def action_required_by
+    Array(params[:action_required_by]).compact_blank
+  end
+end

spec/lib/filters/action_required_by_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe Filters::ActionRequiredBy do
+  subject(:filtered_scope) { described_class.apply(scope:, params:) }
+
+  context "the params includes a action_required_by" do
+    let(:params) { { action_required_by: "assessor" } }
+    let(:scope) { ApplicationForm.all }
+
+    let!(:included) { create(:application_form, :action_required_by_assessor) }
+    let!(:excluded) { create(:application_form, :action_required_by_admin) }
+
+    it { is_expected.to contain_exactly(included) }
+  end
+
+  context "the params include multiple action_required_by" do
+    let(:params) { { action_required_by: %w[assessor external] } }
+    let(:scope) { ApplicationForm.all }
+
+    let!(:included) { create(:application_form, :action_required_by_assessor) }
+    let!(:excluded) { create(:application_form, :action_required_by_admin) }
+
+    it { is_expected.to contain_exactly(included) }
+  end
+
+  context "the params don't include action_required_by" do
+    let(:params) { {} }
+    let(:scope) { double }
+
+    it { is_expected.to eq(scope) }
+  end
+end