tell when query params have been stored

app/controllers/concerns/query_params_store_concern.rb

@@ -1,17 +1,25 @@
 module QueryParamsStoreConcern
   extend ActiveSupport::Concern
 
+  included do
+    helper_method :stored_query_params?
+  end
+
   def store_query_params
     # Don't override already stored params, because we could do goings and comings with authentication, and
     # lost previously stored params
-    return if session[:stored_params].present? || request.query_parameters.empty?
+    return if stored_query_params? || request.query_parameters.empty?
 
     session[:stored_params] = request.query_parameters.to_json
   end
 
   def retrieve_and_delete_stored_query_params
-    return {} if session[:stored_params].blank?
+    return {} unless stored_query_params?
 
     JSON.parse(session.delete(:stored_params))
   end
+
+  def stored_query_params?
+    session[:stored_params].present?
+  end
 end

spec/controllers/concerns/query_params_store_concern_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe QueryParamsStoreConcern, type: :controller do
       let(:params) { { param1: "param1" } }
 
       it "does nothing" do
-        session[:stored_params] = "there is alread something in there"
+        session[:stored_params] = "there is already something in there"
 
         expect { store_query_params }.not_to change { session[:stored_params] }
       end
@@ -63,4 +63,21 @@ RSpec.describe QueryParamsStoreConcern, type: :controller do
       end
     end
   end
+
+  describe '#stored_query_params?' do
+    subject(:stored_query_params?) { controller.stored_query_params? }
+
+    before { controller.store_query_params }
+    context 'when query params have been stored' do
+      let(:params) { { param1: "param1", param2: "param2" } }
+
+      it { is_expected.to eq(true) }
+    end
+
+    context 'when query params have not been stored' do
+      let(:params) { {} }
+
+      it { is_expected.to eq(false) }
+    end
+  end
 end