Find all producers for which we can create variant overrides

lib/open_food_network/permissions.rb

@@ -20,6 +20,11 @@ module OpenFoodNetwork
       managed_and_related_enterprises_with :edit_profile
     end
 
+    def variant_override_producers
+      producer_ids = variant_override_enterprises_per_hub.values.flatten.uniq
+      Enterprise.where(id: producer_ids)
+    end
+
     # For every hub that an admin manages, show all the producers for which that hub may
     # override variants
     # {hub1_id => [producer1_id, producer2_id, ...], ...}

spec/lib/open_food_network/permissions_spec.rb

@@ -34,6 +34,19 @@ module OpenFoodNetwork
       end
     end
 
+    describe "finding all producers for which we can create variant overrides" do
+      let(:e1) { create(:supplier_enterprise) }
+      let(:e2) { create(:supplier_enterprise) }
+
+      it "compiles the list from variant_override_enterprises_per_hub" do
+        permissions.stub(:variant_override_enterprises_per_hub) do
+          {1 => [e1.id], 2 => [e1.id, e2.id]}
+        end
+
+        permissions.variant_override_producers.sort.should == [e1, e2].sort
+      end
+    end
+
     describe "finding enterprises for which variant overrides can be created, for each hub" do
       let!(:hub) { create(:distributor_enterprise) }
       let!(:producer) { create(:supplier_enterprise) }