Ensure scheme id and postcode don't class

spec/models/scheme_spec.rb

@@ -46,6 +46,10 @@ RSpec.describe Scheme, type: :model do
       end
 
       context "when searching by all searchable fields" do
+        before do
+          location_2.update!(postcode: location_2.postcode.gsub(scheme_1.id.to_s, "0"))
+        end
+        
         it "returns case insensitive matching records" do
           expect(described_class.search_by(scheme_1.id.to_s).count).to eq(1)
           expect(described_class.search_by(scheme_1.id.to_s).first.id).to eq(scheme_1.id)