fix: prevent :id stripping when :id not in path (#447)

Address edge case where ResourceName.find({id: id}) would error if controller was set up as a show action

lib/graphiti/resource/links.rb

@@ -76,7 +76,7 @@ def allow_request?(request_path, params, action)
           path = request_path
           if [:update, :show, :destroy].include?(context_namespace) && has_id
             path = request_path.split("/")
-            path.pop
+            path.pop if path.last == has_id.to_s
             path = path.join("/")
           end
           e[:full_path].to_s == path && e[:actions].include?(context_namespace)

spec/resource_spec.rb

@@ -1225,6 +1225,19 @@ def self.name
               end
             end
           end
+
+          # singular resource with singular route
+          context "that is a singular show route without an id but finding the resource by id" do
+            before do
+              request.env["PATH_INFO"] += ""
+            end
+
+            it "works" do
+              Graphiti.with_context ctx, :show do
+                expect { klass.find(id: 123) }.to_not raise_error
+              end
+            end
+          end
         end
 
         context "and the request matches a secondary endpoint" do