Commits#show (plural) is going to be for showing commit history on a specific path.
Instead of doing this: link_to(commit.id, project_commit_path(project, id: commit.id)) Note.create(noteable_id: commit.id, noteable_type: "Commit", ...) It lets us do this: link_to(commit.id, project_commit_path(project, commit)) Note.create(noteable: commit, ...)