{"record":{"id":"daebf7501b33e44e","repo":"datawhalechina/hello-agents","slug":"error-daebf7","errorCode":null,"errorMessage":"删除失败: ","messagePattern":"删除失败: ","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"Co-creation-projects/lgs-only-NovelGenerator/frontend/index.html","lineNumber":434,"sourceCode":"                        loading.value = false;\n                        currentAction.value = null;\n                    }\n                };\n\n                const deleteOutline = async () => {\n                    if(!confirm('确定要删除当前大纲吗？此操作不可恢复。')) return;\n                    loading.value = true;\n                    currentAction.value = 'delete_outline';\n                    try {\n                        const params = new URLSearchParams({\n                            novel_id: project.novel_id,\n                            title: project.title,\n                            note_id: outline.id\n                        });\n                        const res = await fetch(`${API_URL}/outline/delete?${params.toString()}`, {\n                            method: 'DELETE'\n                        });\n                        if (!res.ok) throw new Error(await res.text());\n                        \n                        outline.id = null;\n                        outline.content = '';\n                        alert('大纲已删除');\n                    } catch (e) {\n                        alert('删除失败: ' + e);\n                    } finally {\n                        loading.value = false;\n                        currentAction.value = null;\n                    }\n                };\n\n                const generateChapters = async () => {\n                    loading.value = true;\n                    currentAction.value = 'chapter';\n                    lastGeneratedChapter.value = null;\n                    \n                    try {","sourceCodeStart":416,"sourceCodeEnd":452,"githubUrl":"https://github.com/datawhalechina/hello-agents/blob/606a07d341a47be773fab7f4b71177f53f96b2c3/Co-creation-projects/lgs-only-NovelGenerator/frontend/index.html#L416-L452","documentation":"'删除失败: ' + e (delete failed) is alerted by the NovelGenerator frontend when DELETE {API_URL}/outline/delete?novel_id=&title=&note_id= responds non-OK; the thrown Error wraps the response text. Deletion passes identifiers purely in the query string, so any missing/unknown id produces a server 404 that surfaces here.","triggerScenarios":"DELETE /outline/delete returns 404 when outline.id is stale (backend store reset, note already deleted) or null (delete invoked when no outline exists — the confirm dialog passes but the request then fails); 422 when novel_id/title are empty because project wasn't initialized; 500 on storage errors.","commonSituations":"Double-clicking delete (second request 404s because the note is gone); deleting after a backend restart wiped in-memory notes; entering delete flow with no outline loaded.","solutions":["Guard the action: return early if !outline.id instead of sending a doomed request.","Read the alert body text — 'not found' means treat as success (refresh local state) or inform the user the outline was already gone.","Handle 404 idempotently: clear local outline state anyway since the goal (outline gone) is achieved.","Verify project (novel_id/title) is initialized before any outline operation."],"exampleFix":"// before\nif(!confirm('确定要删除当前大纲吗？此操作不可恢复。')) return;\n// ...fetch delete\n\n// after\nif(!confirm('确定要删除当前大纲吗？此操作不可恢复。')) return;\nif (!outline.id) { outline.content = ''; return; }\n// ...fetch delete; on !res.ok && res.status === 404 treat as deleted","handlingStrategy":"try-catch","validationCode":"if (!outline.id) {\n  // nothing to delete server-side; just clear local state\n  outline.id = null;\n  outline.content = '';\n  return;\n}","typeGuard":null,"tryCatchPattern":"try {\n  const res = await fetch(`${API_URL}/outline/delete?${params}`, { method: 'DELETE' });\n  if (!res.ok && res.status !== 404) throw new Error(`${res.status}: ${(await res.text()).slice(0, 200)}`);\n  outline.id = null;\n  outline.content = '';\n  alert('大纲已删除');\n} catch (e) {\n  alert('删除失败: ' + (e instanceof Error ? e.message : String(e)));\n}","preventionTips":["Treat DELETE 404 as success — the end state (note gone) is already achieved.","Skip the request entirely when outline.id is null.","Prevent double-clicks on destructive buttons with a loading/disabled guard."],"tags":["http","fetch","crud","idempotency","novel-generation"],"backgroundTag":null,"analyzedSha":"606a07d341a47be773fab7f4b71177f53f96b2c3","analyzedAt":"2026-08-14T22:57:27.446Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}