Menu
Examples
Stack Overflow
A multi-page Q&A site — ranked question list and per-question answers — over a real Drizzle/PGlite database. The source tabs show the fully compiler-derived optimism behind voting and posting answers.
Live appOpen in new tab ↗
/** @jsxImportSource @kovojs/server */
import { component, FormError, type ComponentRenderSlots } from '@kovojs/core';
import * as style from '@kovojs/style';
import { postQuestionMutation } from '../mutations.js';
import { questionList, questionScore } from '../queries.js';
import { postQuestionForm, type QuestionListItem, type SoRequest } from '../model.js';
import {
compactCount,
freshId,
parseTags,
renderTags,
renderUserCard,
viewsFor,
voteButton,
} from '../components/chrome.js';
// Question list for `/`. It reads the question rowset and total vote score, then
// renders the Stack Overflow "All Questions" header, the filter tabs, the
// question rows (stat rail + title + excerpt + tags + user card), and the
// ask-a-question composer.
type QuestionListQueryResult = Awaited<ReturnType<typeof questionList.load>>;
type QuestionScoreQueryResult = Awaited<ReturnType<typeof questionScore.load>>;
type QuestionListRenderSlots = ComponentRenderSlots<{ postQuestion: typeof postQuestionForm }> & {
request?: SoRequest | undefined;
};
interface DuplicateTitleFailure {
code: 'DUPLICATE_TITLE';
payload: { title: string };
}
const defaultQuestionListRenderSlots: QuestionListRenderSlots = {
forms: { postQuestion: { failure: null } },
};
const listStyles = style.create({
// ---- Page header ---------------------------------------------------------
pageHead: {
alignItems: 'center',
display: 'flex',
gap: 16,
justifyContent: 'space-between',
marginBlockEnd: 12,
},
pageTitle: {
color: '#0c0d0e',
fontSize: 27,
fontWeight: 400,
margin: 0,
},
askButton: {
backgroundColor: '#0a95ff',
borderColor: '#0a95ff',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
color: '#ffffff',
flexShrink: 0,
fontSize: 13,
paddingBlock: 10,
paddingInline: 11,
textDecoration: 'none',
':hover': { backgroundColor: '#0074cc' },
},
subHead: {
alignItems: 'center',
display: 'flex',
flexWrap: 'wrap',
gap: 12,
justifyContent: 'space-between',
marginBlockEnd: 16,
},
count: {
color: '#232629',
fontSize: 17,
},
// ---- Filter tabs ---------------------------------------------------------
tabs: {
borderColor: '#d6d9dc',
borderRadius: 6,
borderStyle: 'solid',
borderWidth: 1,
display: 'inline-flex',
overflow: 'hidden',
},
tab: {
borderInlineStartColor: '#d6d9dc',
borderInlineStartStyle: 'solid',
borderInlineStartWidth: 1,
color: '#525960',
fontSize: 13,
paddingBlock: 8,
paddingInline: 11,
textDecoration: 'none',
':hover': { backgroundColor: '#f8f9f9', color: '#232629' },
},
tabFirst: {
borderInlineStartWidth: 0,
},
tabActive: {
backgroundColor: '#f1f2f3',
color: '#232629',
},
// ---- Question rows -------------------------------------------------------
list: {
borderTopColor: '#e3e6e8',
borderTopStyle: 'solid',
borderTopWidth: 1,
listStyle: 'none',
margin: 0,
padding: 0,
},
row: {
borderBottomColor: '#e3e6e8',
borderBottomStyle: 'solid',
borderBottomWidth: 1,
display: 'flex',
gap: 16,
paddingBlock: 16,
},
stats: {
color: '#525960',
display: 'flex',
flexDirection: 'column',
flexShrink: 0,
fontSize: 13,
gap: 8,
paddingTop: 2,
width: 90,
},
statVotes: {
alignItems: 'center',
display: 'flex',
flexDirection: 'column',
gap: 3,
},
statVotesLabel: {
color: '#525960',
fontSize: 13,
lineHeight: 1,
},
statBox: {
alignItems: 'center',
borderColor: '#2f6f44',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
color: '#2f6f44',
display: 'flex',
flexDirection: 'column',
gap: 2,
paddingBlock: 4,
paddingInline: 6,
},
statBoxNum: {
fontSize: 15,
fontVariantNumeric: 'tabular-nums',
fontWeight: 400,
lineHeight: 1,
},
statBoxLabel: {
fontSize: 12,
lineHeight: 1,
},
statPlain: {
alignItems: 'center',
color: '#525960',
display: 'flex',
flexDirection: 'column',
gap: 2,
paddingBlock: 4,
},
statViews: {
color: '#6a737c',
fontSize: 12,
textAlign: 'center',
},
rowMain: {
display: 'grid',
flex: '1 1 0%',
gap: 6,
minWidth: 0,
},
rowTitle: {
color: '#0074cc',
fontSize: 17,
fontWeight: 400,
lineHeight: 1.3,
textDecoration: 'none',
':hover': { color: '#0a95ff' },
},
rowExcerpt: {
color: '#525960',
display: '-webkit-box',
fontSize: 13,
lineHeight: 1.5,
margin: 0,
overflow: 'hidden',
WebkitBoxOrient: 'vertical',
WebkitLineClamp: 2,
},
rowMeta: {
alignItems: 'flex-end',
columnGap: 12,
display: 'flex',
flexWrap: 'wrap',
justifyContent: 'space-between',
marginBlockStart: 4,
rowGap: 8,
},
// ---- Ask composer --------------------------------------------------------
composer: {
backgroundColor: '#fdf7e3',
borderColor: '#f1e5bc',
borderRadius: 6,
borderStyle: 'solid',
borderWidth: 1,
display: 'grid',
gap: 10,
marginBlockStart: 28,
padding: 16,
},
composerTitle: {
color: '#0c0d0e',
fontSize: 15,
fontWeight: 600,
margin: 0,
},
composerHint: {
color: '#525960',
fontSize: 13,
marginBlock: 0,
},
label: {
color: '#0c0d0e',
fontSize: 14,
fontWeight: 600,
},
input: {
backgroundColor: '#ffffff',
borderColor: '#d6d9dc',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
boxSizing: 'border-box',
color: '#0c0d0e',
fontSize: 13,
paddingBlock: 9,
paddingInline: 11,
width: '100%',
':focus': {
borderColor: '#0a95ff',
boxShadow: '0 0 0 4px rgba(10,149,255,0.15)',
outline: 'none',
},
},
textarea: {
lineHeight: 1.5,
resize: 'vertical',
},
composerActions: {
display: 'flex',
justifyContent: 'flex-start',
},
submitButton: {
backgroundColor: '#0a95ff',
borderColor: '#0a95ff',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
color: '#ffffff',
fontSize: 13,
paddingBlock: 10,
paddingInline: 11,
':hover': { backgroundColor: '#0074cc' },
},
error: {
color: '#c22e32',
fontSize: 13,
},
});
export const questionListStyleCss = style.emitAtomicCss(
Object.values(listStyles).flatMap((entry) => entry.__rules ?? []),
);
function renderAnswerStat(answerCount: number): string {
if (answerCount > 0) {
return (
<div style={listStyles.statBox}>
<span style={listStyles.statBoxNum}>{answerCount}</span>
<span style={listStyles.statBoxLabel}>{answerCount === 1 ? 'answer' : 'answers'}</span>
</div>
);
}
return (
<div style={listStyles.statPlain}>
<span style={listStyles.statBoxNum}>0</span>
<span style={listStyles.statBoxLabel}>answers</span>
</div>
);
}
function renderQuestionRow(question: QuestionListItem): string {
const tags = parseTags(question.tags);
const views = viewsFor(question.id, question.score);
return (
<li kovo-key={question.id} style={listStyles.row}>
<div style={listStyles.stats}>
<div style={listStyles.statVotes}>
{voteButton(question.id, question.score)}
<span style={listStyles.statVotesLabel}>votes</span>
</div>
{renderAnswerStat(question.answerCount)}
<span style={listStyles.statViews}>{`${compactCount(views)} views`}</span>
</div>
<div style={listStyles.rowMain}>
<a style={listStyles.rowTitle} href={`/questions/${question.id}`}>
{question.title}
</a>
{question.body ? <p style={listStyles.rowExcerpt}>{question.body}</p> : ''}
<div style={listStyles.rowMeta}>
{renderTags(tags)}
{renderUserCard(question.authorName, question.createdAt, 'asked')}
</div>
</div>
</li>
);
}
// Interactive region rendered inside the full page and fragment responses.
export const QuestionListRegion = component({
mutations: { postQuestion: postQuestionForm },
queries: { questionList, questionScore },
render: (
{
questionList,
questionScore,
}: {
questionList: QuestionListQueryResult;
questionScore: QuestionScoreQueryResult;
},
_state,
_slots: QuestionListRenderSlots = defaultQuestionListRenderSlots,
) => {
const questions = questionList.items;
const totalVotes = questionScore.score;
return (
<div>
<div style={listStyles.pageHead}>
<h1 style={listStyles.pageTitle}>All Questions</h1>
<a href="#ask-question" style={listStyles.askButton}>
Ask Question
</a>
</div>
<div style={listStyles.subHead}>
<span style={listStyles.count}>{questions.length.toLocaleString('en-US')} questions</span>
<div style={listStyles.tabs}>
<a href="/" style={[listStyles.tab, listStyles.tabFirst, listStyles.tabActive]}>
Newest
</a>
<a href="/" style={listStyles.tab}>
Active
</a>
<a href="/" style={listStyles.tab}>
Bountied
</a>
<a href="/" style={listStyles.tab}>
Unanswered
</a>
</div>
</div>
<ul style={listStyles.list}>{questions.map((question) => renderQuestionRow(question))}</ul>
{/* Native form; enhanced submissions refresh this whole region. */}
<form enhance mutation={postQuestionMutation} id="ask-question" style={listStyles.composer}>
<input type="hidden" name="id" value={freshId('q')} />
<input type="hidden" name="authorId" value="demo-viewer" />
<p style={listStyles.composerTitle}>Ask a public question</p>
<p style={listStyles.composerHint}>
{totalVotes} votes cast across the community — be specific and imagine you're asking
another person.
</p>
<label style={listStyles.label} for="ask-title">
Title
</label>
<input
id="ask-title"
name="title"
required
placeholder="e.g. How do I center a div with flexbox?"
style={listStyles.input}
/>
<label style={listStyles.label} for="ask-body">
Body
</label>
<textarea
id="ask-body"
name="body"
required
rows="3"
placeholder="Include all the information someone would need to answer your question…"
style={[listStyles.input, listStyles.textarea]}
/>
<FormError
code="DUPLICATE_TITLE"
style={listStyles.error}
message={(failure: DuplicateTitleFailure) =>
`A question titled "${failure.payload.title}" already exists.`
}
/>
<div style={listStyles.composerActions}>
<button type="submit" style={listStyles.submitButton}>
Post your question
</button>
</div>
</form>
</div>
);
},
});
/** @jsxImportSource @kovojs/server */
import { component } from '@kovojs/core';
import * as style from '@kovojs/style';
import { postAnswerMutation } from '../mutations.js';
import { questionAnswers, questionDetail } from '../queries.js';
import type { QuestionAnswersResult, QuestionDetailResult, SoRequest } from '../model.js';
import {
compactCount,
freshId,
parseTags,
relativeTime,
renderTags,
renderUserCard,
viewsFor,
voteButton,
} from '../components/chrome.js';
// Question detail for `/questions/:id`: the question post, its answers, and the
// answer composer — laid out like a Stack Overflow question page (vote gutter,
// post body, tags, user card, then the answer list and "Your Answer" form).
const detailStyles = style.create({
// ---- Question header -----------------------------------------------------
header: {
borderBottomColor: '#e3e6e8',
borderBottomStyle: 'solid',
borderBottomWidth: 1,
paddingBlockEnd: 12,
},
titleRow: {
alignItems: 'flex-start',
display: 'flex',
gap: 16,
justifyContent: 'space-between',
},
detailTitle: {
color: '#0c0d0e',
fontSize: 27,
fontWeight: 400,
lineHeight: 1.3,
margin: 0,
},
askButton: {
backgroundColor: '#0a95ff',
borderColor: '#0a95ff',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
color: '#ffffff',
flexShrink: 0,
fontSize: 13,
paddingBlock: 10,
paddingInline: 11,
textDecoration: 'none',
':hover': { backgroundColor: '#0074cc' },
},
metaRow: {
color: '#525960',
display: 'flex',
flexWrap: 'wrap',
fontSize: 13,
gap: 16,
marginBlockStart: 8,
},
metaLabel: { color: '#6a737c' },
metaValue: { color: '#232629' },
// ---- Post (question + answer) layout ------------------------------------
post: {
borderBottomColor: '#e3e6e8',
borderBottomStyle: 'solid',
borderBottomWidth: 1,
display: 'flex',
gap: 16,
paddingBlock: 16,
},
gutter: {
alignItems: 'center',
display: 'flex',
flexDirection: 'column',
flexShrink: 0,
gap: 2,
width: 42,
},
acceptMark: {
color: '#3d8b5f',
fontSize: 28,
lineHeight: 1,
marginBlockStart: 4,
},
postMain: {
display: 'grid',
flex: '1 1 0%',
gap: 14,
minWidth: 0,
},
body: {
color: '#0c0d0e',
fontSize: 15,
lineHeight: 1.65,
margin: 0,
whiteSpace: 'pre-wrap',
},
postFooter: {
alignItems: 'flex-end',
display: 'flex',
flexWrap: 'wrap',
gap: 12,
justifyContent: 'space-between',
},
// ---- Answers -------------------------------------------------------------
answersHead: {
alignItems: 'center',
display: 'flex',
gap: 12,
justifyContent: 'space-between',
marginBlockStart: 24,
},
answersTitle: {
color: '#0c0d0e',
fontSize: 19,
fontWeight: 400,
margin: 0,
},
answerList: {
listStyle: 'none',
margin: 0,
padding: 0,
},
acceptedNote: {
alignItems: 'center',
color: '#3d8b5f',
display: 'inline-flex',
fontSize: 13,
fontWeight: 600,
gap: 4,
},
// ---- Answer composer -----------------------------------------------------
composer: {
display: 'grid',
gap: 12,
marginBlockStart: 28,
},
composerTitle: {
color: '#0c0d0e',
fontSize: 19,
fontWeight: 400,
margin: 0,
},
input: {
backgroundColor: '#ffffff',
borderColor: '#d6d9dc',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
boxSizing: 'border-box',
color: '#0c0d0e',
fontSize: 13,
paddingBlock: 9,
paddingInline: 11,
width: '100%',
':focus': {
borderColor: '#0a95ff',
boxShadow: '0 0 0 4px rgba(10,149,255,0.15)',
outline: 'none',
},
},
textarea: {
lineHeight: 1.5,
resize: 'vertical',
},
composerActions: {
display: 'flex',
justifyContent: 'flex-start',
},
submitButton: {
backgroundColor: '#0a95ff',
borderColor: '#0a95ff',
borderRadius: 4,
borderStyle: 'solid',
borderWidth: 1,
color: '#ffffff',
fontSize: 13,
paddingBlock: 10,
paddingInline: 11,
':hover': { backgroundColor: '#0074cc' },
},
// ---- Not-found ----------------------------------------------------------
notFound: {
color: '#525960',
fontSize: 15,
paddingBlock: 24,
},
back: {
alignItems: 'center',
color: '#0074cc',
display: 'inline-flex',
fontSize: 13,
gap: 6,
marginBlockEnd: 12,
textDecoration: 'none',
':hover': { color: '#0a95ff' },
},
});
export const questionDetailStyleCss = style.emitAtomicCss(
Object.values(detailStyles).flatMap((entry) => entry.__rules ?? []),
);
function renderQuestionPost(question: QuestionDetailResult): string {
const tags = parseTags(question.tags);
return (
<div style={detailStyles.post}>
<div style={detailStyles.gutter}>{voteButton(question.id, question.score)}</div>
<div style={detailStyles.postMain}>
<p style={detailStyles.body}>{question.body}</p>
<div style={detailStyles.postFooter}>
{renderTags(tags)}
{question.authorName
? renderUserCard(question.authorName, question.createdAt, 'asked')
: ''}
</div>
</div>
</div>
);
}
function renderAnswerPost(answer: QuestionAnswersResult[number]): string {
return (
<li kovo-key={answer.id} style={detailStyles.post}>
<div style={detailStyles.gutter}>
<span style={detailStyles.body} />
{/* Answer scores are static in the demo (only questions are votable). */}
{answer.accepted ? <span style={detailStyles.acceptMark}>✓</span> : ''}
</div>
<div style={detailStyles.postMain}>
{answer.accepted ? (
<span style={detailStyles.acceptedNote}>
<span>✓</span> Accepted answer
</span>
) : (
''
)}
<p style={detailStyles.body}>{answer.body}</p>
<div style={detailStyles.postFooter}>
<span />
{answer.authorName ? renderUserCard(answer.authorName, answer.createdAt, 'answered') : ''}
</div>
</div>
</li>
);
}
// Interactive region rendered inside the full page and fragment responses.
export const QuestionDetailRegion = component({
props: { questionId: String },
queries: {
answers: questionAnswers.args((props) => ({ questionId: props.questionId })),
question: questionDetail.args((props) => ({ id: props.questionId })),
},
render: (
{
answers,
question,
questionId,
}: {
answers: QuestionAnswersResult;
question: QuestionDetailResult | null;
questionId: string;
},
_state,
_slots: { request?: SoRequest | undefined } = {},
) => {
if (!question) {
return (
<div>
<a style={detailStyles.back} href="/">
← All questions
</a>
<h1 style={detailStyles.detailTitle}>Question not found</h1>
<p style={detailStyles.notFound}>
This question does not exist (it may have been a demo that reset).
</p>
</div>
);
}
const views = viewsFor(question.id, question.score);
const asked = question.createdAt ? relativeTime(question.createdAt) : 'recently';
return (
<div>
<div style={detailStyles.header}>
<div style={detailStyles.titleRow}>
<h1 style={detailStyles.detailTitle}>{question.title}</h1>
<a href="#your-answer" style={detailStyles.askButton}>
Ask Question
</a>
</div>
<div style={detailStyles.metaRow}>
<span>
<span style={detailStyles.metaLabel}>Asked</span>{' '}
<span style={detailStyles.metaValue}>{asked}</span>
</span>
<span>
<span style={detailStyles.metaLabel}>Viewed</span>{' '}
<span style={detailStyles.metaValue}>{`${compactCount(views)} times`}</span>
</span>
</div>
</div>
{renderQuestionPost(question)}
<div style={detailStyles.answersHead}>
<h2 style={detailStyles.answersTitle}>
{question.answerCount} {question.answerCount === 1 ? 'Answer' : 'Answers'}
</h2>
</div>
<ul style={detailStyles.answerList}>{answers.map(renderAnswerPost)}</ul>
{/* Native form; enhanced submissions refresh this whole region. */}
<form enhance mutation={postAnswerMutation} id="your-answer" style={detailStyles.composer}>
<input type="hidden" name="id" value={freshId('a')} />
<input type="hidden" name="questionId" value={questionId} />
<input type="hidden" name="authorId" value="demo-viewer" />
<h2 style={detailStyles.composerTitle}>Your Answer</h2>
<textarea
id="answer-body"
name="body"
required
rows="6"
placeholder="Share what you know — code and reasoning welcome…"
style={[detailStyles.input, detailStyles.textarea]}
/>
<div style={detailStyles.composerActions}>
<button type="submit" style={detailStyles.submitButton}>
Post Your Answer
</button>
</div>
</form>
</div>
);
},
});
import { query, s, type QueryLoadContext } from '@kovojs/server';
import { asc, eq, sum } from 'drizzle-orm';
import type { SoDb } from './db.js';
import {
answer,
question,
vote,
type QuestionAnswersResult,
type QuestionDetailResult,
type SoRequest,
} from './model.js';
import { answers, questions, votes } from './schema.js';
// Typed reads for the demo. The Drizzle selects stay inline so the generated
// StackOverflow artifacts can inspect the query shapes.
type SoQueryLoadContext = QueryLoadContext<SoRequest> & { db?: SoDb };
// The list is ordered by stable id so a vote changes the score without reshuffling
// rows while a fragment response is being applied.
export const questionList = query('questionList', {
load: async (_input: unknown, context?: SoQueryLoadContext) => {
const db = requireSoQueryDb(context);
const items = await db
.select({
authorId: questions.authorId,
authorName: questions.authorName,
body: questions.body,
createdAt: questions.createdAt,
id: questions.id,
tags: questions.tags,
title: questions.title,
score: questions.score,
answerCount: questions.answerCount,
})
.from(questions)
.orderBy(questions.id);
// Keep the explicit property for the artifact generator.
return { items: items };
},
reads: [question],
});
// All answers, ordered by stable id.
export const answerList = query('answerList', {
load: async (_input: unknown, context?: SoQueryLoadContext) => {
const db = requireSoQueryDb(context);
const items = await db
.select({
id: answers.id,
questionId: answers.questionId,
body: answers.body,
score: answers.score,
})
.from(answers)
.orderBy(answers.id);
return { items: items };
},
reads: [answer],
});
export const questionDetail = query('questionDetail', {
args: s.object({ id: s.string() }),
load: async (
input: { id: string },
context?: SoQueryLoadContext,
): Promise<QuestionDetailResult | null> => {
const db = requireSoQueryDb(context);
const [row] = await db
.select({
id: questions.id,
title: questions.title,
body: questions.body,
authorId: questions.authorId,
score: questions.score,
answerCount: questions.answerCount,
authorName: questions.authorName,
tags: questions.tags,
createdAt: questions.createdAt,
})
.from(questions)
.where(eq(questions.id, input.id))
.limit(1);
return row ?? null;
},
reads: [question],
});
export const questionAnswers = query('questionAnswers', {
args: s.object({ questionId: s.string() }),
load: async (
input: { questionId: string },
context?: SoQueryLoadContext,
): Promise<QuestionAnswersResult> => {
const db = requireSoQueryDb(context);
return db
.select({
id: answers.id,
questionId: answers.questionId,
body: answers.body,
score: answers.score,
accepted: answers.accepted,
authorId: answers.authorId,
authorName: answers.authorName,
createdAt: answers.createdAt,
})
.from(answers)
.where(eq(answers.questionId, input.questionId))
.orderBy(asc(answers.id));
},
reads: [answer],
});
// Total score across all question votes.
export const questionScore = query('questionScore', {
load: async (_input: unknown, context?: SoQueryLoadContext) => {
const db = requireSoQueryDb(context);
const rows = await db.select({ value: sum(votes.value) }).from(votes);
return { score: Number(rows[0]?.value ?? 0) };
},
reads: [vote],
});
function requireSoQueryDb(context?: SoQueryLoadContext): SoDb {
const db = context?.db ?? context?.request?.db;
if (!db) {
throw new Error('stackoverflow query loaders require context.db or request.db');
}
return db;
}
import { mutation, s, type MutationContext } from '@kovojs/server';
import { eq, sql } from 'drizzle-orm';
import { answer, question, vote, type SoRequest } from './model.js';
import { answers, questions, votes } from './schema.js';
// Top-level mutation handlers for the demo. Drizzle writes stay inline so the
// generated StackOverflow artifacts can read the write effects.
// Insert a new question; score and answer count start at zero.
export async function postQuestion(
{ id, title, body, authorId }: { id: string; title: string; body: string; authorId: string },
request: SoRequest,
context: MutationContext<{ DUPLICATE_TITLE: typeof duplicateTitleError }>,
) {
const db = request.db;
const [existing] = await db.select().from(questions).where(eq(questions.title, title)).limit(1);
if (existing) {
return context.fail('DUPLICATE_TITLE', { title });
}
await db.insert(questions).values({
answerCount: 0,
authorId,
authorName: 'Anonymous',
body,
createdAt: '',
id,
score: 0,
tags: '',
title,
});
return { id };
}
// Insert an answer and bump the question's answer count.
export async function postAnswer(
{
id,
questionId,
body,
authorId,
}: { id: string; questionId: string; body: string; authorId: string },
request: SoRequest,
): Promise<{ id: string }> {
const db = request.db;
await db.insert(answers).values({ id, questionId, body, authorId, score: 0, accepted: false });
await db
.update(questions)
.set({ answerCount: sql`${questions.answerCount} + ${1}` })
.where(eq(questions.id, questionId));
return { id };
}
// Insert an upvote and bump the target question's score.
export async function voteUp(
{ id, targetId, userId }: { id: string; targetId: string; userId: string },
request: SoRequest,
): Promise<{ id: string }> {
const db = request.db;
await db.insert(votes).values({ targetType: 'question', targetId, userId, value: 1 });
await db
.update(questions)
.set({ score: sql`${questions.score} + ${1}` })
.where(eq(questions.id, targetId));
return { id };
}
// mutation() definitions used by the app shell and generated graph.
export interface SoCsrfRequest {
session?: { id?: string } | null;
}
export const EXAMPLE_ONLY_SO_CSRF_SECRET = 'stackoverflow-reference-demo-csrf-secret';
export const soCsrf = {
field: 'csrf',
secret: EXAMPLE_ONLY_SO_CSRF_SECRET,
sessionId(request: SoCsrfRequest) {
return request.session?.id;
},
};
const duplicateTitleError = s.object({ title: s.string() });
export const postQuestionMutation = mutation('postQuestion', {
input: s.object({
id: s.string(),
title: s.string(),
body: s.string(),
authorId: s.string(),
}),
csrf: soCsrf,
errors: {
DUPLICATE_TITLE: duplicateTitleError,
},
registry: { touches: [question] },
handler: postQuestion,
});
export const postAnswerMutation = mutation('postAnswer', {
input: s.object({
id: s.string(),
questionId: s.string(),
body: s.string(),
authorId: s.string(),
}),
csrf: soCsrf,
registry: { touches: [answer, question] },
handler: postAnswer,
});
export const voteUpMutation = mutation('voteUp', {
input: s.object({
id: s.string(),
targetId: s.string(),
userId: s.string(),
}),
csrf: soCsrf,
registry: { touches: [vote, question] },
handler: voteUp,
});
// DO NOT EDIT — generated by @kovojs/drizzle derived optimism (SPEC.md §10.5).
// Override a transform by declaring it in the mutation module; deleting the
// override lets derivation take this pair back over, pair by pair (SPEC.md §10.4).
import type { OptimisticFor } from '@kovojs/runtime';
import type { voteUpForm } from '../../model.js';
export const voteUpDerivedOptimistic = {
queue: 'vote',
transforms: {
questionList: (current, $input) => {
const next = structuredClone(current);
{
const target = next.items.find((entry) => entry.id === $input.targetId);
if (target) {
target.score = (target.score + 1);
}
}
return next;
},
questionScore: (current, _$input) => {
const next = structuredClone(current);
next.score = (next.score ?? 0) + 1;
return next;
},
questionDetail: 'await-fragment',
},
} satisfies OptimisticFor<typeof voteUpForm>;