db: expose isDbError() utility

.changeset/unlucky-pumas-retire.md

@@ -0,0 +1,5 @@
+---
+"@astrojs/db": patch
+---
+
+Expose `isDbError()` utility to handle database exceptions when querying.

packages/db/src/runtime/config.ts

@@ -9,6 +9,7 @@ import type {
 	TableConfig,
 	TextColumnOpts,
 } from '../core/types.js';
+import { LibsqlError } from '@libsql/client';
 
 export type { LibSQLDatabase } from 'drizzle-orm/libsql';
 
@@ -22,6 +23,10 @@ function createColumn<S extends string, T extends Record<string, unknown>>(type:
 	};
 }
 
+export function isDbError(err: unknown): err is LibsqlError {
+	return err instanceof LibsqlError;
+}
+
 export const column = {
 	number: <T extends NumberColumnOpts>(opts: T = {} as T) => {
 		return createColumn('number', opts) satisfies { type: 'number' };

packages/db/test/error-handling.test.js

@@ -0,0 +1,42 @@
+import { expect } from 'chai';
+import { loadFixture } from '../../astro/test/test-utils.js';
+
+const foreignKeyConstraintError =
+	'LibsqlError: SQLITE_CONSTRAINT_FOREIGNKEY: FOREIGN KEY constraint failed';
+
+describe('astro:db - error handling', () => {
+	let fixture;
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/error-handling/', import.meta.url),
+		});
+	});
+
+	describe('development', () => {
+		let devServer;
+
+		before(async () => {
+			devServer = await fixture.startDevServer();
+		});
+
+		after(async () => {
+			await devServer.stop();
+		});
+
+		it('Raises foreign key constraint LibsqlError', async () => {
+			const json = await fixture.fetch('/foreign-key-constraint.json').then((res) => res.json());
+			expect(json.error).to.equal(foreignKeyConstraintError);
+		});
+	});
+
+	describe('build', () => {
+		before(async () => {
+			await fixture.build();
+		});
+
+		it('Raises foreign key constraint LibsqlError', async () => {
+			const json = await fixture.readFile('/foreign-key-constraint.json');
+			expect(JSON.parse(json).error).to.equal(foreignKeyConstraintError);
+		});
+	});
+});

packages/db/test/fixtures/error-handling/astro.config.ts

@@ -0,0 +1,10 @@
+import db from '@astrojs/db';
+import { defineConfig } from 'astro/config';
+
+// https://astro.build/config
+export default defineConfig({
+	integrations: [db()],
+	devToolbar: {
+		enabled: false,
+	},
+});

packages/db/test/fixtures/error-handling/db/config.ts

@@ -0,0 +1,26 @@
+import { column, defineDb, defineTable } from 'astro:db';
+
+const Recipe = defineTable({
+	columns: {
+		id: column.number({ primaryKey: true }),
+		title: column.text(),
+		description: column.text(),
+	},
+});
+
+const Ingredient = defineTable({
+	columns: {
+		id: column.number({ primaryKey: true }),
+		name: column.text(),
+		quantity: column.number(),
+		recipeId: column.number(),
+	},
+	indexes: {
+		recipeIdx: { on: 'recipeId' },
+	},
+	foreignKeys: [{ columns: 'recipeId', references: () => [Recipe.columns.id] }],
+});
+
+export default defineDb({
+	tables: { Recipe, Ingredient },
+});

packages/db/test/fixtures/error-handling/db/seed.ts

@@ -0,0 +1,62 @@
+import { Ingredient, Recipe, db } from 'astro:db';
+
+export default async function () {
+	const pancakes = await db
+		.insert(Recipe)
+		.values({
+			title: 'Pancakes',
+			description: 'A delicious breakfast',
+		})
+		.returning()
+		.get();
+
+	await db.insert(Ingredient).values([
+		{
+			name: 'Flour',
+			quantity: 1,
+			recipeId: pancakes.id,
+		},
+		{
+			name: 'Eggs',
+			quantity: 2,
+			recipeId: pancakes.id,
+		},
+		{
+			name: 'Milk',
+			quantity: 1,
+			recipeId: pancakes.id,
+		},
+	]);
+
+	const pizza = await db
+		.insert(Recipe)
+		.values({
+			title: 'Pizza',
+			description: 'A delicious dinner',
+		})
+		.returning()
+		.get();
+
+	await db.insert(Ingredient).values([
+		{
+			name: 'Flour',
+			quantity: 1,
+			recipeId: pizza.id,
+		},
+		{
+			name: 'Eggs',
+			quantity: 2,
+			recipeId: pizza.id,
+		},
+		{
+			name: 'Milk',
+			quantity: 1,
+			recipeId: pizza.id,
+		},
+		{
+			name: 'Tomato Sauce',
+			quantity: 1,
+			recipeId: pizza.id,
+		},
+	]);
+}

packages/db/test/fixtures/error-handling/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@test/error-handling",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview"
+  },
+  "dependencies": {
+    "@astrojs/db": "workspace:*",
+    "astro": "workspace:*"
+  }
+}

packages/db/test/fixtures/error-handling/src/pages/foreign-key-constraint.json.ts

@@ -0,0 +1,18 @@
+import type { APIRoute } from 'astro';
+import { db, Ingredient, isDbError } from 'astro:db';
+
+export const GET: APIRoute = async () => {
+	try {
+		await db.insert(Ingredient).values({
+			name: 'Flour',
+			quantity: 1,
+			// Trigger foreign key constraint error
+			recipeId: 42,
+		});
+	} catch (e) {
+		if (isDbError(e)) {
+			return new Response(JSON.stringify({ error: `LibsqlError: ${e.message}` }));
+		}
+	}
+	return new Response(JSON.stringify({ error: 'Did not raise expected exception' }));
+};

packages/db/virtual.d.ts

@@ -11,6 +11,7 @@ declare module 'astro:db' {
 	export const column: RuntimeConfig['column'];
 	export const defineDb: RuntimeConfig['defineDb'];
 	export const defineTable: RuntimeConfig['defineTable'];
+	export const isDbError: RuntimeConfig['isDbError'];
 
 	export const eq: RuntimeConfig['eq'];
 	export const gt: RuntimeConfig['gt'];