fix: mysql returning failing on update

demo/nextjs/lib/auth.ts

@@ -13,6 +13,8 @@ import { reactInvitationEmail } from "./email/invitation";
 import { LibsqlDialect } from "@libsql/kysely-libsql";
 import { reactResetPasswordEmail } from "./email/rest-password";
 import { resend } from "./email/resend";
+import { MysqlDialect } from "kysely";
+import { createPool } from "mysql2/promise";
 
 const from = process.env.BETTER_AUTH_EMAIL || "delivered@resend.dev";
 const to = process.env.TEST_EMAIL || "";
@@ -22,11 +24,15 @@ const libsql = new LibsqlDialect({
 	authToken: process.env.TURSO_AUTH_TOKEN || "",
 });
 
+const mysql = new MysqlDialect(
+	createPool("mysql://user:password@localhost:3306/better_auth"),
+);
+
 export const auth = betterAuth({
 	appName: "Better Auth Demo",
 	database: {
-		dialect: libsql,
-		type: "sqlite",
+		dialect: mysql,
+		type: "mysql",
 	},
 	session: {
 		cookieCache: {

demo/nextjs/package.json

@@ -64,11 +64,12 @@
     "kysely": "^0.27.4",
     "lucide-react": "^0.439.0",
     "mini-svg-data-uri": "^1.4.4",
+    "mysql2": "^3.11.0",
     "next": "15.0.0-rc.1",
     "next-themes": "^0.3.0",
     "prisma": "^5.19.1",
-    "react-day-picker": "8.10.1",
     "react": "^18.3.1",
+    "react-day-picker": "8.10.1",
     "react-dom": "^18.3.1",
     "react-hook-form": "^7.53.0",
     "react-qr-code": "^2.0.15",

packages/better-auth/src/adapters/kysely-adapter/kysely-adapter.ts

@@ -19,6 +19,23 @@ interface KyselyAdapterConfig {
 	generateId?: ((size?: number) => string) | false;
 }
 
+function formatDateForMySQL(date: Date): string {
+	const pad = (n: number) => (n < 10 ? "0" + n : n);
+	return (
+		date.getFullYear() +
+		"-" +
+		pad(date.getMonth() + 1) +
+		"-" +
+		pad(date.getDate()) +
+		" " +
+		pad(date.getHours()) +
+		":" +
+		pad(date.getMinutes()) +
+		":" +
+		pad(date.getSeconds())
+	);
+}
+
 const createTransform = (
 	db: Kysely<any>,
 	options: BetterAuthOptions,
@@ -43,7 +60,10 @@ const createTransform = (
 		if (f.type === "boolean" && type === "sqlite") {
 			return value ? 1 : 0;
 		}
-		if (f.type === "date" && value) {
+		if (f.type === "date" && value && value instanceof Date) {
+			if (type === "mysql") {
+				return formatDateForMySQL(value);
+			}
 			return value.toISOString();
 		}
 		return value;
@@ -62,6 +82,10 @@ const createTransform = (
 		return value;
 	}
 
+	function getModelName(model: string) {
+		return schema[model].tableName;
+	}
+
 	const shouldGenerateId = config?.generateId !== false;
 	return {
 		transformInput(data: Record<string, any>, model: string) {
@@ -194,25 +218,25 @@ const createTransform = (
 				| InsertQueryBuilder<any, any, any>
 				| UpdateQueryBuilder<any, string, string, any>,
 			model: string,
+			where: Where[],
 		) {
 			let res: any;
 			if (config?.type !== "mysql") {
 				res = await builder.returningAll().executeTakeFirst();
 			} else {
+				//this isn't good, but kysely doesn't support returning in mysql and it doesn't return the inserted id. Change this if there is a better way.
 				await builder.execute();
-				const primaryKey = "id";
-				const insertedId = values[primaryKey];
+				const field = values.id ? "id" : where[0].field ? where[0].field : "id";
+				const value = values[field] || where[0].value;
 				res = await db
-					.selectFrom(this.getModelName(model))
+					.selectFrom(getModelName(model))
 					.selectAll()
-					.where(primaryKey, "=", insertedId)
+					.where(getField(model, field), "=", value)
 					.executeTakeFirst();
 			}
 			return res;
 		},
-		getModelName(model: string) {
-			return schema[model].tableName;
-		},
+		getModelName,
 		getField,
 	};
 };
@@ -235,7 +259,7 @@ export const kyselyAdapter =
 				const transformed = transformInput(values, model);
 				const builder = db.insertInto(getModelName(model)).values(transformed);
 				return transformOutput(
-					await withReturning(transformed, builder, model),
+					await withReturning(transformed, builder, model, []),
 					model,
 					select,
 				);
@@ -257,7 +281,7 @@ export const kyselyAdapter =
 			async findMany(data) {
 				const { model, where, limit, offset, sortBy } = data;
 				const { and, or } = convertWhereClause(model, where);
-				let query = db.selectFrom(getModelName(model)).selectAll();
+				let query = db.selectFrom(getModelName(model));
 				if (and) {
 					query = query.where((eb) => eb.and(and.map((expr) => expr(eb))));
 				}
@@ -265,7 +289,9 @@ export const kyselyAdapter =
 					query = query.where((eb) => eb.or(or.map((expr) => expr(eb))));
 				}
 				query = query.limit(limit || 100);
-				if (offset) query = query.offset(offset);
+				if (offset) {
+					query = query.offset(offset);
+				}
 				if (sortBy) {
 					query = query.orderBy(
 						getField(model, sortBy.field),
@@ -288,7 +314,7 @@ export const kyselyAdapter =
 					query = query.where((eb) => eb.or(or.map((expr) => expr(eb))));
 				}
 				return transformOutput(
-					await withReturning(transformedData, query, model),
+					await withReturning(transformedData, query, model, where),
 					model,
 				);
 			},

packages/better-auth/src/adapters/kysely-adapter/test/adapter.kysley.test.ts

@@ -1,17 +1,28 @@
 import fs from "fs/promises";
-import { afterAll, beforeEach, describe, expect, it } from "vitest";
+import { afterAll, beforeAll, beforeEach, describe, expect, it } from "vitest";
 import { runAdapterTest } from "../../test";
 import { getMigrations } from "../../../db/get-migration";
 import path from "path";
 import Database from "better-sqlite3";
 import { kyselyAdapter } from "..";
-import { Kysely, SqliteDialect } from "kysely";
+import { Kysely, MysqlDialect, SqliteDialect } from "kysely";
 import type { BetterAuthOptions } from "../../../types";
+import { createPool } from "mysql2/promise";
 
 describe("adapter test", async () => {
-	const database = new Database(path.join(__dirname, "test.db"));
-	const opts = {
-		database,
+	const sqlite = new Database(path.join(__dirname, "test.db"));
+	const mysql = createPool("mysql://user:password@localhost:3306/better_auth");
+	const sqliteKy = new Kysely({
+		dialect: new SqliteDialect({
+			database: sqlite,
+		}),
+	});
+	const mysqlKy = new Kysely({
+		dialect: new MysqlDialect(mysql),
+	});
+	const opts = (database: BetterAuthOptions["database"]) =>
+		({
+			database: database,
 			user: {
 				fields: {
 					email: "email_address",
@@ -20,23 +31,41 @@ describe("adapter test", async () => {
 			session: {
 				modelName: "sessions",
 			},
-	} satisfies BetterAuthOptions;
-	beforeEach(async () => {
-		const { runMigrations } = await getMigrations(opts);
+		}) satisfies BetterAuthOptions;
+	const mysqlOptions = opts({
+		db: mysqlKy,
+		type: "mysql",
+	});
+	const sqliteOptions = opts({
+		db: sqliteKy,
+		type: "sqlite",
+	});
+	beforeAll(async () => {
+		const { runMigrations } = await getMigrations(mysqlOptions);
 		await runMigrations();
+		const { runMigrations: runMigrationsSqlite } =
+			await getMigrations(sqliteOptions);
+		await runMigrationsSqlite();
 	});
 
 	afterAll(async () => {
+		await mysql.query("DROP DATABASE IF EXISTS better_auth");
+		await mysql.query("CREATE DATABASE better_auth");
+		await mysql.end();
 		await fs.unlink(path.join(__dirname, "test.db"));
 	});
-	const sqlite = new Database(path.join(__dirname, "test.db"));
-	const db = new Kysely({
-		dialect: new SqliteDialect({
-			database: sqlite,
-		}),
-	});
-	const adapter = kyselyAdapter(db)(opts);
+
+	const mysqlAdapter = kyselyAdapter(mysqlKy, {
+		type: "mysql",
+	})(mysqlOptions);
 	await runAdapterTest({
-		adapter,
+		adapter: mysqlAdapter,
+	});
+
+	const sqliteAdapter = kyselyAdapter(sqliteKy, {
+		type: "sqlite",
+	})(sqliteOptions);
+	await runAdapterTest({
+		adapter: sqliteAdapter,
 	});
 });

packages/better-auth/src/oauth2/state.ts

@@ -59,7 +59,9 @@ export async function generateState(
 
 export async function parseState(c: GenericEndpointContext) {
 	const state = c.query.state || c.body.state;
+	console.log("finding verification value", state);
 	const data = await c.context.internalAdapter.findVerificationValue(state);
+	console.log("data", data);
 	if (!data) {
 		logger.error("State Mismatch. Verification not found", {
 			state,

pnpm-lock.yaml

@@ -203,6 +203,9 @@ importers:
       mini-svg-data-uri:
         specifier: ^1.4.4
         version: 1.4.4
+      mysql2:
+        specifier: ^3.11.0
+        version: 3.11.3
       next:
         specifier: 15.0.0-rc.1
         version: 15.0.0-rc.1(@babel/core@7.26.0)(react-dom@18.3.1(react@18.3.1))(react@18.3.1)