在KeystoneJS中验证失败时创建flash消息

const keystone = require('keystone');
const session = require('express-session');

keystone.set('session', session({
    secret: 'your-secret-key',
    resave: false,
    saveUninitialized: true,
}));

if (!valid) {
    req.flash('error', 'Validation failed. Please try again.');
}

exports.renderView = (req, res) => {
    const locals = res.locals;
    locals.flashMessages = {
        error: req.flash('error'),
    };
    // 其他处理逻辑
    res.render('view', locals);
};

<% if (flashMessages.error && flashMessages.error.length) { %>
    <div class="alert alert-danger">
        <% flashMessages.error.forEach(function(message) { %>
            <p><%= message %></p>
        <% }); %>
    </div>
<% } %>