烧瓶分页的问题

from flask import Flask, request, url_for, render_template
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
db = SQLAlchemy(app)

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(100), nullable=False)

@app.route('/')
def index():
    page = request.args.get('page', 1, type=int)
    posts = Post.query.paginate(page=page, per_page=10)
    return render_template('index.html', posts=posts)

if __name__ == '__main__':
    app.run(debug=True)

posts = Post.query.order_by(Post.id).paginate(page=page, per_page=10)

<!-- index.html -->
<ul class="pagination">
    {% for page_num in posts.iter_pages(left_edge=1, right_edge=1, left_current=1, right_current=2) %}
        {% if page_num %}
            {% if posts.page == page_num %}
                <li class="page-item active"><a class="page-link" href="{{ url_for('index', page=page_num) }}">{{ page_num }}</a></li>
            {% else %}
                <li class="page-item"><a class="page-link" href="{{ url_for('index', page=page_num) }}">{{ page_num }}</a></li>
            {% endif %}
        {% else %}
            <li class="page-item disabled"><span class="page-link">...</span></li>
        {% endif %}
    {% endfor %}
</ul>