Pagination issue while using Flask-WTF in Flask with Flask-Bootstrap and Flask-SQLAlchemy

form_test.py

from flask import Flask, render_template_string, request
from flask_bootstrap import Bootstrap
from jinja2 import Template
from flask_wtf import Form
from wtforms import StringField
from wtforms.validators import DataRequired
from flask_sqlalchemy import SQLAlchemy


# Build the app along with its extensions and the route
app = Flask(__name__)
app.config['SECRET_KEY'] = 'foobarbaz'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://'

bs = Bootstrap(app)
db = SQLAlchemy(app)

# Define some module constants and the search form
search_template = """
{% extends 'bootstrap/base.html' %}
{% from 'bootstrap/wtf.html' import form_errors, form_field %}
{% from "bootstrap/pagination.html" import render_pagination %}

{% block content %}
    <div style="padding:2em">
    <p>Form:</p>

    {% if form %}
        <form class="form form-horizontal" method="get" role="form">
          {{ form_errors(form, hiddens="only") }}
          {{ form_field(form.search) }}
        </form>
    {% endif %}

    <p>Data:</p>

    {% if query_results %}
    {{ render_pagination(query_results) }}
    <ul>
        {% for item in query_results.items %}
        <li>{{ item }}</li>
        {% endfor %}
    </ul>
    {% endif %}
    </div>
{% endblock %}
"""

class SearchForm(Form):
        search = StringField('search', validators=[DataRequired()])

class Example(db.Model):
    __tablename__ = 'examples'

    id = db.Column(db.Integer, primary_key=True)

    def __repr__(self):
        return "%03d" % self.id

db.create_all()
for i in range(50):
    db.session.add(Example())
db.session.commit()


@app.route('/')
def index():
    form = SearchForm()

    search = request.args.get('search')
    if search:
        match = '%' + str(search) + '%'
        query_results = Example.query.filter(Example.id.like(match))

    else:
        query_results = Example.query

    query_results = query_results.paginate(per_page=10)
    return render_template_string(search_template, form=form, query_results=query_results)

get form example with wtforms