class PostForm(Form):
  post = TextField('post', validators = [Required()])

<!-- extend base layout -->
{% extends "base.html" %}
 
{% block content %}
<h1>Hi, {{g.user.nickname}}!</h1>
<form action="" method="post" name="post">
  {{form.hidden_tag()}}
  <table>
    <tr>
      <td>Say something:</td>
      <td>{{ form.post(size = 30, maxlength = 140) }}</td>
      <td>
      {% for error in form.errors.post %}
      <span style="color: red;">[{{error}}]</span><br>
      {% endfor %}
      </td>
    </tr>
    <tr>
      <td></td>
      <td><input type="submit" value="Post!"></td>
      <td></td>
    </tr>
  </table>
</form>
{% for post in posts %}
<p>
 {{post.author.nickname}} says: <b>{{post.body}}</b>
</p>
{% endfor %}
{% endblock %}

from forms import LoginForm, EditForm, PostForm
from models import User, ROLE_USER, ROLE_ADMIN, Post
 
@app.route('/', methods = ['GET', 'POST'])
@app.route('/index', methods = ['GET', 'POST'])
@login_required
def index():
  form = PostForm()
  if form.validate_on_submit():
    post = Post(body = form.post.data, timestamp = datetime.utcnow(), author = g.user)
    db.session.add(post)
    db.session.commit()
    flash('Your post is now live!')
    return redirect(url_for('index'))
  posts = [
    {
      'author': { 'nickname': 'John' },
      'body': 'Beautiful day in Portland!'
    },
    {
      'author': { 'nickname': 'Susan' },
      'body': 'The Avengers movie was so cool!'
    }
  ]
  return render_template('index.html',
    title = 'Home',
    form = form,
    posts = posts)

return redirect(url_for('index'))

posts = [
    {
      'author': { 'nickname': 'John' },
      'body': 'Beautiful day in Portland!'
    },
    {
      'author': { 'nickname': 'Susan' },
      'body': 'The Avengers movie was so cool!'
    }
  ]

posts = g.user.followed_posts().all()

posts = g.user.followed_posts().paginate(1, 3, False).items

# pagination
POSTS_PER_PAGE = 3

http://localhost:5000/     <-- page #1 (default)
http://localhost:5000/index  <-- page #1 (default)
http://localhost:5000/index/1 <-- page #1
http://localhost:5000/index/2 <-- page #2

from config import POSTS_PER_PAGE
 
@app.route('/', methods = ['GET', 'POST'])
@app.route('/index', methods = ['GET', 'POST'])
@app.route('/index/<int:page>', methods = ['GET', 'POST'])
@login_required
def index(page = 1):
  form = PostForm()
  if form.validate_on_submit():
    post = Post(body = form.post.data, timestamp = datetime.utcnow(), author = g.user)
    db.session.add(post)
    db.session.commit()
    flash('Your post is now live!')
    return redirect(url_for('index'))
  posts = g.user.followed_posts().paginate(page, POSTS_PER_PAGE, False).items
  return render_template('index.html',
    title = 'Home',
    form = form,
    posts = posts)

posts = g.user.followed_posts().paginate(page, POSTS_PER_PAGE, False).items

posts = g.user.followed_posts().paginate(page, POSTS_PER_PAGE, False)

<!-- posts is a Paginate object -->
{% for post in posts.items %}
<p>
 {{post.author.nickname}} says: <b>{{post.body}}</b>
</p>
{% endfor %}

<!-- posts is a Paginate object -->
{% for post in posts.items %}
<p>
 {{post.author.nickname}} says: <b>{{post.body}}</b>
</p>
{% endfor %}
{% if posts.has_prev %}<a href="{{ url_for('index', page = posts.prev_num) }}"><< Newer posts</a>{% else %}<< Newer posts{% endif %} |
{% if posts.has_next %}<a href="{{ url_for('index', page = posts.next_num) }}">Older posts >></a>{% else %}Older posts >>{% endif %}

<!-- posts is a Paginate object -->
{% for post in posts.items %}
  {% include 'post.html' %}
{% endfor %}

@app.route('/user/<nickname>')
@app.route('/user/<nickname>/<int:page>')
@login_required
def user(nickname, page = 1):
  user = User.query.filter_by(nickname = nickname).first()
  if user == None:
    flash('User ' + nickname + ' not found.')
    return redirect(url_for('index'))
  posts = user.posts.paginate(page, POSTS_PER_PAGE, False)
  return render_template('user.html',
    user = user,
    posts = posts)

<!-- posts is a Paginate object -->
{% for post in posts.items %}
  {% include 'post.html' %}
{% endfor %}
{% if posts.has_prev %}<a href="{{ url_for('user', nickname = user.nickname, page = posts.prev_num) }}"><< Newer posts</a>{% else %}<< Newer posts{% endif %} |
{% if posts.has_next %}<a href="{{ url_for('user', nickname = user.nickname, page = posts.next_num) }}">Older posts >></a>{% else %}Older posts >>{% endif %}