1 app/models.py
from markdown import markdown
import bleach
class Post(db.Model):
tablename = 'posts'
id = db.Column(db.Integer, primary_key=True)
body = db.Column(db.Text)
timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
@staticmethod
def on_changed_body(target, value, oldvalue, initiator):
allowed_tags = ['a', 'abbr', 'acronym', 'b', 'blockquote', 'code','em', 'i', 'li', 'ol', 'pre','strong', 'ul','h1', 'h2', 'h3', 'p']
target.body_html = bleach.linkify(bleach.clean(markdown(value,output_format='html'),tags=allowed_tags, strip=True))
db.event.listen(Post.body, 'set', Post.on_changed_body)
class User(UserMixin, db.Model):
# ...
posts = db.relationship('Post', backref='author', lazy='dynamic')
@staticmethod
def generate_fake(count=100):
from sqlalchemy.exc import IntegrityError
from random import seed
import forgery_py
seed()
for i in range(count):
u = User(email=forgery_py.internet.email_address(),
username=forgery_py.internet.user_name(True),
password=forgery_py.lorem_ipsum.word(),
confirmed=True,
name=forgery_py.name.full_name(),
location=forgery_py.address.city(),
about_me=forgery_py.lorem_ipsum.sentence(),
member_since=forgery_py.date.date(True))
db.session.add(u)
try:
db.session.commit()
except IntegrityError:
db.session.rollback()
class Post(db.Model):
@staticmethod
def generate_fake(count=100):
from random import seed, randint
import forgery_py
seed()
user_count = User.query.count()
for i in range(count):
u = User.query.offset(randint(0, user_count - 1)).first()
p = Post(body=forgery_py.lorem_ipsum.sentences(randint(1, 5)),
timestamp=forgery_py.date.date(True),
author=u)
db.session.add(p)
db.session.commit()
2 app/main/forms.py
from flask.ext.pagedown.fields import PageDownField
class PostForm(Form):
body = PageDownField(("What's on your mind?", validators=[Required()])
submit = SubmitField('Submit')
3 app/main/views.py
@main.route('/', methods=['GET', 'POST'])
def index():
form = PostForm()
if current_user.can(Permission.WRITE_ARTICLES) and form.validate_on_submit():
post = Post(body=form.body.data,
author=current_user._get_current_object())
db.session.add(post)
return redirect(url_for('.index'))
# ...
page = request.args.get('page', 1, type=int)
pagination = Post.query.order_by(Post.timestamp.desc()).paginate(page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'],error_out=False)
posts = pagination.items
return render_template('index.html', form=form, posts=posts,pagination=pagination)
@main.route('/user/<username>')
def user(username):
user = User.query.filter_by(username=username).first()
if user is None:
abort(404)
posts = user.posts.order_by(Post.timestamp.desc()).all()
return render_template('user.html', user=user, posts=posts)
@main.route('/post/<int:id>')
def post(id):
post = Post.query.get_or_404(id)
return render_template('post.html', posts=[post])
@main.route('/edit/<int:id>', methods=['GET', 'POST'])
@login_required
def edit(id):
post = Post.query.get_or_404(id)
if current_user != post.author and
not current_user.can(Permission.ADMINISTER):
abort(403)
form = PostForm()
if form.validate_on_submit():
post.body = form.body.data
db.session.add(post)
flash('The post has been updated.')
return redirect(url_for('.post', id=post.id))
form.body.data = post.body
return render_template('edit_post.html', form=form)
4 app/templates/index.html
{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}
{% import "_macros.html" as macros %}
...
<div>
{% if current_user.can(Permission.WRITE_ARTICLES) %}
{{ wtf.quick_form(form) }}
{% endif %}
</div>
<ul class="posts">
{% for post in posts %}
<li class="post">
<div class="profile-thumbnail">
<a href="{{ url_for('.user', username=post.author.username) }}">
<img class="img-rounded profile-thumbnail"
src="{{ post.author.gravatar(size=40) }}">
</a>
</div>
<div class="post-date">{{ moment(post.timestamp).fromNow() }}</div>
<div class="post-author">
<a href="{{ url_for('.user', username=post.author.username) }}">
{{ post.author.username }}
</a>
</div>
<div class="post-body">{{ post.body }}</div>
</li>
{% endfor %}
</ul>
{% include '_posts.html' %}
<div class="pagination">
{{ macros.pagination_widget(pagination, '.index') }}
</div>
{% endif %}
5 app/templates/user.html
<h3>Posts by {{ user.username }}</h3>
{% include '_posts.html' %}
6 生成虚拟数据：pip install forgerypy
$ python manage.py shell
User.generate_fake(100)
Post.generate_fake(100)
7 app/templates/_macros.html
{% macro pagination_widget(pagination, endpoint, fragment='') %}
<ul class="pagination">
<li{% if not pagination.has_prev %} class="disabled"{% endif %}>
<a href="{% if pagination.has_prev %}{{ url_for(endpoint, page=pagination.prev_num, **kwargs) }}{{ fragment }}{% else %}#{% endif %}">
«
</a>
</li>
{% for p in pagination.iter_pages() %}
{% if p %}
{% if p == pagination.page %}
<li class="active">
<a href="{{ url_for(endpoint, page = p, **kwargs) }}{{ fragment }}">{{ p }}</a>
</li>
{% else %}
<li>
<a href="{{ url_for(endpoint, page = p, **kwargs) }}{{ fragment }}">{{ p }}</a>
</li>
{% endif %}
{% else %}
<li class="disabled"><a href="#">…</a></li>
{% endif %}
{% endfor %}
<li{% if not pagination.has_next %} class="disabled"{% endif %}>
<a href="{% if pagination.has_next %}{{ url_for(endpoint, page=pagination.next_num, **kwargs) }}{{ fragment }}{% else %}#{% endif %}">
»
</a>
</li>
</ul>
{% endmacro %}
8 pip install flask-pagedown markdown bleach #添加富文本编辑器
9 app/init.py
from flask.ext.pagedown import PageDown
...
pagedown = PageDown()
...
def create_app(config_name):
# ...
pagedown.init_app(app)
# ...
10 app/index.html
{% block scripts %}
{{ super() }}
{{ pagedown.include_pagedown() }}
{% endblock %}
paginate对象方法
11 app/templates/_posts.html
<ul class="posts">
{% for post in posts %}
<li class="post">
<div class="post-thumbnail">
<a href="{{ url_for('.user', username=post.author.username) }}">
<img class="img-rounded profile-thumbnail" src="{{ post.author.gravatar(size=40) }}">
</a>
</div>
<div class="post-content">
<div class="post-date">{{ moment(post.timestamp).fromNow() }}</div>
<div class="post-author"><a href="{{ url_for('.user', username=post.author.username) }}">{{ post.author.username }}</a></div>
<div class="post-body">
{% if post.body_html %}
{{ post.body_html | safe }}
{% else %}
{{ post.body }}
{% endif %}
</div>
<div class="post-footer">
{% if current_user == post.author %}
<a href="{{ url_for('.edit', id=post.id) }}">
<span class="label label-primary">Edit</span>
</a>
{% elif current_user.is_administrator() %}
<a href="{{ url_for('.edit', id=post.id) }}">
<span class="label label-danger">Edit [Admin]</span>
</a>
{% endif %}
<a href="{{ url_for('.post', id=post.id) }}">
<span class="label label-default">Permalink</span>
</a>
<a href="{{ url_for('.post', id=post.id) }}#comments">
<span class="label label-primary">{{ post.comments.count() }} Comments</span>
</a>
</div>
</div>
</li>
{% endfor %}
</ul>
12 app/templates/post.html
{% extends "base.html" %}
{% block title %}Flasky - Post{% endblock %}
{% block page_content %}
{% include '_posts.html' %}
{% endblock %}
13 app/templates/edit_post.html
{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}
{% block title %}Flasky - Edit Post{% endblock %}
{% block page_content %}
<div class="page-header">
<h1>Edit Post</h1>
</div>
<div>
{{ wtf.quick_form(form) }}
</div>
{% endblock %}
{% block scripts %}
{{ super() }}
{{ pagedown.include_pagedown() }}
{% endblock %}
db.event.listen(Post.body, 'set', Post.on_changed_body) 的作用
