python flask web 博客实例 博客模块 2

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

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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

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