带你认识 flask 个人主页和头像

@app.route('/user/<username>')
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    posts = [
        {'author': user, 'body': 'Test post #1'},
        {'author': user, 'body': 'Test post #2'}
    ]
    return render_template('user.html', user=user, posts=posts)

{% extends "base.html" %}
{% block content %}

<h1>User: {{ user.username }}</h1>

<hr>

{% for post in posts %}

<p>

{{ post.author.username }} says: <b>{{ post.body }}</b>

</p>

{% endfor %}

{% endblock %}

    <div>

Microblog:

<a href="{{ url_for('index') }}">Home</a>

{% if current_user.is_anonymous %}

<a href="{{ url_for('login') }}">Login</a>

{% else %}

<a href="{{ url_for('user', username=current_user.username) }}">Profile</a>

<a href="{{ url_for('logout') }}">Logout</a>

{% endif %}

</div>

>>> from hashlib import md5
>>> 'https://www.gravatar.com/avatar/' + md5(b'john@example.com').hexdigest()
'https://www.gravatar.com/avatar/d4c74594d841139328695756648b6bd6'

from hashlib import md5
# ...
class User(UserMixin, db.Model):
    # ...
    def avatar(self, size):
        digest = md5(self.email.lower().encode('utf-8')).hexdigest()
        return 'https://www.gravatar.com/avatar/{}?d=identicon&s={}'.format(
            digest, size)

{% extends "base.html" %}
{% block content %}
    <table>
        <tr valign="top">
            <td><img src="{{ user.avatar(128) }}"></td>
            <td><h1>User: {{ user.username }}</h1></td>
        </tr>
    </table>
    <hr>
    {% for post in posts %}
    <p>
    {{ post.author.username }} says: <b>{{ post.body }}</b>
    </p>
    {% endfor %}
{% endblock %}

{% extends "base.html" %}
{% block content %}
    <table>
        <tr valign="top">
            <td><img src="{{ user.avatar(128) }}"></td>
            <td><h1>User: {{ user.username }}</h1></td>
        </tr>
    </table>
    <hr>
    {% for post in posts %}
    <table>
        <tr valign="top">
            <td><img src="{{ post.author.avatar(36) }}"></td>
            <td>{{ post.author.username }} says:<br>{{ post.body }}</td>
        </tr>
    </table>
    {% endfor %}
{% endblock %}

  <table>
        <tr valign="top">
            <td><img src="{{ post.author.avatar(36) }}"></td>
            <td>{{ post.author.username }} says:<br>{{ post.body }}</td>
        </tr>
    </table>

{% extends "base.html" %}
{% block content %}
    <table>
        <tr valign="top">
            <td><img src="{{ user.avatar(128) }}"></td>
            <td><h1>User: {{ user.username }}</h1></td>
        </tr>
    </table>
    <hr>
    {% for post in posts %}
        {% include '_post.html' %}
    {% endfor %}
{% endblock %}

class User(UserMixin, db.Model):
    # ...
    about_me = db.Column(db.String(140))
    last_seen = db.Column(db.DateTime, default=datetime.utcnow)

(venv) $ flask db migrate -m "new fields in user model"
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
INFO  [alembic.autogenerate.compare] Detected added column 'user.about_me'
INFO  [alembic.autogenerate.compare] Detected added column 'user.last_seen'
  Generating /home/miguel/microblog/migrations/versions/37f06a334dbf_new_fields_in_user_model.py ... done

(venv) $ flask db upgrade
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade 780739b227a7 -> 37f06a334dbf, new fields in user model

{% extends "base.html" %}
{% block content %}

<table>

<tr valign="top">

<td><img src="{{ user.avatar(128) }}"></td>

<td>

<h1>User: {{ user.username }}</h1>

{% if user.about_me %}<p>{{ user.about_me }}</p>{% endif %}

{% if user.last_seen %}<p>Last seen on: {{ user.last_seen }}</p>{% endif %}

</td>

</tr>

</table>

...

{% endblock %}

from datetime import datetime
@app.before_request

def before_request():

if current_user.is_authenticated:

current_user.last_seen = datetime.utcnow()

db.session.commit()

from wtforms import StringField, TextAreaField, SubmitField
from wtforms.validators import DataRequired, Length
# ...
class EditProfileForm(FlaskForm):

username = StringField('Username', validators=[DataRequired()])

about_me = TextAreaField('About me', validators=[Length(min=0, max=140)])

submit = SubmitField('Submit')

{% extends "base.html" %}

{% block content %}

<h1>Edit Profile</h1>

<form action="" method="post">

{{ form.hidden_tag() }}

<p>

{{ form.username.label }}<br>

{{ form.username(size=32) }}<br>

{% for error in form.username.errors %}

<span style="color: red;">[{{ error }}]</span>

{% endfor %}

</p>

<p>

{{ form.about_me.label }}<br>

{{ form.about_me(cols=50, rows=4) }}<br>

{% for error in form.about_me.errors %}

<span style="color: red;">[{{ error }}]</span>

{% endfor %}

</p>

<p>{{ form.submit() }}</p>

</form>

{% endblock %}

from app.forms import EditProfileForm
@app.route('/edit_profile', methods=['GET', 'POST'])

@login_required

def edit_profile():

form = EditProfileForm()

if form.validate_on_submit():

current_user.username = form.username.data

current_user.about_me = form.about_me.data

db.session.commit()

flash('Your changes have been saved.')

return redirect(url_for('edit_profile'))

elif request.method == 'GET':

form.username.data = current_user.username

form.about_me.data = current_user.about_me

return render_template('edit_profile.html', title='Edit Profile',

form=form)

{% if user == current_user %}
   <p><a href="{{ url_for('edit_profile') }}">Edit your profile</a></p>
{% endif %}