flask blueprints

1. flask blueprints

Blueprint is a combination of web page templates, you can easily register to the flask.

Blueprint can be declared in the document can also be declared in the package, in general recommendation statement (case below) in the package.

1.1. Basic use

Statement after more than a blueprint directory structure:

app/

bluep # blueprint folder 1

blueo # blueprint folder 2

app.py

Case blueprint statement:

__init__.py

from flask import Blueprint

blue_t = Blueprint('blue_t', __name__)
from . import views

views.py

#coding:utf-8
__author__ = 'sss'
……

from . import blue_t

@blue_t.route('/')
@blue_t.route('/index')
def index():
    #print(blue_t.template_folder)
    #print(blue_t.root_path)
    return render_template('bluep/index.html', title='我的', user=user, posts=posts)

# 登录
@blue_t.route('/login', methods=['GET', 'POST'])
def login():
    …
@blue_t.route('/lougout')
def logout():
    logout_user()
    return redirect(url_for('blue_t.index'))

@blue_t.errorhandler(404)
def error_handle(error):
    return render_template('error/404.html')

Registration: app.py

from .bluep import blue_t as blueprint_test
app.register_blueprint(blueprint_test, url_prefix='/blue')

access:

http://127.0.0.1:9000/blue/index

url_prefix declared additional path.

1.2. Common parameters

1.2.1. Resource Path

Resources from its path blueprint __name__ parameters derived from.

By Blueprint.root_path view the properties.

1.2.2. static files

admin = Blueprint('admin', __name__, static_folder='static')

1.2.3. templates folder

There are two forms of organization blueprint

Blueprint has its own resources folder:
All share a resource blueprint folder:

The main difference is template_folder different parameter settings.

Have their own resources folder

Blueprint need to build in a directory

blue_t = Blueprint('blue_t', __name__, template_folder=r'templates\bluep')

At this blueprint will go to app \ find the template file bluep \ templates under the \ bluep.

Original shared resource folder

Blueprint not need to build in the directory

Note, however, different wording: render_template ( 'bluep / index.html')

At this blueprint will go to app \ find the template file templates \ bluep directory

Note that other template files referenced in the template file path if not specified, will look for in the app \ templates.

Resource Directory can be viewed through the property blue.root_path. template_folder will be attached to the rear.

Resource directory can be an absolute path or a relative path, but the resource directory levels below the blueprint of the application resource directory.

1.2.4. url_for

Blueprint endpoint can be understood as: the name of the function name blueprint

url_for query url address endpoint, and then find the view function

return redirect(url_for('blue_t.index'))

If at the same blueprint may also like:

url_for('.index')