HsOjo's Blog

前言

Flask是一个轻量级的python web框架，与django相比，flask抛开了繁琐的配置项等等。

Flask与Django一样，支持模块化开发，使用BluePrint（蓝图）实现。

但是，这个蓝图并不支持嵌套。。

正文

当然，我能想到的问题早就有人想到，并解决了。

详情见issue.

解决方案

class NestableBlueprint(Blueprint):
    """
    Hacking in support for nesting blueprints, until hopefully https://github.com/mitsuhiko/flask/issues/593 will be resolved
    """

    def register_blueprint(self, blueprint, **options):
        def deferred(state):
            url_prefix = (state.url_prefix or u"") + (options.get('url_prefix', blueprint.url_prefix) or u"")
            if 'url_prefix' in options:
                del options['url_prefix']

            state.app.register_blueprint(blueprint, url_prefix=url_prefix, **options)

        self.record(deferred)

使用方法

以下为从我的flask demo里复制出来的代码。

from flask import Blueprint

from ..libs.nestable_blueprint import NestableBlueprint

exam = NestableBlueprint('exam', __name__, template_folder='templates', static_folder='static')
exam_admin = NestableBlueprint('exam.admin', __name__, template_folder='templates', static_folder='static')
exam_admin_category = Blueprint('exam.admin.category', __name__, template_folder='templates', static_folder='static')
exam_admin_question = Blueprint('exam.admin.question', __name__, template_folder='templates', static_folder='static')

exam_admin.register_blueprint(exam_admin_category, url_prefix='/category')
exam_admin.register_blueprint(exam_admin_question, url_prefix='/question')
exam.register_blueprint(exam_admin, url_prefix='/admin')

exam_category = Blueprint('exam.category', __name__, template_folder='templates', static_folder='static')
exam_question = Blueprint('exam.question', __name__, template_folder='templates', static_folder='static')

exam.register_blueprint(exam_category, url_prefix='/category')
exam.register_blueprint(exam_question, url_prefix='/question')

from . import views, models
from .admin.category import views
from .admin.question import views

from .category import views