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POurl_for Builderror in flask extension with pluggable views
 

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    <p>I am building a simple extension for flask and have a problem with the url_for function not being able to build the urls within the extension.</p> <p>Can somebody help me figure out what I am missing here?</p> <p>I simplified the code to demonstrate the issue (all of the url_for calls raise a werkzeug BuildError exception):</p> <pre class="lang-py prettyprint-override"><code>import flask import flask.views import logging logging.basicConfig(level=logging.DEBUG) class MyFlaskExt(object): def __init__(self, app=None): if app is not None: self.init_app(app) def init_app(self, app): self.blueprint = flask.Blueprint('myext', __name__, static_folder='static', template_folder='templates') self.blueprint.add_url_rule('/', view_func=RootView.as_view('root'), endpoint='root') self.blueprint.add_url_rule('/var/&lt;somevar&gt;', view_func=VarView.as_view('var'), endpoint='var') self.blueprint.add_url_rule('/novar', view_func=NoVarView.as_view('novar'), endpoint='novar') app.register_blueprint(self.blueprint) class RootView(flask.views.View): def dispatch_request(self): logging.debug(flask.url_for('novar')) logging.debug(flask.url_for('novar', _external=True)) return flask.redirect(flask.url_for('var', somevar='test')) class VarView(flask.views.View): def dispatch_request(self, somevar): return "SUCCESS! ({})".format(somevar) class NoVarView(flask.views.View): def dispatch_request(self): return "SUCCESS!" if __name__ == '__main__': app = flask.Flask(__name__) app.debug = True my_ext = MyFlaskExt() my_ext.init_app(app) logging.debug(app.url_map) app.run() </code></pre>
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