python 2.7 - Unusual behavior of jinja2 template_filter decorator in flask application -


i have filters.py file in flask application , content is:

# -*- coding: utf-8 -*- __future__ import absolute_import, unicode_literals, print_function import arrow fresque import app   @app.template_filter('short') def shorted_commit(cid):     """gets short version of commit id"""     return cid[:6]   @app.template_filter('humanize') def humanize_date(date):     """ template filter returning last commit date of provided repo.     """     return arrow.get(date).humanize()

now trying use template filter in html file content follows:

{% extends 'layout.html' %} {% import 'macros.html' macros %} {% block content %} {% if tree %}         {% entry in tree %}                 <span> {{ entry.name }} </span>                 <span> {{ entry.hex|short}} </span>         {% endfor %}   {% endif %} {% endblock %}

also controller function renders pages written , saved in file named gitview.py. file resides in same folder of filters.py

# -*- coding: utf-8 -*- __future__ import absolute_import, unicode_literals, print_function  import os import flask import pygit2  fresque import app fresque.lib.git import repository   @app.route("/repo/<name>") def repo_base_view(name):     path = os.path.join(         app.config['git_directory_path'], flask.g.fas_user.username)      try:         repo_obj = repository(os.path.join(path, name))     except ioerror:         return "no such repo", 404      cnt = 0     last_commits = []     tree = []     if not repo_obj.is_empty:         try:             commit in repo_obj.walk(                     repo_obj.head.target, pygit2.git_sort_time):                 last_commits.append(commit)                 cnt += 1                 if cnt == 3:                     break             tree = sorted(last_commits[0].tree, key=lambda x: x.filemode)         except pygit2.giterror:             pass     return flask.render_template('/git/repo.html', tree=tree)

but when trying make request endpoint /repo/, getting error.

templateassertionerror: no filter named 'short'

here full traceback of error

127.0.0.1 - - [01/jun/2015 02:37:28] "get /repo/spiderman http/1.1" 500 - traceback (most recent call last):   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__     return self.wsgi_app(environ, start_response)   file "/users/rranjan/python/fresque/fresque/proxy.py", line 50, in __call__     return self.app(environ, start_response)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app     response = self.make_response(self.handle_exception(e))   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception     reraise(exc_type, exc_value, tb)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app     response = self.full_dispatch_request()   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request     rv = self.handle_user_exception(e)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception     reraise(exc_type, exc_value, tb)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request     rv = self.dispatch_request()   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request     return self.view_functions[rule.endpoint](**req.view_args)   file "/users/rranjan/python/fresque/fresque/gitview.py", line 41, in repo_base_view     return flask.render_template('/git/repo.html', tree=tree)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/flask/templating.py", line 127, in render_template     return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/environment.py", line 830, in get_or_select_template     return self.get_template(template_name_or_list, parent, globals)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/environment.py", line 791, in get_template     return self._load_template(name, self.make_globals(globals))   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/environment.py", line 765, in _load_template     template = self.loader.load(self, name, globals)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/loaders.py", line 125, in load     code = environment.compile(source, name, filename)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/environment.py", line 554, in compile     self.handle_exception(exc_info, source_hint=source)   file "/users/rranjan/.virtualenvs/fresque/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception     reraise(exc_type, exc_value, tb)   file "/users/rranjan/python/fresque/fresque/templates/git/repo.html", line 15, in <module>     <span class="filehex" >{{ entry.hex|short }}</span> templateassertionerror: no filter named 'short'

just putting filter definitions in module doesn't run them, need import module after creating app. run code , register filters.

# ... app = flask(__name__) # ... fresque import filters

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