Geek asks and answers

Adding a custom Jinja2 filter in GAE 1.6.0

I would like to add a filter to format my time, and best of all are filters like django timesince, which automatically displays the language of the selected i18n language, but first make a quick decision that I would like to format the Date. Proposed solution from the manual :

def datetimeformat(value, format='%H:%M / %d-%m-%Y'):
    return value.strftime(format)

jinja_environment.filters['datetimeformat'] = datetimeformat

But adding this code to my file does not make the filter available in the template:

{{ ad.modified|datetimeformat }}
TemplateAssertionError: no filter named 'datetimeformat'

If I add the code to the Jinja2 library filters.py, then it will work. But I don’t need to add Jinja2 files manually, it should just add Jinja2 to mine app.yamland put my filter in my code, not in Jinja2 code. Where should I put the filter code?

thank

Update

My code looks like this and it seems the filter is not raised:

from django.utils import translation
from django.utils.translation import gettext, ngettext, ugettext, ungettext, get_language, activate
from jinja2 import Environment, FileSystemLoader

class DjangoTranslator(object):
    def __init__(self):
        self.gettext = gettext
        self.ngettext = ngettext
        self.ugettext = ugettext
        self.ungettext = ungettext

class DjangoEnvironment(jinja2.Environment):
    def get_translator(self, context):
        return DjangoTranslator()

jinja_environment = DjangoEnvironment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), extensions=['jinja2.ext.i18n'])
jinja_environment.install_gettext_translations(translation)

def datetimeformat(value, format='%H:%M / %d-%m-%Y'):
    return value.strftime(format)

jinja_environment.filters['datetimeformat'] = datetimeformat
+1
2

Jinja2 docs , . , jinja2.Environment :

env = jinja2.Environment(
    loader=jinja2.FileSystemLoader(template_path))
env.filters['default_if_none'] = default_if_none  # a function
tmpl = env.get_template(filename)
tmpl.render(**context)
+3

jinja2, ,

Kee , .

, webapp2.WSGIApplication

myconfig = {}
myconfig['webapp2_extras.jinja2'] =  {'template_path': ['templates','blog_posts'],
                                      'filters': {'blog_filter': blog_filter}}

app = webapp2.WSGIApplication(_routes,
    debug=True,
    config = myconfig)
+2

More articles:


All Articles