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Prevent DB lookups with local cache of filters

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benemery 2014-04-13 00:49:22 +01:00 committed by Matt Westcott
parent 2939a5015d
commit e82eb54101
1 changed files with 6 additions and 1 deletions
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7
wagtail/wagtailimages/templatetags/image_tags.py
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@ -4,6 +4,8 @@ from wagtail.wagtailimages.models import Filter
register = template.Library()
# Local cache of filters, avoid hitting the DB
filters = {}
@register.tag(name="image")
def image(parser, token):
@ -30,9 +32,12 @@ def image(parser, token):
class ImageNode(template.Node):
def __init__(self, image_var_name, filter_spec, output_var_name=None):
self.image_var = template.Variable(image_var_name)
self.filter, created = Filter.objects.get_or_create(spec=filter_spec)
self.output_var_name = output_var_name
if filter_spec not in filters:
filters[filter_spec], _ = Filter.objects.get_or_create(spec=filter_spec)
self.filter = filters[filter_spec]
def render(self, context):
try:
image = self.image_var.resolve(context)