我有一个 Django 模型(db 是 PostgreSQL),其中包含发布日期的 datetime 字段:
class Story(models.Model):
...
pub_date = models.DateTimeField(default=datetime.datetime.now)
...
还有一个模板标签来获取给定月份和年份的这些对象:
from django import template
from news.models import Story
class StoryYearListNode(template.Node):
def __init__(self, varname):
self.varname = varname
def render(self, context):
context[self.varname] = Story.live.dates("pub_date", "year").reverse()
return ''
def do_get_story_year_list(parser, token):
"""
Gets a list of years in which stories are published.
Syntax::
{% get_story_year_list as [varname] %}
Example::
{% get_story_year_list as year_list %}
"""
bits = token.contents.split()
if len(bits) != 3:
raise template.TemplateSyntaxError, "'%s' tag takes two arguements" % bits[0]
if bits[1] != "as":
raise template.TemplateSyntaxError, "First arguement to '%s' tag must be 'as'" % bits[0]
return StoryYearListNode(bits[2])
class StoryMonthListNode(template.Node):
def __init__(self, varname):
self.varname = varname
def render(self, context):
context[self.varname] = Story.live.dates("pub_date", "month").reverse()
return ''
def do_get_story_month_list(parser, token):
"""
Gets a list of months in which stories are published.
Syntax::
{% get_story_month_list as [varname] %}
Example::
{% get_story_month_list as month_list %}
"""
bits = token.contents.split()
if len(bits) != 3:
raise template.TemplateSyntaxError, "'%s' tag takes two arguements" % bits[0]
if bits[1] != "as":
raise template.TemplateSyntaxError, "First arguement to '%s' tag must be 'as'" % bits[0]
return StoryMonthListNode(bits[2])
register = template.Library()
register.tag('get_story_month_list', do_get_story_month_list)
register.tag('get_story_year_list', do_get_story_year_list)
但是当我在模板上使用标签时,日期(以 get_story_month_list 为例)是从发布日期开始的一个月或一年:
{% load date%}
{% get_story_month_list as month_list %}
<ul class="list-unstyled">
{% for month in month_list %}
<li><a href="{{ month|date:"Y/M"|lower }}/">{{ month|date:"F Y" }}</a></li>
{% endfor %}
</ul>
任何线索我做错了什么?