I'm building an app to serve the main pages for each category of a
news site. For this, I need to have several different ways to display
article teasers. For example, in one part of a page I might want to
display the teasers for five specific articles; in another part of the
page, I'd want to show the teasers for the last X-number of stories in
a specific category. Ideally, the user would be able to select the
display option as a drop down list in the model that describes that
part of the page:
class PageBlock(models.Model):
name = models.PositiveSmallIntegerField()
cont = SeparatedValuesField(max_length=300)
page = models.ForeignKey(Page)
#disp = models.CharField(choices=DISPLAY_CHOICES)
At the moment, I have a custom field (SeparatedValuesField) that takes
in a list of stories, finds their IDs, and saves them in an array.
This works perfectly as a way to display the teasers for any number of
specific articles.
def get_db_prep_value(self,value):
from news.models import Content
from datetime import datetime
if not value: return
ids = unicode('')
styles = unicode('')
for s in value:
line_list = s.split(' ')
if len(line_list) == 1:
line_list.append(0) #
#unpack date and slug
dateslug = line_list.pop(0)
year = int(dateslug[:4])
month = int(dateslug[4:6])
day = int(dateslug[6:8])
slug = dateslug[8:]
#GET content, save the ID
obj = Content.objects.get(slug__exact=slug,
date__gte=datetime(year,month,day))
ids += unicode(',') + unicode(obj.id) #commas applied at
head, then we chop of first char in the end to normalize commas
styles += unicode(',') + unicode(line_list.pop(0))
cont = [ids[1:], styles[1:]]
return self.token.join(cont)
However, this way of parsing the input will only work for one of the
display methods. What (I think) I need is multiple ways of saving the
input to the database, so that different parsing code would be run if
display choice A were selected over display choice B. But I haven't
found a way for my custom field to know which choice was selected in
the model's "disp" field.
Is there a way for fields to share their data with each other before
they are saved to the database? Or am I going about this a terrible
way?
Thanks!
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