Hi All,
RajeshD gave me a great pointer to the unique_together directive. So
I tried it in my model:
class Scripture( models.Model ):
book = models.CharField (maxlength = 2, choices = constants.BIBLE_BOOKS)
chapter = models.IntegerField ()
from_verse = models.IntegerField ()
to_verse = models.IntegerField (blank = True, null = True)
passage = models.SlugField (prepopulate_from = ('chapter',
'from_verse', 'to_verse'), blank = True)
def __str__( self ):
if self.to_verse == None:
return "%s %s:%s" % (self.get_book_display(),
self.chapter, self.from_verse)
else:
return "%s %s:%s-%s" % (self.get_book_display(),
self.chapter, self.from_verse, self.to_verse)
def save( self ):
if self.to_verse <= self.from_verse:
self.to_verse = None
super (Scripture, self).save()
class Meta:
unique_together = (('book', 'chapter', 'from_verse', 'to_verse',),)
So, ideally, something like "Genesis 1:1-2" should be allowed exactly
once in the table. However, that doesn't seem to be the case. The
directive works with two (like book and chapter or from and to), but
not with more. Am I using it in a wrong way?
PS I tried with both sqlite and postgresql
Thanks!
Seemant
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