Can someone point me to where this is explained in the docs (1.6)?
I have a ManyToMany relationship in my models between Author and Paper.
I am processing an XML file to create records for Papers.
I want to check if an Author exists and if not create the record.
This was quite easy for Foreign Key relationships. But I can't get my head
around how to do this for ManyToMany. All of my Authors are created
correctly. But none are automatically selected for the Papers.
Some code:
class AuthorManager(models.Manager):
def create_author(self, name, email, affl):
a = self.create(name=name, email=email, affiliation=affl)
a.save()
return a
class Author(models.Model):
name = models.CharField("Name", max_length=255, db_index=True,
null=True, blank=True, help_text="")
email = models.EmailField("Email", max_length=255, null=True,
blank=True, help_text="")
affiliation = models.CharField("Affiliation", max_length=255,
null=True, blank=True, help_text="")
objects = AuthorManager()
def __str__(self):
return self.name
def import_pubmed_xml(obj, f):
...
p =
Paper.objects.create_paper(ptitle,rid,jid,jyear,jvol,jissue,lang)
#authors
affl = article.xpath("./Affiliation/text()")
if affl: affl = affl[0]
else: affl = 'unknown'
affl = affl.strip()
authorlist = article.xpath("./AuthorList")
for authorentry in authorlist:
for author in authorentry:
lname = author.xpath("./LastName/text()")
if lname:
lname = lname[0]
else:
lname = 'unknown'
fname = author.xpath("./ForeName/text()")
if fname:
fname = fname[0]
else:
fname = 'unknown'
initials = author.xpath("./Initials/text()")
if initials:
initials = initials[0]
else:
initials = ''
a_name = (lname +', '+fname + ' ' +initials).strip()
print(a_name)
email = ''
#need to lookup Author by name then check affiliation. If
not found then create it.
try:
a = Author.objects.get(name=a_name)
p.authors.id = a.id
p.save()
except ObjectDoesNotExist:
a = Author.objects.create_author(a_name, email, affl)
p.authors.id = a.id
p.save()
===================================================
Thanks in Advance,
Tim
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