I'm a beginner so I can only answer your first question. The below link has helped me with 1:M and N:M relationship experiments.
Can someone point me to where this is explained in the docs (1.6)? https://docs.djangoproject.com/en/1.6/topics/db/examples/ On Tuesday, October 22, 2013 11:59:14 PM UTC+2, Timothy W. Cook wrote: > > 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 > > > > > > -- > MLHIM VIP Signup: http://goo.gl/22B0U > ============================================ > Timothy Cook, MSc +55 21 94711995 > MLHIM http://www.mlhim.org > Like Us on FB: https://www.facebook.com/mlhim2 > Circle us on G+: http://goo.gl/44EV5 > Google Scholar: http://goo.gl/MMZ1o > LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/ff993a02-baad-4a7d-ad39-529ddafd8861%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
