bgneal@294: """
bgneal@294: import_old_links.py - For importing links from SG101 1.0 as csv files.
bgneal@294: """
bgneal@333: from __future__ import with_statement
bgneal@294: import csv
bgneal@294: import datetime
bgneal@294: 
bgneal@294: from django.core.management.base import LabelCommand, CommandError
bgneal@294: from django.contrib.auth.models import User
bgneal@294: 
bgneal@294: from weblinks.models import Link, Category
bgneal@294: 
bgneal@294: 
bgneal@294: class Command(LabelCommand):
bgneal@294:     args = '<filename filename ...>'
bgneal@294:     help = 'Imports weblinks from the old database in CSV format'
bgneal@294: 
bgneal@294:     def handle_label(self, filename, **options):
bgneal@294:         """
bgneal@294:         Process each line in the CSV file given by filename by
bgneal@294:         creating a new weblink object and saving it to the database.
bgneal@294: 
bgneal@294:         """
bgneal@294:         self.cats = {}
bgneal@294:         try:
bgneal@294:             self.default_user = User.objects.get(pk=2)
bgneal@294:         except User.DoesNotExist:
bgneal@294:             raise CommandError("Need a default user with pk=1")
bgneal@294: 
bgneal@294:         try:
bgneal@294:             with open(filename, "rb") as f:
bgneal@294:                 self.reader = csv.DictReader(f)
bgneal@294:                 try:
bgneal@294:                     for row in self.reader:
bgneal@294:                         self.process_row(row)
bgneal@294:                 except csv.Error, e:
bgneal@294:                     raise CommandError("CSV error: %s %s %s" % (
bgneal@294:                         filename, self.reader.line_num, e))
bgneal@294: 
bgneal@294:         except IOError:
bgneal@294:             raise CommandError("Could not open file: %s" % filename)
bgneal@294: 
bgneal@294:     def get_category(self, row):
bgneal@294:         """
bgneal@294:         Return the Category object for the row.
bgneal@294: 
bgneal@294:         """
bgneal@294:         cat_id = row['cid']
bgneal@294:         if cat_id not in self.cats:
bgneal@294:             try:
bgneal@294:                 cat = Category.objects.get(pk=cat_id)
bgneal@294:             except Category.DoesNotExist:
bgneal@294:                 raise CommandError("Category does not exist: %s on line %s" % (
bgneal@294:                     cat_id, self.reader.line_num))
bgneal@294:             else:
bgneal@294:                 self.cats[cat_id] = cat
bgneal@294:         return self.cats[cat_id]
bgneal@294: 
bgneal@294:     def get_user(self, username):
bgneal@294:         """
bgneal@294:         Return the user object for the given username.
bgneal@294:         If the user cannot be found, self.default_user is returned.
bgneal@294: 
bgneal@294:         """
bgneal@294:         try:
bgneal@294:             return User.objects.get(username=username)
bgneal@294:         except User.DoesNotExist:
bgneal@294:             return self.default_user
bgneal@294: 
bgneal@294:     def process_row(self, row):
bgneal@294:         """
bgneal@294:         Process one row from the CSV file: create an object for the row
bgneal@294:         and save it in the database.
bgneal@294: 
bgneal@294:         """
bgneal@294:         link = Link(category=self.get_category(row),
bgneal@294:             title=row['title'].decode('latin-1'),
bgneal@294:             url=row['url'].decode('latin-1'),
bgneal@294:             description=row['description'].decode('latin-1'),
bgneal@294:             user=self.get_user(row['submitter']),
bgneal@294:             date_added=datetime.datetime.strptime(row['date'], "%Y-%m-%d %H:%M:%S"),
bgneal@294:             hits=int(row['hits']),
bgneal@294:             is_public=True)
bgneal@294:         link.save()