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1 """
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2 import_old_links.py - For importing links from SG101 1.0 as csv files.
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3 """
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4 from __future__ import with_statement
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5 import csv
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6 import datetime
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7
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8 from django.core.management.base import LabelCommand, CommandError
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9 from django.contrib.auth.models import User
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10
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11 from weblinks.models import Link, Category
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12
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13
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14 class Command(LabelCommand):
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15 args = '<filename filename ...>'
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16 help = 'Imports weblinks from the old database in CSV format'
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17
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18 def handle_label(self, filename, **options):
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19 """
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20 Process each line in the CSV file given by filename by
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21 creating a new weblink object and saving it to the database.
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22
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23 """
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24 self.cats = {}
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25 try:
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26 self.default_user = User.objects.get(pk=2)
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27 except User.DoesNotExist:
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28 raise CommandError("Need a default user with pk=2")
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29
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30 try:
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31 with open(filename, "rb") as f:
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32 self.reader = csv.DictReader(f)
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33 try:
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34 for row in self.reader:
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35 self.process_row(row)
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36 except csv.Error, e:
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37 raise CommandError("CSV error: %s %s %s" % (
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38 filename, self.reader.line_num, e))
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39
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40 except IOError:
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41 raise CommandError("Could not open file: %s" % filename)
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42
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43 def get_category(self, row):
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44 """
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45 Return the Category object for the row.
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46
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47 """
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48 cat_id = row['cid']
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49 if cat_id not in self.cats:
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50 try:
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51 cat = Category.objects.get(pk=cat_id)
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52 except Category.DoesNotExist:
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53 raise CommandError("Category does not exist: %s on line %s" % (
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54 cat_id, self.reader.line_num))
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55 else:
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56 self.cats[cat_id] = cat
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57 return self.cats[cat_id]
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58
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59 def get_user(self, username):
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60 """
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61 Return the user object for the given username.
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62 If the user cannot be found, self.default_user is returned.
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63
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64 """
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65 try:
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66 return User.objects.get(username=username)
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67 except User.DoesNotExist:
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68 return self.default_user
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69
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70 def process_row(self, row):
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71 """
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72 Process one row from the CSV file: create an object for the row
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73 and save it in the database.
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74
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75 """
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76 link = Link(category=self.get_category(row),
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77 title=row['title'].decode('latin-1'),
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78 url=row['url'].decode('latin-1'),
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79 description=row['description'].decode('latin-1'),
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80 user=self.get_user(row['submitter']),
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81 date_added=datetime.datetime.strptime(row['date'], "%Y-%m-%d %H:%M:%S"),
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82 hits=int(row['hits']),
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83 is_public=True)
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84 link.save()
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