Django

Transcript

1. So you want to use DJANGO AND MONGODB @flaper87
2. THAT’S COOL, but you n d to know A COUPLE OF THINGS DJANGO AND MONGODB
3. LIKE: WHAT ARE THE OPTIONS?
4. An object-document mapper to connect Python and MongoDB ( http://mongoengine.org )
5. Another ODM that takes mongodb into the web Mongokit ( http://namlook.github.com/mongokit/ )
6. OR, OF COURSE
7. DJANGO MONGODB ENGINE (A MongoDB backend for Django)
8. DJANGO-NONREL A good and up to date Django fork that brings non-rel support
9. django.contrib.* Sadly, some of your may be broken, but not the admin
10. erm... OKAY WHAT’S SO COOL ABOUT THIS THEN?
11. No anges n ded. WHAT’S SO COOL ABOUT THIS THEN?
12. No anges n ded. NOBODY’S GONNA TOUCH YOUR PRECIOUS BUILTINS. ABOUT THIS THEN?
13. NOBODY’S GONNA TOUCH YOUR PRECIOUS BUILTINS. REDUCED IMPEDANCE MISSMATCH
14. WHAT ELSE? at’s c l
15. NEW FIELDS
16. AGGREGATIONS
17. GRIDFS
18. CACHING
19. MAP / REDUCE >>> for pair in Article.objects.map_reduce(_map, _reduce, 'wordcount'): ... print pair.key, pair.value
20. NEW INDEXES class Club(models.Model): location = ListField() rating = models.FloatField() ... class MongoMeta: indexes = [ [('rating', -1)], {'fields': [('location', '2d')], 'min': -42, 'max': 42}, ]
21. TONS OF DOCS Plus: (which never hurts)
22. Su estions
23. RAW QUERIES MyModel.objects.raw_query(field=“value”)
24. EMBEDD IF POSSIBLE class Comment(models.Model): created_on = models.DateTimeField() author = EmbeddedModelField('Author') text = models.TextField()
25. RE-THINK YOUR MODELS class Post(models.Model): title = models.CharField() text = models.TextField() tags = ListField() # Note: Use defer comments = ListField(EmbeddedModelField('Comment'))
26. DO NOT USE IT EVERYWHERE MONGODB_MANAGED_APPS = ['myapp'] MONGODB_MANAGED_MODELS = ['myapp.MongoDBModel']
27. SERVE STATIC FILES GridFSStorage + nginx-GridFS
28. AGGREGATIONS? MAP/REDUCE class Min(MongoAggregate): initial_value = float('inf') reduce_template = '{alias} = ({lookup}<{alias})?{lookup}:{alias}' class Max(MongoAggregate): initial_value = float('-inf') reduce_template = '{alias} = ({lookup}>{alias})?{lookup}:{alias}'
29. DATES WORK But, MongoDB does not support month/day queries
30. DO NOT TRY TO MIGRATE It Wont Work!
31. CONTRIBUTE The Compiler’s a mess
32. A away Contribute: http://django-mongodb.org /meta/contributing.html http://groups.google.com /group/django-non-relational