Meetup django common_problems(1)

2. Who is this fool?!A little about me

3. Graphic ArtPhotographyWeb DesignDjangoVFXJavaScriptPrint DesignSoftwareDigital MediaCSSPythonFlash / Flex

5. PERL & JavaScript

7. Django = HotPileOfAwesome( yes=True )Django.build_web_app( fast=True )

8. Django.make_an_app()>>> TrueDjango.log_in_user()>>> TrueDjango.comment_on_my_model()>>> TrueDjango.message_my_user(user='myuser')>>> TrueDjango.send_emails( emails=['[email protected]'] )>>> TrueDjango.do_complex_SQL( please=True )>>> No Problem!

9. Django.make_a_thumbnail()>>> Thumbnail?Django.send_text_message()>>> Email Exception: no such thingDjango.search_all_my_stuff()>>> WTF?Django.get_data_in_under_75_queries()>>> Whoa...Django.alter_table(model='MyModel')>>> Let's not get crazyDjango.be_restful( now=True )>>> you meanrequest.POST

10. I've Got an app for that!

11. Searching

12. SearchingFind Stuff - Fast

13. SearchingFind Stuff - Fast( without crushing my DB )

14. Haystackhaystacksearch.orgDjapiancode.google.com/p/djapian/Sphinxdjango-sphinx ( github )

15. DjangoMyModel.objects.filter( text__icontains='word' )OR MyModel.objects.filter( text__search='word' )Problems:single model

16. slow

17. mysql

18. manual DB configsHaystackclassPostIndex( SearchIndex ): body = CharField(document = True, model_attr = 'body') title = CharField( model_attr = 'title') author = CharField( model_attr = 'author__get_full_name')text = CharField( use_template = True ) defget_queryset( self ): return Post.objects.all() defprepare_url( self, obj ): return obj.get_absolute_url() site.register(Post, PostIndex)

19. HaystackSearchQuerySet().filter( SQ(field=True) | SQ(field__relation="something") ~SQ(field=False) )>>> [ <SearchResult>, <SearchResult>, <SearchResult> ]

20. XapianclassArticleIndexer( Indexer ):fields = ['title','body']tags = [('title','title', 3),('body', 'as_plain_text', 1)]space.add_index(Article, ArticleIndexer, attach_as='indexer')

21. Xapianfromdjapian.indexer import CompositeIndexerflags = xapian.QueryParser.FLAG_PARTIAL| \xapian.QueryParser.FLAG_WILDCARDindexers = [ Model_1.indexer, Model_2.indexer ]comp = CompositeIndexer( *indexers )s = comp.search( `a phrase` ).flags( flags )>>> [ <hit:score=100>,<hit:score=98> ]$ s[0].instance>>> <ModelInstance:Model>

22. HaystackXapianIndex filesClass Based IndexCustomize Text For IndexingLink to Indexed ObjectIndex Fields, Methods & RelationsStemming, Facetting, Highlighting, SpellingPluggable Architecture

23. Whole Word Matching

24. Loads all indexers

25. Multiple Index Hooks

26. Stored fields

27. Django-like Syntax

28. Templates & Tags

29. Views, Forms & Fields

30. Wildcard Matching

31. Partial word matching

32. Doesn't Load All indexers

33. Interactive shell

34. Close to the metal ( Control )

35. Watches Models for changes

36. Pre-index FilteringREST API

37. REST APIExposing Your Data

38. REST APIExposing Your Data( In a meaningful way )

39. Djangodefview_func( reqeuest, *args, **kwargs): request.GET request.POST request.FILESProblems:PUT & DELETE not translated

40. Can't restrict access based on HTTP methods

41. Serialization is left up to you

42. Manual auth

43. Tons of URLsPISTONbitbucket.org/jespern/django-pistonTASTYPIEtoastdriven.github.com/django-tastypie/

44. PistonclassMyHandler( BaseHandler ): methods_allowed =( 'GET', 'PUT') model = MyModel classMyOtherHandler( BaseHandler ): methods_allowed =( 'GET', 'PUT') model = MyOtherModelfields = ('title','content',('author',('username',) ) )exclude = ('id', re.compile(r'^private_'))defread( self, request):return [ x for x in MyOtherModel.objects.select_related() ]defupdate( self, request ):...

45. TastypieclassMyResource( ModelResource ):fk_field = fields.ForiegnKey( OtherResource, 'fk_field' ) classMeta:authentication = ApiKeyAuthentication() queryset = MyModel.object.all()resource_name = 'resource'fields = ['title', 'content', ]allowed_methods = [ 'get' ]filtering = {'somfield': ('exact', 'startswith')}defdehydrate_FOO( self, bundle ):return bundle.data[ 'FOO' ] = 'What I want'

46. Tastypie - Client SidenewRequest.JSONP({url:'http://www.yoursite.com/api/resource',method:'get',data:{username:'billyblanks',api_key:'5eb63bbbe01eeed093cb22bb8f5acdc3',title__startswith:"Hello World"},onSuccess: function( data ){console.info( data.meta );console.log( data.objects ):}).send();http://www.yoursite.com/api/resource/1http://www.yoursite.com/api/resource/set/1;5http://www.yoursite.com/api/resource/?format=xml

47. PISTONTASTYPIEMultiple FormatsThrottlingAll HTTP MethodsAuthenticationArbitrary Data ResourcesHighly ConfigurableDjango-like

48. Built in fields

49. Auto Meta Data

50. Resource URIs

51. ORM ablities ( client )

52. API Key Auth

53. Object Caching ( backends )

54. De / Re hydrations hooks

55. Validation Via Forms

56. Deep ORM Ties

57. Data Streaming

58. OAuth / contrib Auth

59. URI Templates

60. Auto API DocsREADY IN MINUTES

61. DATABASE

62. DJANGO-SOUTHsouth.aeracode.orgQUERYSET-TRANSFORMgithub.com/jbalogh/django-queryset-transformDJANGO-SELECTREVERSEcode.google.com/p/django-selectreverse

63. SOUTH

64. SOUTHDatabase Migrations

65. DJANGO$ python manage.py syncdb

66. DJANGO$ python manage.py syncdb>>> You have a new Database!

67. DJANGOclassMyModel( models.Model):relation = models.ForiegnKey( Model2 )

68. DJANGOclassMyModel( models.Model ):relation = models.ForiegnKey( Model2 )classMyModel( models.Model ):relation = models.ManyToMany( Model2 )

69. DJANGO$ python manage.py syncdb

70. DJANGO$ python manage.py syncdb>>> Sucks to be you!

71. WTF?!

72. DJANGO$ python manage.py syncdb>>> Sucks to be you!Problem:syncdb doesn't really sync your db. Migrations must be done manually.For everyedatabase / set up.SOUTHMigrations are a set of sequential .py filesdb agnosticHandle most relation typesRolls migrations forward Handles Dependancies / Reverse DependanciesCan convert existing apps Overrides existing syncdb commandDJANGOclassMyModel( models.Model ):relation = models.ForiegnKey( Model2 )classMyModel( models.Model ):relation = models.ManyToMany( Model2 )

73. DJANGOclassMyModel( models.Model ):relation = models.ForiegnKey( Model2 )classMyModel( models.Model ):relation = models.ManyToMany( Model2 )

74. SOUTH$ python manage.py schemamigration <yourapp>>>> Sweet, run migrate

75. SOUTH$ python manage.py migrate <yourapp>>>> Done.

76. SOUTH

77. QUERYSET-TRANSFORMgithub.com/jbalogh/django-queryset-transform( n + 1 )

78. QUERYSET-TRANSFORM{%for object in object_list %}{%for object in object.things.all %}{%if object.relation %}{{ object.relation.field.text }}{%else%}{{ object.other_relation }}{%endif%}{%endfor%}{%empty%}no soup for you{%endfor%}

80. QUERYSET-TRANSFORMdeflookup_tags(item_qs):item_pks = [item.pk for item in item_qs]m2mfield = Item._meta.get_field_by_name('tags')[0]tags_for_item = \Tag.objects.filter(item__in = item_pks).extra(select = {'item_id': '%s.%s' % (m2mfield.m2m_db_table(),m2mfield.m2m_column_name()) }) tag_dict = {}for tag in tags_for_item:tag_dict.setdefault(tag.item_id, []).append(tag)for item in item_qs:item.fetched_tags = tag_dict.get(item.pk, [])

81. QUERYSET-TRANSFORMqs = Item.objects.filter(name__contains = 'e').transform(lookup_tags)

82. QUERYSET-TRANSFORMfrom django.db import connectionlen( connection.queries )>>> 2

83. DJANGO-SELECTREVERSEcode.google.com/p/django-selectreverse

84. DJANGO-SELECTREVERSETries prefetching on reverse relationsmodel_instance.other_model_set.all()

85. CONTENT MANAGEMENT

86. DJANGO-CMSwww.django-cms.orgWEBCUBE-CMSwww.webcubecms.comSATCHMOwww.satchmoproject.com

87. WEBCUBE-CMS

88. WEBCUBE-CMSFeature Complete

89. WEBCUBE-CMSFeature CompleteRobust & Flexible

90. WEBCUBE-CMSFeature CompleteRobust & Flexible( Commercial License )

91. $12,000

92. $12,000

94. + $300 / mo

95. WTF?!

96. DJANGO-CMS

98. PROCONHeavily Customised Admin

99. Plugin Support

100. Template Switching

101. Menu Control

102. Translations

103. Front-End Editing ( latest )

104. Moderation

105. Template Tags

106. Lots of settings

107. Lots Of Settings ( again )

108. Another Learning Curve

109. Plone Paradox

110. Plugins a little wonkySATCHMO

111. SATCHMOE-Commerce-y CMS

112. Django Admin

113. DJANGO-GRAPPELLIcode.google.com/p/django-grappelliDJANGO-FILEBROWSEcode.google.com/p/django-filebrowserDJANGO-ADMIN TOOLSbitbucket.org/izi/django-admin-tools

114. GRAPPELLI

115. GRAPPELLI

116. GRAPPELLI

117. FILEBROWSER

118. FILEBROWSER

119. FILEBROWSER

120. FILEBROWSER

121. ADMIN TOOLS

122. ADMIN TOOLS

123. ADMIN TOOLS

124. Image Management

125. DJANGO-IMAGEKITbitbucket.org/jdriscoll/django-imagekitDJANGO-PHOTOLOGUEcode.google.com/p/django-photologueSORL-THUMBNAILthumbnail.sorl.net/

126. DJANGOclassMyModel( models.Model ):image = models.ImageField(upload_to='/' )

127. DJANGOclassMyModel( models.Model ):image = models.ImageField( upload_to='/' )thumb = models.ImageField( upload_to='/' )

128. DJANGOclassMyModel( models.Model ):image = models.ImageField( upload_to='/' )thumb = models.ImageField( upload_to='/' )>>> MyModel.objects.get(pk=1)>>> MyModel.objects.image.url>>> MyModel.objects.thumb.url

129. ImageField

130. ImageFieldIt Kinda Sucks

131. IMAGEKITEvolution Of Photologue

132. IMAGEKITclassPhoto( ImageModel ):name = models.CharField(max_length=100)image = models.ImageField(upload_to='photos') views = models.PositiveIntegerField(default=0)classIKOptions:#define the ImageKit optionsspec_module = 'myapp.specs'cache_dir = 'photos'image_field = 'image'save_count_as = 'views'

133. IMAGEKITclassResizeThumb( processors.Resize ):width = 100height = 75crop = TrueclassResizeDisplay( processors.Resize ):width = 600# now we can define our thumbnail specclassThumbnail( ImageSpec ):access_as = 'thumbnail_image'pre_cache = Trueprocessors = [ ResizeThumb ]classDisplay( ImageSpec ):increment_count = Trueprocessors = [ ResizeDisplay ]

134. IMAGEKIT$ photo = Photo.objects.get( pk =1 )$ photo.display.url>>> u'/path/to/media/photo_display.jpg'$ photo.thumbnail.width>>> 100

135. IMAGEKITPHOTLOGUECachingTemplate FriendlyHighly ConfigurableManagement CommandsOnly 1 Model

136. DB Friendly

137. Format Adjustment

138. Color Adjustment

139. Transposing

140. Galleries out of the box

141. Bulk Upload

142. Admin Integration

143. Pre-cache command

144. Very DB Dependant

145. 4 Models ( 2 Solid )

146. Templates / Views / Urls

147. Exif SupportEXIF TAGSISSUE 153( shameless plug )

148. IMAGEKITPHOTLOGUECachingTemplate FriendlyHighly ConfigurableManagement CommandsOnly 1 Model

149. DB Friendly

150. Format Adjustment

151. Color Adjustment

152. Transposing

153. Galleries out of the box

154. Bulk Upload

155. Admin Integration

156. Pre-cache command

157. Very DB Dependant

158. 4 Models ( 2 Solid )

159. Exif SupportBeware of View Counts

160. ImageField

161. ImageFieldIt's Kinda Messy

162. SORL

163. SORLfrom sorl.thumbnail import ImageFieldclassMyModel( models.Model ):iamge = ImageField( upload_to="/folder" )

164. SORL{% load thumbnail %}{%thumbnail obj.image "1000x600" crop='top' as im %}<img src="{{ im.url }}" />{%endthumbnail%}

165. MESSAGING

166. User - to - UserMessaging

167. DJANGO-POSTMANbitbucket.org/psam/django-postmanDJANGO-MESSAGEScode.google.com/p/django-messagesDJANGO-SMScode.google.com/p/django-sms

168. DJANGO-SMS

169. DJANGO-SMSUser Enters Phone #User Selects Carrier

170. THATS IT

171. FREE

172. UTILS

173. DJANGO-EXTENSIONSgithub.com/django-extensions/django-extensionsDEBUG-TOOLBARgithub.com/robhudson/django-debug-toolbarDJANGO-MAINTENANCEMODEpypi.python.org/pypi/django-maintenancemodeDJANGO-PAGINATIONgithub.com/ericflo/django-paginationDJANGO-GUARDIANgithub.com/lukaszb/django-guardianHOTSAUCE( self plug )

174. DJANGO-EXTENSIONS21 Commands4 Fields2 Models1 Admin Extension ( FK AutoComplete )$ python manage.py dumpscript>>> your_app.py$ python manage.py runscript>>> your_app.pyc$ python manage.py runserver_plus>>> Debugger baked right in$ python manage.py shell_plus>>> AutoLoad Models$ python manage.py show_urls>>> /your/endpoint/:idproject.app.views.view_func

175. RUNSERVER_PLUS

176. DEBUG TOOLBAR

177. DEBUG TOOLBAR

178. MAINTENANCEMODE

179. MAINTENANCEMODEMAINTENANCE_MODE = True

182. HOTSAUCE

183. HOTSAUCEI Put That $*!T On Everything

184. HOTSAUCE

185. HOTSAUCE

186. HOTSAUCEQueueItemChangeSettitlecontentModel AChangeSettitlecontentChangeSetModel AChangeSettitlecontent

187. HOTSAUCE

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