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Tips & Tricks
by Renyi Khor
renyi.ace@gmail.com
@renyikhor
https://github.com/renyi/django-tips-and-tricks
Wednesday, June 19, 13
4. Disclaimer
• I’m not a super pro pythonista, but I’m a
very lazy one.
• Speed - means programmer’s programming
speed, unless specified otherwise.
Wednesday, June 19, 13
5. Disclaimer
• I’m not a super pro pythonista, but I’m a
very lazy one.
• Speed - means programmer’s programming
speed, unless specified otherwise.
• I like to do things as short and as easy as
possible.
Wednesday, June 19, 13
6. Disclaimer
• I’m not a super pro pythonista, but I’m a
very lazy one.
• Speed - means programmer’s programming
speed, unless specified otherwise.
• I like to do things as short and as easy as
possible.
• DRYKISS =
Don’t repeat yourself + Keep it super simple
Wednesday, June 19, 13
7. ACE EdVenture Pixel
Head of R&D and Lead Developer
SchoolHub
School Management System
What we use python for ?
SchoolHub is built on top of Django Web Framework
Wednesday, June 19, 13
8. ACE EdVenture Studio
Head of R&D
ChemQuest: Petticles in Peril
Chemistry based RPG game.
What we use python for ?
Most of the web components are built with
Django Web Framework
(Web login, Game Achievements, etc.)
Wednesday, June 19, 13
11. • use lists[] instead of tuples() in default_settings.py
• Use list methods - add(), remove(), +=
• Default naming convention to project name
• use project as default “theme” app for project
Wednesday, June 19, 13
12. 1 # default_settings.py
2
3 DEBUG = False
4 TEMPLATE_DEBUG = False
5 USE_SOUTH = True
6 ADMINS = [('Devtune Admin', 'admin@devtune.biz')]
7 MANAGERS = ADMINS
8 USE_I18N = True
9 USE_L10N = True
10 LANGUAGE_CODE = "en-gb"
11 USE_TZ = True
12 TIME_ZONE = 'Asia/Kuala_Lumpur'
13 INTERNAL_IPS = ["127.0.0.1"]
14 SESSION_ENGINE = 'django.contrib.sessions.backends.cached_db'
15 SESSION_EXPIRE_AT_BROWSER_CLOSE = True
16 SITE_ID = 1
17 STATIC_URL = '/static/'
18 MEDIA_URL = '/media'
19 INSTALLED_APPS = [
20 "django.contrib.admin",
21 "django.contrib.auth",
22 "django.contrib.contenttypes",
23 "django.contrib.sessions",
24 "django.contrib.sites",
25 "django.contrib.sitemaps",
26 "django.contrib.staticfiles",
27 "compressor",
28 ]
Wednesday, June 19, 13
13. 1 # settings.py
2
3 from .default_settings import *
4
5 # Inserts default theme app
6 INSTALLED_APPS.insert(1, "my_project.themes.default")
7
8 # Removes CSRF checking
9 if "django.middleware.csrf.CsrfViewMiddleware" in MIDDLEWARE_CLASSES:
10 MIDDLEWARE_CLASSES.remove("django.middleware.csrf.CsrfViewMiddleware")
11
12 # LOCAL SETTINGS #
13 try:
14 from local_settings import *
15 except ImportError:
16 pass
17
18 # DYNAMIC SETTINGS #
19 try:
20 from mezzanine.utils.conf import set_dynamic_settings
21 except ImportError:
22 pass
23 else:
24 set_dynamic_settings(globals())
Wednesday, June 19, 13
14. 1 # settings.py
2
3 import os
4 PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
5 PROJECT_DIRNAME = PROJECT_ROOT.split(os.sep)[-1]
6
7 # User project directory name as default "theme" app
8 INSTALLED_APPS.insert(1, "%s" % PROJECT_DIRNAME)
9
10 ROOT_URLCONF = '%s.urls' % PROJECT_DIRNAME
11 CACHE_MIDDLEWARE_KEY_PREFIX = '%s' % PROJECT_DIRNAME
12 CACHE_MIDDLEWARE_ALIAS = '%s' % PROJECT_DIRNAME
13 CSRF_COOKIE_NAME = '%s_csrftoken' % PROJECT_DIRNAME
14 LANGUAGE_COOKIE_NAME = '%s_language' % PROJECT_DIRNAME
15 SESSION_COOKIE_NAME = '%s_session' % PROJECT_DIRNAME
16 STATIC_ROOT = '/static/%s/' % PROJECT_DIRNAME
17 MEDIA_ROOT = '/media/%s/' % PROJECT_DIRNAME
18 WSGI_APPLICATION = '%s.wsgi.application' % PROJECT_DIRNAME
19
20 # Celery
21 BROKER_VHOST = PROJECT_DIRNAME
22 BROKER_URL = '%s%s' % (BROKER_URL, BROKER_VHOST)
23
24 DATABASES = {
25 "default": {
26 "ENGINE": "django.db.backends.postgresql_psycopg2",
27 "NAME": "%s" % PROJECT_DIRNAME,
28 "HOST": "127.0.0.1",
29 }
30 }
31
32 CACHES = {
33 'default': {
34 'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
35 'LOCATION': ['127.0.0.1:11211'],
36 'KEY_PREFIX': '%s' % PROJECT_DIRNAME,
37 }
38 }
Wednesday, June 19, 13
15. 1 # settings.py
2
3 import os
4 PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
5 PROJECT_DIRNAME = PROJECT_ROOT.split(os.sep)[-1]
6
7 # User project directory name as default "theme" app
8 INSTALLED_APPS.insert(1, "%s" % PROJECT_DIRNAME)
9
10 ROOT_URLCONF = '%s.urls' % PROJECT_DIRNAME
11 CACHE_MIDDLEWARE_KEY_PREFIX = '%s' % PROJECT_DIRNAME
12 CACHE_MIDDLEWARE_ALIAS = '%s' % PROJECT_DIRNAME
13 CSRF_COOKIE_NAME = '%s_csrftoken' % PROJECT_DIRNAME
14 LANGUAGE_COOKIE_NAME = '%s_language' % PROJECT_DIRNAME
15 SESSION_COOKIE_NAME = '%s_session' % PROJECT_DIRNAME
16 STATIC_ROOT = '/static/%s/' % PROJECT_DIRNAME
17 MEDIA_ROOT = '/media/%s/' % PROJECT_DIRNAME
18 WSGI_APPLICATION = '%s.wsgi.application' % PROJECT_DIRNAME
19
20 # Celery
21 BROKER_VHOST = PROJECT_DIRNAME
22 BROKER_URL = '%s%s' % (BROKER_URL, BROKER_VHOST)
23
24 DATABASES = {
25 "default": {
26 "ENGINE": "django.db.backends.postgresql_psycopg2",
27 "NAME": "%s" % PROJECT_DIRNAME,
28 "HOST": "127.0.0.1",
29 }
30 }
31
32 CACHES = {
33 'default': {
34 'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
35 'LOCATION': ['127.0.0.1:11211'],
36 'KEY_PREFIX': '%s' % PROJECT_DIRNAME,
37 }
38 }
Wednesday, June 19, 13
16. 1 # settings.py
2
3 import os
4 PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
5 PROJECT_DIRNAME = PROJECT_ROOT.split(os.sep)[-1]
6
7 # User project directory name as default "theme" app
8 INSTALLED_APPS.insert(1, "%s" % PROJECT_DIRNAME)
9
10 ROOT_URLCONF = '%s.urls' % PROJECT_DIRNAME
11 CACHE_MIDDLEWARE_KEY_PREFIX = '%s' % PROJECT_DIRNAME
12 CACHE_MIDDLEWARE_ALIAS = '%s' % PROJECT_DIRNAME
13 CSRF_COOKIE_NAME = '%s_csrftoken' % PROJECT_DIRNAME
14 LANGUAGE_COOKIE_NAME = '%s_language' % PROJECT_DIRNAME
15 SESSION_COOKIE_NAME = '%s_session' % PROJECT_DIRNAME
16 STATIC_ROOT = '/static/%s/' % PROJECT_DIRNAME
17 MEDIA_ROOT = '/media/%s/' % PROJECT_DIRNAME
18 WSGI_APPLICATION = '%s.wsgi.application' % PROJECT_DIRNAME
19
20 # Celery
21 BROKER_VHOST = PROJECT_DIRNAME
22 BROKER_URL = '%s%s' % (BROKER_URL, BROKER_VHOST)
23
24 DATABASES = {
25 "default": {
26 "ENGINE": "django.db.backends.postgresql_psycopg2",
27 "NAME": "%s" % PROJECT_DIRNAME,
28 "HOST": "127.0.0.1",
29 }
30 }
31
32 CACHES = {
33 'default': {
34 'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
35 'LOCATION': ['127.0.0.1:11211'],
36 'KEY_PREFIX': '%s' % PROJECT_DIRNAME,
37 }
38 }
Wednesday, June 19, 13
17. 1 # local_settings.py
2 # (developer's version)
3
4 DEBUG = True
5 TEMPLATE_DEBUG = DEBUG
6 COMPRESS_ENABLED = False
7
8 DATABASES = {
9 "default": {
10 "ENGINE": "django.db.backends.sqlite3",
11 "NAME": "dev.db",
12 }
13 }
14
15 CACHES = {
16 'default': {
17 'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
18 }
19 }
20
21
22 CELERY_CACHE_BACKEND = "dummy"
23 EMAIL_BACKEND = 'kopio.core.mailer.backend.DbBackend'
24 MAILER_EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
25 SESSION_ENGINE = "django.contrib.sessions.backends.signed_cookies"
Wednesday, June 19, 13
19. • boilerplate default urls (index.html, etc.)
• load urls according to settings.INSTALLED_APPS
Wednesday, June 19, 13
20. 1 # urls.py
2
3 from django.conf.urls import patterns, include, url
4
5
6 urlpatterns = patterns('',
7 ('', include("default_app.urls")),
8 ('', include("mezzanine.urls")),
9 )
Wednesday, June 19, 13
21. 1 # default_urls.py
2
3 urlpatterns = patterns('',
4 # Default index.html
5 url(r'^$', TemplateView.as_view(template_name='index.html'), name="home"),
6
7 # Default favicon
8 url(r'^favicon.ico/$', RedirectView.as_view(url='/static/img/favicon.
9 ico'), name="favicon"),
10 )
11
12 # Default robots.txt
13 urlpatterns += patterns('',
14 url(r'^robots.txt/$', TemplateView.as_view(template_name='robots.txt')),
15 )
16
17 # Admin urls
18 if "django.contrib.admin" in settings.INSTALLED_APPS:
19 from django.contrib import admin
20 admin.autodiscover()
21
22 urlpatterns += patterns("",
23 (r"^admin/", include(admin.site.urls)),
24 )
25
26 # Other apps
27 if "userena" in settings.INSTALLED_APPS:
28 urlpatterns += patterns("",
29 (r'^users/', include('userena.urls')),
30 )
31
32 if "selectable" in settings.INSTALLED_APPS:
33 urlpatterns += patterns("",
34 url(r"^selectable/", include("selectable.urls")),
35 )
36
37 if "actstream" in settings.INSTALLED_APPS:
38 urlpatterns += patterns("",
39 ('^activity/', include('actstream.urls')),
40 )
Wednesday, June 19, 13
22. 1 # default_urls.py
2
3 urlpatterns = patterns('',
4 # Default index.html
5 url(r'^$', TemplateView.as_view(template_name='index.html'), name="home"),
6
7 # Default favicon
8 url(r'^favicon.ico/$', RedirectView.as_view(url='/static/img/favicon.
9 ico'), name="favicon"),
10 )
11
12 # Default robots.txt
13 urlpatterns += patterns('',
14 url(r'^robots.txt/$', TemplateView.as_view(template_name='robots.txt')),
15 )
16
17 # Admin urls
18 if "django.contrib.admin" in settings.INSTALLED_APPS:
19 from django.contrib import admin
20 admin.autodiscover()
21
22 urlpatterns += patterns("",
23 (r"^admin/", include(admin.site.urls)),
24 )
25
26 # Other apps
27 if "userena" in settings.INSTALLED_APPS:
28 urlpatterns += patterns("",
29 (r'^users/', include('userena.urls')),
30 )
31
32 if "selectable" in settings.INSTALLED_APPS:
33 urlpatterns += patterns("",
34 url(r"^selectable/", include("selectable.urls")),
35 )
36
37 if "actstream" in settings.INSTALLED_APPS:
38 urlpatterns += patterns("",
39 ('^activity/', include('actstream.urls')),
40 )
Wednesday, June 19, 13
23. 1 # urls.py
2
3 # Media and Static files for development
4 if settings.DEBUG:
5 # Static files
6 from django.contrib.staticfiles.urls import staticfiles_urlpatterns
7 urlpatterns += staticfiles_urlpatterns()
8
9 # Media files
10 from django.conf.urls.static import static
11 urlpatterns += static(settings.MEDIA_URL, document_root=settings.
12 MEDIA_ROOT)
Wednesday, June 19, 13
25. • Automatically load all apps in a directory.
• Useful for plugins*
• For more complex usage, .autodiscover()
might be a better choice
Wednesday, June 19, 13
26. 1 # installed_plugins_list.py
2
3 def installed_plugins_list(plugin_path=None):
4 """Function to get a list of plugins from plugin_path
5 """
6 import os
7
8 path = os.path.dirname(__file__)
9 path = os.path.join(path, plugin_path)
10
11 installed_plugins = []
12 for module in os.listdir(path):
13 if os.path.isdir(path + '/' + module) == True:
14 installed_plugins.append(module)
15 return installed_plugins
Wednesday, June 19, 13
27. 1 ##########################
2 # LABS SETTINGS #
3 ##########################
4 # Developer's playground #
5 # Play at ur own risk #
6 ##########################
7
8 if LABS_ENABLED and not "sis.labs" in INSTALLED_APPS:
9 from .installed_plugins_list import installed_plugins_list
10
11 TEMPLATE_CONTEXT_PROCESSORS += [
12 "sis.context_processors.sis_labs"
13 ]
14
15 # Loads all modules from sis.plugins
16 for plugin in installed_plugins_list('plugins'):
17 INSTALLED_APPS.insert(0, "sis.plugins.%s" % plugin)
18
19 # Loads all modules from sis.labs.ui
20 for plugin in installed_plugins_list('labs/ui'):
21 INSTALLED_APPS.insert(0, "sis.labs.ui.%s" % plugin)
22
23 # Loads all modules from sis.labs.apps
24 INSTALLED_APPS.append('sis.labs')
25 for plugin in installed_plugins_list('labs/app'):
26 INSTALLED_APPS.append(0, "sis.labs.app.%s" % plugin)
Wednesday, June 19, 13
29. • Themes are just Django apps.
• Actually, themes are Django app with static
files and templates.
• Themes can be overridden, just like how
we override templates.
• For more information,
https://github.com/renyi/mezzanine-themes
Wednesday, June 19, 13
32. 1. Use main app as theme
# directory structure
my_project/my_app/templates
my_project/my_app/static
# in settings.py
INSTALLED_APPS.insert(1, "my_app")
Wednesday, June 19, 13
33. 2. Have a dedicated theme
directory
# directory structure
my_project/my_app/themes/default/templates
my_project/my_app/themes/default/static
# in settings.py
INSTALLED_APPS.insert(1, "my_app.themes.default")
Wednesday, June 19, 13
35. • {% overextends %} is written by
@stephen_mcd for Mezzanine CMS.
• Also available as pluggable app.
https://github.com/stephenmcd/django-
overextends
• Allows circular template inheritance.
(base.html can “extend” base.html)
• This allows for simple way of managing
plugable apps (javascripts libraries, etc.) or
let’s call it “plugins”.
Wednesday, June 19, 13
36. 1 <!-- my_app/templates/index.html -->
2 {% extends "base.html" %}
3
4
5 {% block header %}
6 <h1>Hello Title</h1>
7 {% endblock %}
8
9
10 {% block main %}
11 <p>Hello Body</p>
12 {% endblock %}
Wednesday, June 19, 13
37. 1 <!-- my_app/templates/base.html -->
2 <!DOCTYPE html>
3 <head>
4 <meta charset="utf-8">
5 {% block base_styles %}{% endblock %}
6 </head>
7 <body>
8 <header id="header">
9 {% block header %}{% endblock %}
10 </header>
11
12 <div role="main" id="main">
13 {% block main %}{% endblock %}
14 </div>
15
16 <footer id="footer">
17 {% block footer %}{% endblock %}
18 </footer>
19
20 {% block js_libs %}{% endblock %}
21 </body>
22 </html>
Wednesday, June 19, 13
39. 1 <!-- my_app/plugins/bootstrap/templates/base.html -->
2 {% overextends "base.html" %}
3
4
5 {% block base_styles %}
6 {{ block.super }}
7 <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.
8 1/css/bootstrap-combined.min.css" rel="stylesheet">
9 {% endblock %}
10
11
12 {% block js_libs %}
13 {{ block.super }}
14 <script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.
15 1/js/bootstrap.min.js"></script>
16 {% endblock %}
Wednesday, June 19, 13
40. 2 <!DOCTYPE html>
3 <head>
4 <meta charset="utf-8">
5
6 <!-- block base_styles -->
7 <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.
8 1/css/bootstrap-combined.min.css" rel="stylesheet">
9 <!-- endblock -->
10 </head>
11 <body>
12 <header id="header">
13 <!-- block header_styles -->
14 <h1>Hello Title</h1>
15 <!-- endblock -->
16 </header>
17
18 <div role="main" id="main">
19 <!-- block main_styles -->
20 <p>Hello Body</p>
21 <!-- endblock -->
22 </div>
23
24 <footer id="footer">
25 <!-- block footer_styles -->
26 <!-- endblock -->
27 </footer>
28
29 <!-- block js_libs -->
30 <script src="//code.jquery.com/jquery-1.8.3.min.js"></script>
31 <script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.
32 1/js/bootstrap.min.js"></script>
33 <!-- endblock -->
34 </body>
35 </html>
Wednesday, June 19, 13
41. 1 INSTALLED_APPS = [
2 "my_app.themes.default",
3 "my_app.plugins.jquery",
4 "my_app.plugins.bootstrap",
5 ...
6 ]
Inheritance priority
Wednesday, June 19, 13
44. 1 # models.py
2
3 from django.db import models
4
5
6 class School(models.Model):
7 title = models.CharField(_("Title"), max_length=500)
8 slug = models.CharField(_("URL"), max_length=2000)
9
10 def __unicode__(self):
11 return self.title
12
13 def save(self, *args, **kwargs):
14 """
15 Create a unique slug by appending an index.
16 """
17 pass
18
19 def get_slug(self):
20 """
21 Allows subclasses to implement their own slug creation logic.
22 """
23 return slugify(self.title)
Wednesday, June 19, 13
45. 36 class Slugged(models.Model):
37 title = models.CharField(_("Title"), max_length=500)
38 slug = models.CharField(_("URL"), max_length=2000)
39
40 class Meta:
41 abstract = True
42
43 def __unicode__(self):
44 return self.title
45
46 def save(self, *args, **kwargs):
47 """
48 Create a unique slug by appending an index.
49 """
50 pass
51
52 def get_slug(self):
53 """
54 Allows subclasses to implement their own slug creation logic.
55 """
56 return slugify(self.title)
Wednesday, June 19, 13
46. 1 # models.py
2
3 from django.db import models
4 from .base import Slugged
5
6
7 class School(Slugged):
8 pass
Wednesday, June 19, 13
47. 1 # models.py
2
3 from django.db import models
4 from .base import Slugged
5
6 class School(Slugged):
7
8 @models.permalink
9 def get_absolute_url(self):
10 return ('school_details', None, {'slug': self.slug})
Wednesday, June 19, 13
48. 1 class CrudUrl(models.Model):
2 class Meta:
3 abstract = True
4
5 def __init__(self, *args, **kwargs):
6 self._objname = self._meta.object_name.lower()
7 super(CrudUrl, self).__init__(*args, **kwargs)
8
9 @models.permalink
10 def get_absolute_url(self):
11 return ('%s_details' % self._objname, None, {'slug': self.slug})
12
13 @models.permalink
14 def get_list_url(self):
15 return ('%s_list' % self._objname, None, {})
16
17 @models.permalink
18 def get_create_url(self):
19 return ('%s_create' % self._objname, None, {})
20
21 @models.permalink
22 def get_update_url(self):
23 return ('%s_update' % self._objname, None, {'slug': self.slug})
24
25 @models.permalink
26 def get_delete_url(self):
27 return ('%s_delete' % self._objname, None, {'slug': self.slug})
28
Wednesday, June 19, 13
49. 1 class CrudUrl(models.Model):
2 class Meta:
3 abstract = True
4
5 def __init__(self, *args, **kwargs):
6 self._objname = self._meta.object_name.lower()
7 super(CrudUrl, self).__init__(*args, **kwargs)
8
9 @models.permalink
10 def get_absolute_url(self):
11 return ('%s_details' % self._objname, None, {'slug': self.slug})
12
13 @models.permalink
14 def get_list_url(self):
15 return ('%s_list' % self._objname, None, {})
16
17 @models.permalink
18 def get_create_url(self):
19 return ('%s_create' % self._objname, None, {})
20
21 @models.permalink
22 def get_update_url(self):
23 return ('%s_update' % self._objname, None, {'slug': self.slug})
24
25 @models.permalink
26 def get_delete_url(self):
27 return ('%s_delete' % self._objname, None, {'slug': self.slug})
28
Wednesday, June 19, 13
50. 1 # models.py
2
3 from django.db import models
4 from .base import Slugged, CrudUrl
5
6 class School(Slugged, CrudUrl):
7 pass
Wednesday, June 19, 13
52. 1 # urls.py
2
3 from django.conf.urls import patterns, include, url
4 from django.views.generic import (ListView, DetailView,
5 CreateView, UpdateView, DeleteView)
6 from .models import School
7
8
9 urlpatterns = patterns('',
10 url(r'^school/$',
11 ListView.as_view(),
12 name="school_list"),
13
14 url(r'^school/add/$',
15 CreateView.as_view(),
16 name="school_create"),
17
18 url(r'^school/update/(?P<slug>.*)/$',
19 UpdateView.as_view(),
20 name="school_update"),
21
22 url(r'^school/delete/(?P<slug>.*)/$',
23 DeleteView.as_view(),
24 name="school_delete"),
25
26 url(r'^school/(?P<slug>.*)/$',
27 DetailView.as_view(),
28 name="school_details"),
29 )
Wednesday, June 19, 13
54. 1 # views.py
2
3 from django.views.generic import (ListView, DetailView,
4 CreateView, UpdateView, DeleteView)
5 from .models import School
6
7
8 class SchoolListView(ListView):
9 '''
10 Template: school/school_list.html
11 '''
12 model = School
13
14 class SchoolDetailView(DetailView):
15 '''
16 Template: school/school_detail.html
17 '''
18 model = School
19
20 class SchoolCreateView(CreateView):
21 '''
22 Template: school/school_form.html
23 '''
24 model = School
25
26 class SchoolUpdateView(UpdateView):
27 '''
28 Template: school/school_form.html
29 '''
30 model = School
31
32 class SchoolDeleteView(DeleteView):
33 '''
34 Template: school/school_confirm_delete.html
35 '''
36 model = School
Wednesday, June 19, 13
55. 1 from django.views.generic.base import TemplateResponseMixin
2
3 class AjaxTemplateResponseMixin(TemplateResponseMixin):
4 def get_template_names(self):
5 """
6 Return a list of template names to be used for the request.
7 """
8 try:
9 names = super(AjaxTemplateResponseMixin, self).get_template_names()
10 except ImproperlyConfigured:
11 names = []
12
13 try:
14 opts = self.form_class._meta.model._meta
15 except:
16 try:
17 opts = self.object_list.model._meta
18 except:
19 try:
20 opts = self.object._meta
21 except:
22 opts = None
23
24 # Generates template name based on object name
24 if opts:
25 opts_list = (opts.app_label, opts.object_name.lower(), self.
26 template_name_suffix)
27
28 if self.request.is_ajax():
29 name = "%s/includes/%s%s.html" % opts_list
30
31 else:
32 name = "%s/%s%s.html" % opts_list
33
34 names.append(name)
35
36 return names
Wednesday, June 19, 13
56. 1 from django.views.generic.base import TemplateResponseMixin
2
3 class AjaxTemplateResponseMixin(TemplateResponseMixin):
4 def get_template_names(self):
5 """
6 Return a list of template names to be used for the request.
7 """
8 try:
9 names = super(AjaxTemplateResponseMixin, self).get_template_names()
10 except ImproperlyConfigured:
11 names = []
12
13 try:
14 opts = self.form_class._meta.model._meta
15 except:
16 try:
17 opts = self.object_list.model._meta
18 except:
19 try:
20 opts = self.object._meta
21 except:
22 opts = None
23
24 # Generates template name based on object name
24 if opts:
25 opts_list = (opts.app_label, opts.object_name.lower(), self.
26 template_name_suffix)
27
28 if self.request.is_ajax():
29 name = "%s/includes/%s%s.html" % opts_list
30
31 else:
32 name = "%s/%s%s.html" % opts_list
33
34 names.append(name)
35
36 return names
Wednesday, June 19, 13
57. 1 from django.views.generic.base import TemplateResponseMixin
2
3 class AjaxTemplateResponseMixin(TemplateResponseMixin):
4 def get_template_names(self):
5 """
6 Return a list of template names to be used for the request.
7 """
8 try:
9 names = super(AjaxTemplateResponseMixin, self).get_template_names()
10 except ImproperlyConfigured:
11 names = []
12
13 try:
14 opts = self.form_class._meta.model._meta
15 except:
16 try:
17 opts = self.object_list.model._meta
18 except:
19 try:
20 opts = self.object._meta
21 except:
22 opts = None
23
24 # Generates template name based on object name
24 if opts:
25 opts_list = (opts.app_label, opts.object_name.lower(), self.
26 template_name_suffix)
27
28 if self.request.is_ajax():
29 name = "%s/includes/%s%s.html" % opts_list
30
31 else:
32 name = "%s/%s%s.html" % opts_list
33
34 names.append(name)
35
36 return names
Wednesday, June 19, 13
58. 1 # views.py
2
3 from django.views.generic import (ListView, DetailView,
4 CreateView, UpdateView, DeleteView)
5 from .models import School
6 from .mixin import AjaxTemplateResponseMixin
7
8
9 class SchoolListView(ListView, AjaxTemplateResponseMixin):
10 '''
11 Template: school/school_list.html
12 AJAX Template: school/includes/school_list.html
13 '''
14 model = School
15
16 class SchoolDetailView(DetailView, AjaxTemplateResponseMixin):
17 '''
18 Template: school/school_detail.html
19 AJAX Template: school/includes/school_detail.html
20 '''
21 model = School
22
23 class SchoolCreateView(CreateView, AjaxTemplateResponseMixin):
24 '''
25 Template: school/school_form.html
26 AJAX Template: school/includes/school_form.html
27 '''
28 model = School
29
30 class SchoolUpdateView(UpdateView, AjaxTemplateResponseMixin):
31 '''
32 Template: school/school_form.html
33 AJAX Template: school/includes/school_form.html
34 '''
35 model = School
36
Wednesday, June 19, 13
59. 8 class FilterMixin(object):
9 allowed_filters = {}
10
11 def get_queryset_filters(self):
12 filters = {}
13
14 for item in self.request.GET:
15 allowed = self.allowed_filters.get(item)
16 if allowed:
17 keyname = "%s" % allowed
18 filter_values = self.request.GET.getlist(item)
19 filters[keyname] = filter_values
20 return filters
21
22 def get_queryset(self):
23 qs = super(FilterMixin, self).get_queryset()
24 return qs.filter(**self.get_queryset_filters())
Wednesday, June 19, 13
61. 8 class FilterMixin(object):
9 allowed_filters = {}
10
11 def get_queryset_filters(self):
12 filters = {}
13
14 for item in self.request.GET:
15 allowed = self.allowed_filters.get(item)
16 if allowed:
17 keyname = "%s" % allowed
18 filter_values = self.request.GET.getlist(item)
19 filters[keyname] = filter_values
20 return filters
21
22 def get_queryset(self):
23 qs = super(FilterMixin, self).get_queryset()
24 return qs.filter(**self.get_queryset_filters())
Wednesday, June 19, 13
62. 8 class FilterMixin(object):
9 allowed_filters = {}
10
11 def get_queryset_filters(self):
12 filters = {}
13
14 for item in self.request.GET:
15 allowed = self.allowed_filters.get(item)
16 if allowed:
17 keyname = "%s" % allowed
18 filter_values = self.request.GET.getlist(item)
19 filters[keyname] = filter_values
20 return filters
21
22 def get_queryset(self):
23 qs = super(FilterMixin, self).get_queryset()
24 return qs.filter(**self.get_queryset_filters())
Wednesday, June 19, 13
63. 1 # views.py
2
3 from django.views.generic import (ListView, DetailView,
4 CreateView, UpdateView, DeleteView)
5 from .models import School
6 from .mixin import AjaxTemplateResponseMixin, FilterMixin
7
8
9 class SchoolListView(ListView, FilterMixin,
AjaxTemplateResponseMixin):
10 '''
11 Template: school/school_list.html
12 AJAX Template: school/includes/school_list.html
13 '''
14 model = School
15 allowed_filters = {
16 'title': 'title__icontains',
17 'slug': 'slug__icontains',
18 }
19
Wednesday, June 19, 13
65. 1 # urls.py
2
3 from django.conf.urls import patterns, include, url
4 from .views import (SchoolListView, SchoolDetailView,
5 SchoolCreateView, SchoolUpdateView,
6 SchoolDeleteView)
7 from .models import School
8
9
10 urlpatterns = patterns('',
11 url(r'^school/$',
12 SchoolListView.as_view(),
13 name="school_list"),
14
15 url(r'^school/add/$',
16 SchoolCreateView.as_view(),
17 name="school_create"),
18
19 url(r'^school/update/(?P<slug>.*)/$',
20 SchoolUpdateView.as_view(),
21 name="school_update"),
22
23 url(r'^school/delete/(?P<slug>.*)/$',
24 SchoolDeleteView.as_view(),
25 name="school_delete"),
26
27 url(r'^school/(?P<slug>.*)/$',
28 SchoolDetailView.as_view(),
29 name="school_details"),
30 )
Wednesday, June 19, 13
68. 1. Row based permission ?
Django Guardian
(https://github.com/lukaszb/django-guardian)
Wednesday, June 19, 13
70. 2. Custom User Model ?
Pros
-You don’t need a user profile model
- Faster, as you don’t have to refer to profiles as foreign
keys.
- More flexibility
Wednesday, June 19, 13
71. 2. Custom User Model ?
Cons
- might break contrib.admin
- might break old apps
- might break stuffs tied to user (like permission) if
custom model is not implemented correctly.
Wednesday, June 19, 13
72. 2. Custom User Model ?
Conclusion
-Yes, if you’re just extending the user model. If you
inherit from AbstractUser, you should be fine.
- No, if you want to override existing fields or
functions. Unless you know what you’re doing, you
might end up breaking compatibility with other apps.
Wednesday, June 19, 13
73. 2. Custom User Model ?
Implementation
- Add to settings.py, AUTH_USER_MODEL = 'myuser.MyModel'.
Wednesday, June 19, 13
74. Thank You !
by Renyi Khor
renyi.ace@gmail.com
@renyikhor
https://github.com/renyi/django-tips-and-tricks
Wednesday, June 19, 13