![ORM (2) - model
class User( models.Model ):
name = models.CharField(maxlength=100,
unique=True)
email = models.EmailField(blank=True)
photo = models.ImageField(
upload_to='img', blank=True)
created = models.DateTimeField(
default=datetime.now)
group = models.ForeignKey(Group,
blank=True, null=True)
class Meta:
ordering = ['name', '-email']
verbose_name = 'User of our system'](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-10-320.jpg)
![ORM (4) - queryset
>>> qset = User.objects.all()
>>> qset = qset.filter( name__contains='vom')
>>> qset = qset.filter( group__isnull=False,
group__created__gt=now() )
>>> qset = qset.order_by( 'created' )
>>> qset.get( pk=1 )
<User: 1>
>>> qset = qset.exclude( name='vokurka' )
>>> qset[:5]
[<User: 1>]
>>> qset.values('email')
[{'email' : 'vomacka@centrum.cz'}]](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-12-320.jpg)
![Templates (2)
Zalo転en箪 na ddinosti (include lze tak辿)
Vyu転鱈v叩 promnn辿 ({{ ... }}) a tagy ({% %})
{{ prom.x }} vyzkou邸鱈 prom.x, prom.x() a
prom[x]
Promnn辿 lze pelo転it pomoc鱈 filtr哲
{{ user.created|date:"F Y" }}
Soubory se hledaj鱈 dle konfigurace, nap鱈klad:
v adres叩i templates/ v projektu a aplikac鱈ch
v datab叩zi
pes HTTP z jin辿ho serveru](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-14-320.jpg)
![Forms (1)
Deklarativn鱈 popis formul叩e
Postar叩 se o validaci a vyi邸tn鱈 dat
Mo転nost vygenerovat formul叩 pro Model
class MyForm( forms.Form ):
email = forms.EmailField( required=False )
choice = forms.ChoiceField(
choices=[(1,'one'), (2,'two')] )](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-15-320.jpg)
![Forms (2)
Template (easy verze)
<form action="." method="POST">
<table>{{ form.as_table }}</table>
<input type="submit" />
</form>
View
def my_view( request ):
if request.method == 'POST':
form = MyForm( request.POST )
else: form = MyForm()
if form.is_valid():
form.cleaned_data['email']
return HttpResponseRedirect('/')
return render_to_response('template.html',
{'form' : form})](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-16-320.jpg)
![Models
from google.appengine.ext import db
from google.appengine.api import users
class Employee(db.Model):
name = db.StringProperty(required=True)
role = db.StringProperty(required=True,
choices=set(["executive", "manager",]))
hire_date = db.DateProperty()
account = db.UserProperty()
e = Employee(
name="",
role="manager",
account=users.get_current_user())
e.put()](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-32-320.jpg)
![GQL
from google.appengine.api import users
training_registration_list = [
users.User("Alfred.Smith@example.com"),
users.User("jharrison@example.com"),
users.User("budnelson@example.com")]
employees = db.GqlQuery("""
SELECT *
FROM Employee
WHERE account IN :1
""",
training_registration_list)
for e in employees: ...](https://image.slidesharecdn.com/django-100521111536-phpapp02/85/Django-33-320.jpg)
Django
- 1. The Web framework for perfectionists with deadlines.
- 2. Filosofie Loose coupling Quick Development Don't Repet Yourself (DRY) Batteries included :)
- 3. Sou叩sti URL resolver ORM Forms Templates Test framework Contrib aplikace auth, admin, sessions, formtools Reusable aplikace, Pinax
- 4. Terminologie Model objekt v DB (User, Article) View k坦d obstar叩vaj鱈c鱈 logiku (list_users(), add_article()) Template 邸ablona presentace (user_list.html) Projekt skupina aplikac鱈, definuje DB a spol. (portal, blog), reprezentuje jeden web Aplikace skupina model哲 a pidru転en箪ch objekt哲, m哲転e 転鱈t mimo projekt ( comments, galleries,articles)
- 5. Core Z叩klad syst辿mu se star叩 o: Interakci s web serverem mod_python, FastCGI, WSGI Zabalen鱈 HTTP po転adavku/odpovdi H叩ky pro uchycen鱈 vlastn鱈ho k坦du signals ud叩losti, na kter辿 se d叩 nav叩zat middleware umo転uje vsunout k坦d do r哲zn箪ch 叩st鱈 cyklu
- 6. Views Libovoln叩 funkce pij鱈maj鱈c鱈 HttpRequest a vracej鱈c鱈 HttpResponse def hello_world( request ): return HttpResponse( "Hello world!" ) def working( request, id ) return HttpResponse( str(get_object_or_404(Author, pk=id)) )
- 7. URL Resolver (1) Pekl叩d叩 URL do vol叩n鱈 view Mapov叩n鱈 pomoc鱈 regul叩rn鱈ch v箪raz哲 skupiny v reg. v箪razech obsahuj鱈 parametry funkce urlpatterns = patterns('user_app', url(/slideshow/django-4204103/4204103/r& ), url(/slideshow/django-4204103/4204103/r&)/$','detail', {'t':'u.html'}), url(/slideshow/django-4204103/4204103/r&)), )
- 8. URL Resolver (2) Parametry v URL umo転uj鱈 pkn辿 adresy /mail/vokurka/inbox/page3/ Parametry v urlpatterns pom叩haj鱈 u obecn箪ch funkc鱈 include() pom叩h叩 s modularizac鱈 Lze mapovat i zptn (view -> URL)
- 9. ORM (1) PostgreSQL, MySQL, SQLite, Oracle ... Umo転uje deklarativn鱈 definici model哲 Podporuje ddinost (ist) Django samo vytvo鱈 DB sch辿ma Lazy evaluace dotaz哲
- 10. ORM (2) - model class User( models.Model ): name = models.CharField(maxlength=100, unique=True) email = models.EmailField(blank=True) photo = models.ImageField( upload_to='img', blank=True) created = models.DateTimeField( default=datetime.now) group = models.ForeignKey(Group, blank=True, null=True) class Meta: ordering = ['name', '-email'] verbose_name = 'User of our system'
- 11. ORM (3) - basic >>> user = User( name='vomacka' ) >>> user.save() >>> user.id 1 >>> user.created.year, user.created.month (2007, 2)
- 12. ORM (4) - queryset >>> qset = User.objects.all() >>> qset = qset.filter( name__contains='vom') >>> qset = qset.filter( group__isnull=False, group__created__gt=now() ) >>> qset = qset.order_by( 'created' ) >>> qset.get( pk=1 ) <User: 1> >>> qset = qset.exclude( name='vokurka' ) >>> qset[:5] [<User: 1>] >>> qset.values('email') [{'email' : 'vomacka@centrum.cz'}]
- 13. Templates (1) Jednoduch箪 znakovac鱈 jazyk: {% extends "base.html" %} {% block main %} {% if user %} {{ user.name }}, today is {% now "l" %}. {% else %} Stranger, this month is {% now "F" %} {% endif %} {% for obj in object_list %} {{ object|escape|urlize }}<br /> {% endfor%} {% endblock %}
- 14. Templates (2) Zalo転en箪 na ddinosti (include lze tak辿) Vyu転鱈v叩 promnn辿 ({{ ... }}) a tagy ({% %}) {{ prom.x }} vyzkou邸鱈 prom.x, prom.x() a prom[x] Promnn辿 lze pelo転it pomoc鱈 filtr哲 {{ user.created|date:"F Y" }} Soubory se hledaj鱈 dle konfigurace, nap鱈klad: v adres叩i templates/ v projektu a aplikac鱈ch v datab叩zi pes HTTP z jin辿ho serveru
- 15. Forms (1) Deklarativn鱈 popis formul叩e Postar叩 se o validaci a vyi邸tn鱈 dat Mo転nost vygenerovat formul叩 pro Model class MyForm( forms.Form ): email = forms.EmailField( required=False ) choice = forms.ChoiceField( choices=[(1,'one'), (2,'two')] )
- 16. Forms (2) Template (easy verze) <form action="." method="POST"> <table>{{ form.as_table }}</table> <input type="submit" /> </form> View def my_view( request ): if request.method == 'POST': form = MyForm( request.POST ) else: form = MyForm() if form.is_valid(): form.cleaned_data['email'] return HttpResponseRedirect('/') return render_to_response('template.html', {'form' : form})
- 17. Dal邸鱈 sou叩sti Sessions Auth Generic Views Admin Syndication GeoDjango Comments ...
- 18. Generic Views (1) Nkter辿 jednoduch辿 vci se dlaj鱈 st叩le dokola: Pid叩n鱈/炭prava/odstrann鱈 objektu V箪pis seznamu/podrobnost鱈 Archiv Django pro n nab鱈z鱈 hotov辿 view, kter箪m sta鱈 nastavit parametry
- 19. Generic Views (2) urls.py: (r'list/$', 'object_list', {'queryset' : qset, 'paginate_by' : 20} ), (r'(?P<object_id>d+)/$'), 'object_detail', {'queryset' : qset} ), (r'add/$', 'create_object', {'model' : Model, 'template_name' : 'model_form.html'} ), (r'(?P<object_id>d+)/edit/$'), 'update_object', {'model' : Model} ), (r'(?P<object_id>d+)/delete/$'), 'delete_object', {'model' : Model} ),
- 20. Sessions P鱈davn叩 aplikace staraj鱈c鱈 se o zpr叩vu session promnn箪ch Ve view viditeln辿 jako request.session Implementov叩no nkolik backend哲 ( cache, db, ...), do request se dostane pes middleware Umo転uje ukl叩d叩n鱈 libovoln辿ho obsahu (autoatick叩 serializace)
- 21. Auth Star叩 se o autentifikaci a autorizaci u転ivatel哲 Mo転no pou転鱈t libovoln箪 backend Automaticky vytvo鱈 ADD/UPDATE a DELETE pr叩va k model哲m Sou叩st鱈 je middleware, kter箪 udr転uje user v request.user (pou転鱈v叩 sessions) >>> user.is_authenticated() True >>> user.has_perm('some_perm') True >>> user.password u'sha1$9bb2c$154ecb89654d90a50869c9f115...'
- 22. Admin (1) Pou転鱈v叩 auth pro spr叩vu u転ivatel哲 a pr叩v U転ivatel mus鱈 m鱈t is_staff Modely, na kter辿 nem叩 pr叩vo ani nevid鱈 Umo転uje jednoduch辿 manipulace s objekty CREATE/UPDATE/DELETE Poskytuje i z叩kladn鱈 dokumentaci k projektu
- 23. Admin (2) class Author( models.Model ): name = class AuthorOptions(admin.ModelAdmin): list_display = ('name', 'surname', 'created' ) list_filter = ('created', 'site' ) search_fields = ('name','surname','site__title') fields = ( (None, {'fields':(('name','surname'), 'email'}), ) admin.site.register(Author, AuthorOptions)
- 24. GeoDjango Podpora pro pr叩ci s geografick箪mi daty MySQL, Postgres, SQLite, Oracle Spatial queries Map widget
- 25. Reusable Aplikace Znovupou転iteln辿 aplikace pro ka転d箪 den: Celery (task queues) Haystack (fulltext s ruzn箪mi backendy) Taggit (tagging) Mailer Pinax
- 26. Zdroje http://www.djangobook.com/ http://code.djangoproject.com/ http://docs.djangoproject.com/ Mailing listy django-users, django-cs a django-developers @googlegroups.com IRC: #django on freenode.net
- 27. ?
- 29. App hosting U転ivatel v哲bec nevid鱈 HW Nahraje jen aplikaci a pou転鱈v叩 slu転by Aplikace v Pythonu nebo Jav (JVM) Plat鱈 se za spotebovan辿 prostedky: Bandwidth CPU time Storage API calls
- 30. Slu転by Static files URL Fetch Data Store Google accounts memcached Cron jobs Mail Tasks XMPP Blobstore Images
- 31. Data store NOSQL datab叩ze (GQL) Definice model哲, entit, podobn jako v Djangu Omezen辿 mo転nosti dotaz哲
- 32. Models from google.appengine.ext import db from google.appengine.api import users class Employee(db.Model): name = db.StringProperty(required=True) role = db.StringProperty(required=True, choices=set(["executive", "manager",])) hire_date = db.DateProperty() account = db.UserProperty() e = Employee( name="", role="manager", account=users.get_current_user()) e.put()
- 33. GQL from google.appengine.api import users training_registration_list = [ users.User("Alfred.Smith@example.com"), users.User("jharrison@example.com"), users.User("budnelson@example.com")] employees = db.GqlQuery(""" SELECT * FROM Employee WHERE account IN :1 """, training_registration_list) for e in employees: ...
- 34. Queries q = Person.all() q.filter("last_name =", "Smith") q.filter("height <", 72) q.order("-height") q = db.GqlQuery(""" SELECT * FROM Person WHERE last_name = :1 AND height < :2 ORDER BY height DESC """, "Smith", 72)
- 35. Django on GAE GAE m叩 built-in django 0.96, 1.0 a 1.1 ist辿 django, tedy bez modelu, auth a admin djangoappengine (django-nonrel) Funkn鱈 admin Django NOSQL GSOC
- 36. ?
- 37. Dkuji za pozornost E-mail: honza.kral@gmail.com Twitter: @honzakral