Curso de Django | Django Course

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Temario

Vistas ,[object Object],[object Object],[object Object],[object Object]

# en urls.py (r'^example/project/(?P<project_id>+)/$', 'example_get_project') # en views.py def example_get_project (request, project_id): try: p = Project.objects.get(project__pk=project_id) # pk synonym of id html = ( "<html> <body>" " Project Name: %s " " Project Description: %s " "</body> </html>" ) % (p.name, p.description) except Project.DoesNotExist: html = "<html> <body> Bu! :-( No existe! </body> <html>" return HttpResponse(html) Vistas

from django.http import HttpResponse, HttpResponseNotFound def example_get_project (request, project_id): try : p = Project.objects.get(project__pk=project_id) # pk synonym of id html = ( "<html> <body>" " Project Name: %s " " Project Description: %s " "</body> </html>" ) % (p.name, p.description) return HttpResponse(html) except Project.DoesNotExist: html = "<html> <body> " "Bu! :-( No existe!" " </body> <html>" return HttpResponseNotFound(html ) Vistas

from django.http import HttpResponse, Http404 def example_get_project (request, project_id): try : p = Project.objects.get(project__pk=project_id) # pk synonym of id html = ( "<html> <body>" " Project Name: %s " " Project Description: %s " "</body> </html>" ) % (p.name, p.description) return HttpResponse(html) except Project.DoesNotExist: raise Http404 ,[object Object],Vistas

def example_get_project_with_template (request, project_id): try : p = Project.objects.get(pk=project_id) t = loader.get_template('project_details.html') c = Context({'project': p}) r = HttpResponse(t.render(c), mimetype="application/xhtml+xml") return r except Project.DoesNotExist: raise Http404 def example_get_project_with_get_object (request, project_id) p = get_object_or_404(Project, pk=project_id) return render_to_response('project_details', { 'project' : p }) ,[object Object],[object Object],Vistas

[object Object],Vistas ,[object Object],In [1]: from django.http import HttpResponse In [2]: response = HttpResponse() In [3]: response.write("Here's the text of the Web page.") ,[object Object],In [5]: response['X-DJANGO'] = 'It is the best' In [6]: response['X-DJANGO'] Out[6]: 'It is the best' ,[object Object]

import csv, StringIO def _gen(qset): io = StringIO.StringIO() writer = csv.writer(io) writer.writerow(TaskLog.header_row) # Add header yield io.getvalue() for item in qset: io = StringIO.StringIO() writer = csv.writer(io) writer.writerow(item.get_csv_row()) yield io.getvalue() return def csv_log(request, project_id, username): ... response = HttpResponse(_gen(queryset), mimetype='text/csv') response[ 'Content-Disposition' ] = ( 'attachment; filename=' 'tasklogs' '-for-%s.csv' ) % username return response

Atributos HttpResponse.content Métodos HttpResponse.__init__(content='', mimetype=None, status=200, content_type=DEFAULT_CONTENT_TYPE) HttpResponse.__setitem__(header, value) HttpResponse.__delitem__(header) HttpResponse.__getitem__(header) HttpResponse.has_header(header) HttpResponse.set_cookie(key, value='', max_age=None, expires=None, path='/', domain=None, secure=None) HttpResponse.delete_cookie(key, path='/', domain=None) HttpResponse.write(content) HttpResponse.flush() HttpResponse.tell()

class HttpResponseRedirect class HttpResponsePermanentRedirect class HttpResponseNotModified class HttpResponseBadRequest class HttpResponseNotFound class HttpResponseForbidden class HttpResponseNotAllowed class HttpResponseGone class HttpResponseServerError

Plantillas ,[object Object],[object Object],[object Object],[object Object],[object Object]

In [1]: from django.template import Template # Parsear código de Templates y generar una instancia In [4]: t = Template("Hello, {{ name }}") In [6]: print t <django.template.Template object at 0x87c7aec> In [8]: from django.template import Context # Una vez compilada podemos renderizar con un contexto In [9]: c = Context({'name' : 'World'}) In [10]: t.render(c) Out[10]: u'Hello, World' Plantillas

{% extends "base_for_examples.html" %} {% block title %} Un proyecto: {{ project.name }} {% endblock title %} {% block content %} Un proyecto: <hr/> Nombre: {{ project.name|upper }} Descripción: {{ project.description|truncatewords:"10" }} {% endblock content %} Variable, el punto (.) se accede a los atributos de la variable, diccionario, llamada a una función sin arg. Etiqueta que define un bloque que se puede sobre escribir. Herencia. Filtro, módifica el string, letras mayúsculas Indica de que template hereda Plantillas TEMPLATE_STRING_IF_INVALID

In [1]: from django.template import Template, Context In [12]: b = { 'apellido' :'Perez', 'ocupacion' : 'astronauta' } In [13]: t = Template('Yo me llamo {{ dict.apellido }} y soy {{ dict.ocupacion }}') In [14]: c = Context({'dict' : b}) In [15]: t.render(c) Out[15]: u'Yo me llamo Perez y soy astronauta' In [16]: t = Template('Yo me llamo {{ dict.apellido|upper }} y soy {{ dict.ocupacion }}') In [17]: t.render(c) Out[17]: u'Yo me llamo PEREZ y soy astronauta' ,[object Object],Plantillas

Plantillas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

{% if project_list %} {% for project in project_list %} <li> <a class="head" href='#'>{{project.name}}</a> <ul> {% for task in project.task_set.all %} <li> <a href="#" onclick="retrieve_tasklogs({{ task.id }})"> {{ task.name }} </a> </li> {% endfor %} </ul> </li> {% endfor %} {% else %} <li> <a class="head" href='#'> No projects in database </a> Please add some projects in the database </li> {% endif %} Plantillas

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Plantillas

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> {% block title %} Titulo {% endblock title %} </head> <body> {% block content %} Aquí el contenido de la página {% endblock content %} </body> </html> Plantillas ,[object Object]

{% extends "base_for_examples.html" %} {% block title %} Un proyecto: {{ project.name }} {% endblock title %} {% block content %} {% block.super %} Un proyecto: <hr/> Nombre: {{ project.name|upper }} Descripción: {{ project.description|truncatewords:"10" }} {% endblock content %} Plantillas

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title> Un proyecto: Curso Django </title> </head> <body> Pagina de la Aplicación: TimeTracker Un proyecto: <hr/> Nombre: CURSO DJANGO Descripción: curso, curso, curse! </body> </html> Plantillas ,[object Object]

Plantillas ,[object Object],In [23]: c = Context() In [24]: c['foo'] = 'first level' In [25]: c.push() Out[25]: {} In [26]: c['foo'] = 'second level' In [27]: c['foo'] Out[27]: 'second level' In [28]: c Out[28]: [{'foo': 'second level'}, {'foo': 'first level'}] In [29]: c.pop() Out[29]: {'foo': 'second level'} In [30]: c['foo'] Out[30]: 'first level' In [31]: c.pop() ----------------------------------------------------- <class 'django.template.context.ContextPopException'>

Plantillas ,[object Object],[object Object],[object Object],[object Object],def ip_address_processor(request): return {'ip_address': request.META['REMOTE_ADDR']} def some_view(request): # ... c = RequestContext(request, {'foo': 'bar',}, [ip_address_processor]) return t.render(c)

Plantillas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plantillas TEMPLATE_CONTEXT_PROCESSORS = ( "django.core.context_processors.auth", "django.core.context_processors.debug", "django.core.context_processors.i18n", "django.core.context_processors.media", "timetracker.views.add_next_url", ) # --- request preprocessor / en views def add_next_url (request): return { 'next_url' : request.GET.get('next', None) } ,[object Object]

def some_view(request): # ... return render_to_response( 'my_template.html', my_data_dictionary, context_instance=RequestContext(request) ) Plantillas ,[object Object]

Managers ,[object Object],In [1]: from timetracker.models import Project In [2]: Project.objects.all() Out[2]: [<Project: Curso Django>, <Project: Eff>] In [5]: Project.objects.filter(name='Curso Django') Out[5]: [<Project: Curso Django>]

Managers ,[object Object],from django.db import models class TimeTrackerBaseModel (models.Model): ... class Task (TimeTrackerBaseModel): ... tasks = models.Manager() In [7]: from timetracker.models import Task In [8]: Task.objects.all() ... <type 'exceptions.AttributeError'>: type object 'Task' has no attribute 'objects' In [9]: Task.tasks.all() Out[9]: [<Task: edit templates, test and fix views>, <Task: crear algunas vistas>]

Managers ,[object Object],[object Object],[object Object],[object Object]

Managers ,[object Object],class TaskManager (models.Manager): def admin_task_count( self ): from django.db import connection cursor = connection.cursor() cursor.execute( """ SELECT COUNT(*) FROM timetracker_task WHERE timetracker_task.owner_id = 1; """ ) return cursor.fetchall()[0][0] def query_admin_task_count( self ): return self .filter(owner__username='admin').count() class Task (TimeTrackerBaseModel): ... tasks = TaskManager()

Managers ,[object Object],In [2]: from timetracker.models import Task In [3]: Task.tasks.all() Out[3]: [<Task: edit templates, test and fix views>, <Task: crear algunas vistas>] In [4]: Task.tasks.admin_task_count() Out[4]: 2 In [5]: Task.tasks.query_admin_task_count() Out[5]: 2

Managers class UncompletedTaskManager (models.Manager): def get_query_set(self): return super (UncompletedTaskManager, self ).get_query_set().exclude(state=30) class CompletedTaskManager (models.Manager): def get_query_set(self): return super (CompletedTaskManager, self ).get_query_set().filter(state=30) # Importante el primer Manager que Django encuentra es el # default class Task (TimeTrackerBaseModel): ... tasks = TaskManager() uncompleted_tasks = UncompletedTaskManager() completed_tasks = CompletedTaskManager() ,[object Object]

Managers In [1]: from timetracker.models import Task In [2]: Task.uncompleted_tasks.all() Out[2]: [<Task: crear algunas vistas>] In [3]: Task.completed_tasks.all() Out[3]: [<Task: edit templates, test and fix views>] In [4]: Task.tasks.all() Out[4]: [<Task: edit templates, test and fix views>, <Task: crear algunas vistas>] ,[object Object],[object Object]

Un poco de AJAX y un poco de Serialización

AJAX ,[object Object],[object Object],[object Object],[object Object]

AJAX ,[object Object],{% block script %} function get_project_tasks(url) { $.ajax({ type: "GET", url: url, dataType: "html", success: function(html){ $("#id_tasks_set").empty().append(html); } }); } {% endblock script %}  <script type="text/javascript" src="/timetracker/resources/js/jquery.js"> </script>

AJAX def example_ajax_get_task_for_project (request, project_id): if request.method == 'GET': p = get_object_or_404(Project, pk=project_id) tasks = p.task_set.all() if request.is_ajax(): # HTTP_X_REQUESTED_WITH # with string 'XMLHttpRequest' return render_to_response('task_details_ajax.html', { 'tasks' : tasks }) else: return render_to_response('project_with_tasks_details.html', { 'project' : p, 'tasks' : tasks })  <ul> {% for task in tasks %} <li> Nombre: {{ task.name }} </li> <li> Descripción: {{ task.description }} </li> <li> Fecha de Inicio: {{ task.start_date }} </li>  {% endfor %} <ul>

Serialización In [11]: from django.core import serializers In [12]: data=serializers.serialize("xml",Project.objects.filter(pk=1), fields=('name',)) In [17]: data Out[17]: '<?xml version="1.0" encoding="utf-8"?><django-objects version="1.0"><object pk="1" model="timetracker.project"><field type="CharField" name="name">Curso Django</field></object></django-objects> In [18]: for obj in serializers.deserialize("xml", data): ....: print obj, type(obj) ....: ....: <DeserializedObject: Curso Django> <class 'django.core.serializers.base.DeserializedObject'>

Serialización ,[object Object],[object Object],[object Object],out = open("file.xml", "w") xml_serializer.serialize(SomeModel.objects.all(), stream=out) XMLSerializer = serializers.get_serializer("xml") xml_serializer = XMLSerializer() xml_serializer.serialize(queryset) data = xml_serializer.getvalue() for deserialized_object in serializers.deserialize("xml", data): if object_should_be_saved(deserialized_object): deserialized_object.save()

AJAX y Serialización ,[object Object],json_serializer = serializers.get_serializer("json")() json_serializer.serialize(queryset, ensure_ascii=False, stream=response)

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