Django的第一个web程序及深入学习

时间：2023-03-08 21:23:20

本学习历程参照Practical Django Projects和http://djangobook.py3k.cn上翻译的内容进行

注：本例以本机加以说明：

根据Django的安装过程可知：在命令行执行python django-admin.py startproject mysite 则在当前目录下自动创建了一个文件夹mysite，对于本机而言位于

D:\ProgramFile\python2.7.4\Scripts；在该文件夹下包含一个同名的mysite文件夹和manage.py文件，在二级mysite文件夹中包含有4个.py文件：

__init__.py   manage.py   settings.py   urls.py 

接下来在一级mysite文件夹下新建一个.py文件：views.py，其内容如下：
from django.http import HttpResponse

def hello(request):

    return HttpResponse("Hello world")

然后修改urls.py的内容，如下：

#from django.conf.urls import patterns, include, url

from django.conf.urls.defaults import *

from views import hello

# Uncomment the next two lines to enable the admin:

# from django.contrib import admin

# admin.autodiscover()

urlpatterns = patterns('',

    ('^hello/$', hello),

    # Examples:

    # url(r'^$', 'mysite.views.home', name='home'),

    # url(r'^mysite/', include('mysite.foo.urls')),

    # Uncomment the admin/doc line below to enable admin documentation:

    # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:

    # url(r'^admin/', include(admin.site.urls)),

)

注：上述代码中from views import hello，其中views.py放在了安装目录下，对于本机即为D:\ProgramFile\python2.7.4\views.py

原则就是保证程序执行后能够从系统路径中找到views.py从而import views，要注意！

然后cd到manage.py所在文件夹，在命令行执行python manage.py runserver,之后出现Django的第一个web程序及深入学习

则可以打开浏览器再在地址栏输入http://127.0.0.1:8000/hello/即可打开page显示出：Hello world，至此hello world的web程序成功！

Chapter 3：Customizing the Simple CMS

1.Adding Rich-Text Editing

选用TinyMCE：从官网http://tinymce.moxiecode.com/下载最新的稳定版本，此处我下载的是4.0.4版本

解压之后的路径\tinymce\js\tinymce，在tinymce目录中包含所有的TinyMCE code，对于本机实际路径为

D:\ProgramFile\python2.7.4\tinymce\js\tinymce（根据实际解压后的路径为准）然后打开工程下的urls.py file，将此路径添加进去，如下所示

 from django.conf.urls import patterns, include, url

 #from django.conf.urls.defaults import *

 #from views import hello

 # Uncomment the next two lines to enable the admin:

 from django.contrib import admin

 admin.autodiscover()

 from blog.views import *

 urlpatterns = patterns('',

 #    ('^hello/$', hello),

     # Examples:

     # url(r'^$', 'mysite.views.home', name='home'),

     # url(r'^mysite/', include('mysite.foo.urls')),

     # Uncomment the admin/doc line below to enable admin documentation:

     # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

     # Uncomment the next line to enable the admin:

      url(r'^admin/', include(admin.site.urls)),

      url(r'^blog/$', archive),

     (r'^tinymace/(?P<path>.*)$', 'django.views.static.serve',

                        { 'document_root': 'D:\ProgramFile\python2.7.4\tinymce\js\tinymce' }),

     (r'', include('django.contrib.flatpages.urls')),

 )

urls.py

接着就可以添加合适的JavaScript来调用template以增加和编辑flat pages

The admin application is not only designed to use its own templates as a fallback, but it also lets you provide your own if you’d like to customize it.

默认情况下，admin application将在以下几个地方寻找template：

(1).admin/flatpages/flatpage/change_form.html

(2).admin/flatpages/change_form.html

(3).admin/change_form.html

注：此处的实际路径就是在django目录下django\contrib\admin\templates\admin，与实际情况会有些出入，注意！

2.Right now I want to customize the interface for only one specific model.So inside my templates directory, create an admin subdirectory. Then create a flatpages subdirectory inside admin and a flatpage subdirectory inside flatpages. Finally, copy the change_form template from django/contrib/admin/tem-plates/admin/change_form.html in my copy of Django into the admin/flatpages/flatpage/ directory I just created.

对于本机即为：D:\ProgramFile\python2.7.4\Scripts\html\django-templates\admin\flatpages\flatpage

Then open up the change_form.html in my template directory and add it to add appropriate JavaScript for TinyMCE.

You wil see the following:  {{ media }}

Immediately below that, add the following:

<script type="text/javascript" src="/tinymce/tinymce.js"></script>

<script type="text/javascript">

tinyMCE.init({

    mode: "textareas",

    theme: "simple"

});

</script>

此处有很多问题需要解决：

首先在官网上有3中TinyMCE package可以下载：TinyMCE 4.0.4 ，TinyMCE 4.0.4 jQuery package，TinyMCE 4.0.4 development package

下载TinyMCE 4.0.4解压后目录为tinymce\js\tinymce里面包含一个tinymce.min.js文件

下载TinyMCE 4.0.4 development package解压后目录同样为tinymce\js\tinymce但里面包含很多js文件：tinymce.min.js，tinymce.js，tinymce.dev.js等，故根据上述change_form.html中添加内容应该是TinyMCE 4.0.4 development package

第二.在setting.py中

TEMPLATE_DIRS = (
'D:/ProgramFile/python2.7.4/Scripts/html/django-templates/admin/flatpages/flatpage',
# Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
# Always use forward slashes, even on Windows.
# Don't forget to use absolute paths, not relative paths.
)

所以要将路径中的反斜线\改为顺斜线/

第三.在urls.py中添加patterns：

(r'^tinymce/(?P<path>.*)$', 'django.views.static.serve',
{ 'document_root': 'D:\ProgramFile\python2.7.4\tinymce\js\tinymce' }),

在执行python manage.py runserver后打开浏览器输入http://127.0.0.1:8000/tinymce/提示报错将上述路径中\tinymce的\t当做了制表符，这个该如何解决，难道要改文件名吗？

第四. src="/tinymce/tinymce.js"中的路径要写完整的绝对路径吗？

反复试验始终未能解决？？？？？？

注意：我安装的是独立的django，网上还有一种django是打包有tinymce的：如 django-tinymce 1.5.1

问题解决啦：对于上述的第三个路径问题，为避免windows和linux系统路径格式的冲突问题，采用os.path来解决，具体见后面代码

1.首先在D盘创建一个文件夹DjangoProject，作为整个工程的目录，在命令行cd到该目录下，执行

python D:\ProgramFile\python2.7.4\Scripts\django-admin.py startproject cms

(注：此处可将D:\ProgramFile\python2.7.4\Scripts添加到环境变量path中，如此直接执行python django-admin.py startproject cms),于是便在DjangoProject中自动生成一个cms文件夹，其中包括一个同名cms文件夹和manage.py文件(注：此处与老版本django不同)，二级cms文件夹中包括4个文件，分别为：__init__.py    settings.py  urls.py  wsgi.py

2.然后将tiny_mce解压后的文件夹放到一级cms中：具体的directory为：D:\DjangoProject\cms\js\tiny_mce\tiny_mce.js

再copy the change_form template from django/contrib/admin/tem-plates/admin/change_form.html in your copy of Django into the admin/flatpages/flatpage/ directory you just created.具体为：D:\DjangoProject\templates\cms\admin\flatpages\flatpage\change_form.html

之后更改setting.py和urls.py的内容，详细代码如下：

 # Django settings for cms project.

 import os

 PROJECT_ROOT = os.path.abspath(os.path.dirname(__file__))

 DEBUG = True

 TEMPLATE_DEBUG = DEBUG

 ADMINS = (

     # ('Your Name', 'your_email@example.com'),

 )

 MANAGERS = ADMINS

 DATABASES = {

     'default': {

         'ENGINE': 'django.db.backends.sqlite3', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'.

         'NAME': os.path.join(PROJECT_ROOT, 'cms.db'),                      # Or path to database file if using sqlite3.

         'USER': '',                      # Not used with sqlite3.

         'PASSWORD': '',                  # Not used with sqlite3.

         'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.

         'PORT': '',                      # Set to empty string for default. Not used with sqlite3.

     }

 }

 # Hosts/domain names that are valid for this site; required if DEBUG is False

 # See https://docs.djangoproject.com/en/1.4/ref/settings/#allowed-hosts

 ALLOWED_HOSTS = []

 # Local time zone for this installation. Choices can be found here:

 # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name

 # although not all choices may be available on all operating systems.

 # In a Windows environment this must be set to your system time zone.

 TIME_ZONE = 'Asia/Shanghai PRC'

 # Language code for this installation. All choices can be found here:

 # http://www.i18nguy.com/unicode/language-identifiers.html

 LANGUAGE_CODE = 'zh-CN'

 SITE_ID = 1

 # If you set this to False, Django will make some optimizations so as not

 # to load the internationalization machinery.

 USE_I18N = True

 # If you set this to False, Django will not format dates, numbers and

 # calendars according to the current locale.

 USE_L10N = True

 # If you set this to False, Django will not use timezone-aware datetimes.

 USE_TZ = True

 # Absolute filesystem path to the directory that will hold user-uploaded files.

 # Example: "/home/media/media.lawrence.com/media/"

 MEDIA_ROOT = ''

 # URL that handles the media served from MEDIA_ROOT. Make sure to use a

 # trailing slash.

 # Examples: "http://media.lawrence.com/media/", "http://example.com/media/"

 MEDIA_URL = ''

 # Absolute path to the directory static files should be collected to.

 # Don't put anything in this directory yourself; store your static files

 # in apps' "static/" subdirectories and in STATICFILES_DIRS.

 # Example: "/home/media/media.lawrence.com/static/"

 STATIC_ROOT = ''

 # URL prefix for static files.

 # Example: "http://media.lawrence.com/static/"

 STATIC_URL = '/static/'

 # Additional locations of static files

 STATICFILES_DIRS = (

     # Put strings here, like "/home/html/static" or "C:/www/django/static".

     # Always use forward slashes, even on Windows.

     # Don't forget to use absolute paths, not relative paths.

 )

 # List of finder classes that know how to find static files in

 # various locations.

 STATICFILES_FINDERS = (

     'django.contrib.staticfiles.finders.FileSystemFinder',

     'django.contrib.staticfiles.finders.AppDirectoriesFinder',

 #    'django.contrib.staticfiles.finders.DefaultStorageFinder',

 )

 # Make this unique, and don't share it with anybody.

 SECRET_KEY = 'j7+nqq-%g=#lq2xm+$l^tpik-%r&amp;@*h@ws#*1cvw&amp;bs5=2vx$e'

 # List of callables that know how to import templates from various sources.

 TEMPLATE_LOADERS = (

     'django.template.loaders.filesystem.Loader',

     'django.template.loaders.app_directories.Loader',

 #     'django.template.loaders.eggs.Loader',

 )

 MIDDLEWARE_CLASSES = (

     'django.middleware.common.CommonMiddleware',

     'django.contrib.sessions.middleware.SessionMiddleware',

     'django.middleware.csrf.CsrfViewMiddleware',

     'django.contrib.auth.middleware.AuthenticationMiddleware',

     'django.contrib.messages.middleware.MessageMiddleware',

     # Uncomment the next line for simple clickjacking protection:

     # 'django.middleware.clickjacking.XFrameOptionsMiddleware',

 )

 ROOT_URLCONF = 'cms.urls'

 # Python dotted path to the WSGI application used by Django's runserver.

 WSGI_APPLICATION = 'cms.wsgi.application'

 TEMPLATE_DIRS = (

     # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".

     # Always use forward slashes, even on Windows.

     # Don't forget to use absolute paths, not relative paths.

     os.path.join(PROJECT_ROOT, '../../templates/cms/'),

 )

 INSTALLED_APPS = (

     'django.contrib.auth',

     'django.contrib.contenttypes',

     'django.contrib.sessions',

     'django.contrib.sites',

     'django.contrib.messages',

     'django.contrib.staticfiles',

     'django.contrib.admin',

     'django.contrib.flatpages',

     # Uncomment the next line to enable the admin:

     # 'django.contrib.admin',

     # Uncomment the next line to enable admin documentation:

     # 'django.contrib.admindocs',

 )

 # A sample logging configuration. The only tangible logging

 # performed by this configuration is to send an email to

 # the site admins on every HTTP 500 error when DEBUG=False.

 # See http://docs.djangoproject.com/en/dev/topics/logging for

 # more details on how to customize your logging configuration.

 LOGGING = {

     'version': 1,

     'disable_existing_loggers': False,

     'filters': {

         'require_debug_false': {

             '()': 'django.utils.log.RequireDebugFalse'

         }

     },

     'handlers': {

         'mail_admins': {

             'level': 'ERROR',

             'filters': ['require_debug_false'],

             'class': 'django.utils.log.AdminEmailHandler'

         }

     },

     'loggers': {

         'django.request': {

             'handlers': ['mail_admins'],

             'level': 'ERROR',

             'propagate': True,

         },

     }

 }

setting.py

 #from django.conf.urls import patterns, include, url

 from django.conf.urls.defaults import *

 import os

 ROOT_PATH = os.path.abspath(os.path.dirname(__file__))

 # Uncomment the next two lines to enable the admin:

 from django.contrib import admin

 admin.autodiscover()

 urlpatterns = patterns('',

     # Examples:

     # url(r'^$', 'cms.views.home', name='home'),

     # url(r'^cms/', include('cms.foo.urls')),

     # Uncomment the admin/doc line below to enable admin documentation:

     # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

     # Uncomment the next line to enable the admin:

     url(r'^admin/', include(admin.site.urls)),

     (r'^tiny_mce/(?P<path>.*)$', 'django.views.static.serve',

         { 'document_root': ROOT_PATH + '../js/tiny_mce/' }),

     (r'', include('django.contrib.flatpages.urls')),

 )

urls.py

注意2、4 line：采用os.path的格式书写绝对路径

urls.py中

(r'^tiny_mce/(?P<path>.*)$', 'django.views.static.serve',
{ 'document_root': ROOT_PATH + '../js/tiny_mce/' }),其中../代表上一级目录，../../代表上一级的上一级目录，/代表当前目录

至此，tinymce的问题解决，打开浏览器可以看到如下的效果：

Django的第一个web程序及深入学习

但是后来重新运行又没有编辑栏，貌似不稳定，不知是何情况？？？

接下来创建一个app：

Adding a  search  system to the  cms

打开命令行，cd到manage.py所在的目录：执行python manage.py startapp search

则在工程中自动生成search文件夹，文件夹中包括以下文件Django的第一个web程序及深入学习

接着打开视图函数view.py:

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