<Effective Django>读书笔记
- In Django parlance, a project is the final product, and it assembles one or more applications together.
- Manage.py is a pointer back to Django-admin.py with an environment variable set, pointing to your project as the one to read settings from and operate on when needed
- Settings.py is where you’ll configure your project. It has a few sensible defaults, but no database chosen when you start.
- Urls.py contains the URL to view mappings.
- Wsgi.py is a WSGI wrapper for your application.
- Beginning in Django 1.4, apps are placed alongside project packages.
- Models.py will contain the Django ORM models for your app.
- Views.py will contain the View code
- Tests.py will contain the unit and integration tests you write
- Django models map to a database table, and provide a place to encapsulate business logic. All models subclass the base Model
- The INSTALLED_APPS setting lists the applications that the project uses. These are listed as strings that map to Python packages. Django will import each and looks for a models there.
- By default Django will name your tables using a combination of the application name and model name.
- Django adds an id field as the primary key for your model, unless you specify a primary key.
- The syncdb manage command creates the tables in your database from models.
- The model Manager allows you to operate on the collection of instanes: querying, creating, etc
- Write unit tests for methods you add to the model
- The test manage command runs the unit tests.
- Django Views take an HTTP Request and return an HTTP Response to the user.
- Any Python callable can be a view. The only hard and fast requirement is that it takes the request object (customarily named request) as its first argument.
- Generic Views have always provided some basic functionality: render a template, redirect, create or edit a model.
- The URL configuration tells Django how to match a request’s path to your Python code. Django looks for the URL configuration, defined as urlpatterns, in the urls.py file in your project.
- By default Django will look for templates in applications, as well as in directories you specify in settings.TEMPLATE_DIRS.
- Most generic views that do form processing have the concept of the “success URL”: where to redirect the user when the form is successfully submitted.
- The collection of values available to a template when it’s rendered is referred to as the Context. The Context is a combination of information supplied by the view and information from context processors
- Django has two tools that are helpful for writing unit tests for views: the Test Client and the RequestFactory
- The TestClient takes a URL to retrieve, and resolves it against your project’s URL configuration. It then creates a test request, and passes that request through your view, returning the Response.
- Django supports adding static files at both the application and project level. Where you add them sort of depends on how tied to your specific assembly of apps they are.
- App specific static files are stored in the static subdirectory within the app. Django will also look in any directories listed in the STATIFFILES_DIRS setting.
- Django distinguishes between static site files, and user upload media.
- The staticfiles app is included to help manage static files and serve them during development.
- Static files can be included with apps, or with the project.
- Templates can extend one another, using block tags.
- A Django Form is responsible for taking some user input, validating it, and turning it into Python objects.
- Initial is a dictionary of values that will be used as the default values for an unbound form
- Forms have two different phases of validation: field and form. All the fields are validated and converted to Python objects (if possible) before form validation begins.
- Form validation takes place in a form’s clean() method
- Forms take user input, validate it, and convert it to Python objects.
- Django provides 3 types of fields for relating objects to each other: ForeignKey for creating one to many relationships, ManyToManyField for relating many to many, and OneToOneField for creating a one to one relationship.
- A FormSet is an object that manages multiple copies of the same Form(or ModelForm) in a single page.
<Effective Django>读书笔记的更多相关文章
- csapp读书笔记-并发编程
这是基础,理解不能有偏差 如果线程/进程的逻辑控制流在时间上重叠,那么就是并发的.我们可以将并发看成是一种os内核用来运行多个应用程序的实例,但是并发不仅在内核,在应用程序中的角色也很重要. 在应用级 ...
- CSAPP 读书笔记 - 2.31练习题
根据等式(2-14) 假如w = 4 数值范围在-8 ~ 7之间 2^w = 16 x = 5, y = 4的情况下面 x + y = 9 >=2 ^(w-1) 属于第一种情况 sum = x ...
- CSAPP读书笔记--第八章 异常控制流
第八章 异常控制流 2017-11-14 概述 控制转移序列叫做控制流.目前为止,我们学过两种改变控制流的方式: 1)跳转和分支: 2)调用和返回. 但是上面的方法只能控制程序本身,发生以下系统状态的 ...
- CSAPP 并发编程读书笔记
CSAPP 并发编程笔记 并发和并行 并发:Concurrency,只要时间上重叠就算并发,可以是单处理器交替处理 并行:Parallel,属于并发的一种特殊情况(真子集),多核/多 CPU 同时处理 ...
- 读书笔记汇总 - SQL必知必会(第4版)
本系列记录并分享学习SQL的过程,主要内容为SQL的基础概念及练习过程. 书目信息 中文名:<SQL必知必会(第4版)> 英文名:<Sams Teach Yourself SQL i ...
- 读书笔记--SQL必知必会18--视图
读书笔记--SQL必知必会18--视图 18.1 视图 视图是虚拟的表,只包含使用时动态检索数据的查询. 也就是说作为视图,它不包含任何列和数据,包含的是一个查询. 18.1.1 为什么使用视图 重用 ...
- 《C#本质论》读书笔记(18)多线程处理
.NET Framework 4.0 看(本质论第3版) .NET Framework 4.5 看(本质论第4版) .NET 4.0为多线程引入了两组新API:TPL(Task Parallel Li ...
- C#温故知新:《C#图解教程》读书笔记系列
一.此书到底何方神圣? 本书是广受赞誉C#图解教程的最新版本.作者在本书中创造了一种全新的可视化叙述方式,以图文并茂的形式.朴实简洁的文字,并辅之以大量表格和代码示例,全面.直观地阐述了C#语言的各种 ...
- C#刨根究底:《你必须知道的.NET》读书笔记系列
一.此书到底何方神圣? <你必须知道的.NET>来自于微软MVP—王涛(网名:AnyTao,博客园大牛之一,其博客地址为:http://anytao.cnblogs.com/)的最新技术心 ...
- Web高级征程:《大型网站技术架构》读书笔记系列
一.此书到底何方神圣? <大型网站技术架构:核心原理与案例分析>通过梳理大型网站技术发展历程,剖析大型网站技术架构模式,深入讲述大型互联网架构设计的核心原理,并通过一组典型网站技术架构设计 ...
随机推荐
- no OPENSSL_Applink错误的解决方法
原文链接: http://www.cnblogs.com/sdnyzhl/archive/2012/12/11/2813210.html 自己按照openssl中介绍的编译,安装openssl,其间编 ...
- 具体解释Hibernate中cascade与inverse
学习hibernate的时候对级联关系的概念老是分不清楚,尤其是cascade.inverse傻傻分不清.以下通过样例来简单说明. 准备工作: 首先创建数据库,新建两张表: 教室表classes (字 ...
- Android Camera开发:给摄像头预览界面加个ZoomBar(附完整代码下载)
源码:http://files.cnblogs.com/android100/StandardCamera2013-10-18.zip 废话不说了,就是加个seekbar,拖动的话能够调节焦距,让画面 ...
- MySQL数据库知识点整理 (持续更新中)
一.修改用户密码 格式(在命令行下输入):mysqladmin -u 用户名 -p旧密码 password 新密码 1. 给root添加密码ab12: mysqladmin -uroot -pass ...
- 如何获取 docker 容器(container)的 ip 地址(转)
1. 进入容器内部后 cat /etc/hosts 会显示自己以及(– link)软连接的容器IP 2.使用命令 docker inspect --format '{{ .NetworkSetting ...
- go包管理工具glide
一.命令 安装 $ go get github.com/Masterminds/glide $ go install github.com/Masterminds/glide 初始化项目并在当前项目下 ...
- IntelliJ IDEA设置代码括号对齐方式
IntelliJ IDEA设置代码括号对齐方式 IntelliJ IDEA默认的对齐方式如下:括号跟函数名在一行 想改为括号独自占一行,如下: 配置方式如下:File->Setting-> ...
- 解决ssh连接慢(有时候等半分钟才出现密码输入提示)的方法
经常通过ssh 或者 scp 连接一堆远程主机,同样是 Linux 主机,其中一些创建 ssh 连接速度特别慢,连接建立之后执行操作速度却很正常,看来应该不是网络原因.解决的方法是通过ssh 的-v参 ...
- python 搭建ftp服务器
代码示例: # coding: utf-8 import os from pyftpdlib.authorizers import DummyAuthorizer from pyftpdlib.han ...
- 解决git pull时出现的几个问题
第1个问题: 解决GIT代码仓库不同步 今天在执行git pull时出现: 解决方法:执行git checkout -f,然后再执行git pull重新checkout 再执行git pull时就可以 ...