Django开发的一些技术点(类视图,django-taggit,markdownx)

Django

一. 类视图(CBV):

https://www.cnblogs.com/chichung/p/9886655.html

https://blog.csdn.net/AI_GG/article/details/103696360

https://www.cnblogs.com/knighterrant/p/10503645.html

https://blog.csdn.net/xujin0/article/details/84038778

https://blog.csdn.net/xujin0/article/details/84038778

https://www.runoob.com/django/django-form-component.html

1. 后端逻辑处理时不通过逻辑来判断请求方式是get还是post请求,在视图类中,定义了get方法就是写get请求的逻辑,定义类post方法时就是post请求逻辑

2. View大致的执行流程

   self.as_view() ----->self.dispatch() ------> self.get/post

   路由分发开始 获取具体的请求方面名,在通过反射具体的请求函数 视图函数

   class View:
   	http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace']
   
   	def as_view(cls, **initkwargs):
   
   		def view(request, *args, **kwargs):
   
   			return self.dispatch(request, *args, **kwargs)
   		return view
   
   	def dispatch(self, request, *args, **kwargs):
   		if request.method.lower() in self.http_method_names:
   			#用反射获取函数
   			handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
   		else:
   			handler = self.http_method_not_allowed
   
   		return handler(request, *args, **kwargs)
   
   

   from django.view import View
   
   class LoginView(View):
   	def get(self, request, *args, **kwargs):
   		return render(request, 'login.html')
   
   
   	def post(self, request, *args, **kwargs):
   		return redirect('/index/')
   

   类视图的好处:

   代码可读性好

   类视图相对于函数有更高的复用性,一个类视图实现一块功能,如果其他地方需要某个类视图的某个特定的额逻辑,直接继承这个类视图就可以了

二. 其它问题

action 问题: https://blog.csdn.net/qq_34045989/article/details/88977104

上传图片: https://blog.csdn.net/meylovezn/article/details/47124923

MEDIA_ROOT: https://segmentfault.com/a/1190000021960355

​ https://www.cnblogs.com/icat-510/p/9034727.html

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django-taggit: https://cloud.tencent.com/developer/article/1635695

In [4]: from articles.models import TestImage

In [5]: ti  =TestImage.objects.create(name='yyt', img='img/test.png')

In [6]: ti.tags.add('new','sad','angry')

In [7]: ti.tags.all()
Out[7]: <QuerySet [<Tag: angry>, <Tag: new>, <Tag: sad>]>

In [8]: TestImage.objects.filter(tags__name__in=['new'])
Out[8]: <QuerySet [<TestImage: TestImage object (13)>]>

django-taggit文档: https://django-taggit.readthedocs.io/en/latest/api.html

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django-markdown实现: https://blog.csdn.net/Empire_03/article/details/87112250

使用markdown:https://blog.csdn.net/qq_34405401/article/details/102528305

​ http://www.zhidaow.com/post/djaog-1-6-markdown

pip install markdown

将markdown嵌入到django中的基本思路是:随便在一个页面中定义一个框书写markdown语法,然后写完后将markdown语法经过处理变成html语句传到页面中执行就可以,总体来说就是为模板渲染加入markdwon支持

django-markdown-deux:https://github.com/trentm/django-markdown-deux

ERRORS: ?: (staticfiles.E002) The STATICFILES_DIRS setting should not contain the STATIC_ROOT settin

https://blog.csdn.net/Sun_White_Boy/article/details/80684620

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urls.py里面写路由的格式

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django form表单提交action的url怎么写?

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在forms里面怎么定义textfield类型的数据,写成forms.CharField(widget=forms.Textarea)

class BlogForm(forms.Form):
		title  = forms.CharField(required = True) 
		content = forms.CharField(widget=forms.Textarea)