Django personal blog building --9-- search articles by title

Preface ：

You can see , My navigation bar has a search box

This search box can be used to search for articles by title and display the article details page , When we enter an article title that is in the database , After clicking search, you can jump to the article details page . Without this article , Just jump back to the home page , And display in the box find_nothing The font of ,OK Don't talk much , Open the door ！

Functional analysis ：

obviously , This function is not difficult to implement , With the foundation of the previous registration and login , Actually, this function can't be checked very much , The data in the input box is marked with post To the background , And then go backstage filter Method to go to the object list , Then display on the details page
As for the Input box placeholder Show find_nothing, This is because redirection is required , Redirection can't be like render In that way, we can pass values by dictionary , There are two ways to do it online ：

1. Store the data to be transferred to the front end in the cache
2. The data to be transmitted to the front end is get The way to do this is to url On

The method of caching is very convenient , and url clean , Nothing else , But it is a cache data after all , Just like login information , He will keep it for a while , When you don't need to search things for a while , And run to other pages , that find_nothing It will still be displayed on the input box , This is obviously not what we want , What we need is to jump out the word when we can't find it , And has no effect on other pages
therefore , I decided get Method pass value

Code implementation ：

def sousuo(request):
try:
sou = request.POST.get('sousuo')
if request.method == 'POST':
article = Article.objects.filter(title=sou)
if article.exists():
detail_info = article[0]
else:
return redirect('/?error=find_nothing')
denglu = request.session.get('name', ' tourists ')
return render(request, 'blogmuban/xiangqing.html', {
'detail_info':detail_info,'denglu':denglu})
except Exception as e:
print(e)

Such as code ： I use filter Method to retrieve the data whose title contains the contents of the search box , Whether there is this data or not ,filter Methods are stored in article, Then we can judge whether this finger exists , because article It's a list of objects , So there is detail_info = article[0]
If article non-existent , We will redirect to the home page , Then start what I said above get Method pass value ：

return redirect('/?error=find_nothing')

So if we enter an error value in the input box , Our route shows this very well ：

So how do I get it at the front end find_nothing This word ？

placeholder="{
{ request.GET.error }}"

hold placeholder Just write this for the contents

If you have any better method of redirection and value transfer, please make comments in the comment area