Django：在短语中搜索单个单词的第一个字母？

Question

I've got a Django model called Author , with a field called name , which isn't split up into lastname/firstname:

class Author(models.Model):
    name = models.CharField(max_length=200, unique=True)

For example, I have an Author entry with name 'Donald Knuth'.

Now I'd like to query by name, using istartswith at the start of each word within the name field .

So I'd like to be able to query with ' Kn ', and get ' Donald Knuth ' back.

Something like:

authors = Author.objects.filter(name__word__istartswith="Kn")

Is this possible in Django?

Answer 1

You can use iregex lookup:

import re

text = "Kn"
text = re.escape(text) # make sure there are not regex specials
authors = Author.objects.filter(name__iregex=r"(^|\s)%s" % text)

This isn't very efficient, but should work. On MySQL you can try taking advantage of full-text search features . On other DBs you'll need some extra tools to make an efficient full-text search (like django-haystack ).

Answer 2

For MySQL, [[:<:]] matches the beginning of the word.

searchStr = "Kn"
authors = Author.objects.filter(name__iregex=r"[[:<:]]{0}".format(searchStr))