订阅在GAE中为SearchableModel指定索引属性集
2009 8 8 10:36 AM 1718次查看
分类：Google App Engine 标签：Google App Engine, Python
昨天Google更新了这个API，可以自定义索引的属性集，可以定义多条索引，可以指定搜索时使用的索引，算是弥补了一大不足。（之前强制索引所有字符串类型，浪费磁盘空间且降低性能。）
自定义索引集实际上很简单，自定义一个名为SearchableProperties的类方法，返回一个需要索引的属性的2维列表即可，例如：
@classmethod
def SearchableProperties(cls):
return [['book', 'author'], ['book'], search.ALL_PROPERTIES]搜索时则需要指定使用的索引，方法同样很简单，用properties指定即可，例如：
Article.all().search('Lem', properties=['book', 'author'])假如省略properties参数，则会用search.ALL_PROPERTIES来做索引。而如果这个索引不存在，则会抛出异常。
最后给个自己写的例子：
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db
from google.appengine.ext import search
def unquote(string):
from urllib import unquote
return unicode(unquote(string), 'utf8', 'ignore')
class TestModel(search.SearchableModel):
title = db.StringProperty()
text = db.TextProperty()
comment = db.StringProperty(indexed=False)
rating = db.RatingProperty()
def toString(self):
return 'title:%s\ntext:%s\ncomment:%s\nrating:%d\n' % (self.title, self.text, self.comment, self.rating)
@classmethod
def SearchableProperties(cls):
return [['title', 'text']]
class Add(webapp.RequestHandler):
def get(self, title, text, comment, rating):
TestModel(title=unquote(title), text=unquote(text), comment=unquote(comment), rating=int(rating)).save()
class Search(webapp.RequestHandler):
def get(self, words, rating):
all = TestModel.all()
entities = all.search(unquote(words), properties=['title', 'text']).filter('rating >= ', int(rating)).order('-rating').fetch(1000)
self.response.headers['Content-Type'] = 'text/plain; charset=utf-8'
for entity in entities:
self.response.out.write(entity.toString() + '\n')
class MainPage(webapp.RequestHandler):
def get(self):
entities = TestModel.all().order('-rating').fetch(1000)
self.response.headers['Content-Type'] = 'text/plain; charset=utf-8'
for entity in entities:
self.response.out.write(entity.toString() + '\n')
application = webapp.WSGIApplication([('/', MainPage),
(r'/add/(.+)/(.+)/(.*)/(\d{1,2})', Add),
(r'/search/(.+)/(\d{1,2})', Search)], debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
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