python - 属性错误: 'GqlQuery' object has no attribute 'Key'

Question

如何检索和显示 GQL 查询返回的多个结果的键？

ma​​in.py

class MainPage(webapp2.RequestHandler):
    def get(self):          

        author = "William Shakespeare"

        q = db.GqlQuery("SELECT * FROM Book " +
                        "WHERE author = :1 ", author)
        keys = q.Key

        template_values = { 
            'author': author,
            'key': key,         
        }       

        template = jinja_environment.get_template('index.html')
        self.response.out.write(template.render(template_values))

---

更新 1:

当我使用时

keys = q.key()

我收到此错误:

File "C:\programming_google_app_engine_repo\datastore\main.py", line 17, in get key = q.key() AttributeError: 'GqlQuery' object has no attribute 'key'

Answer 1

您的代码存在多个问题。请退后一步，思考一下您想要做什么，并再次浏览一下文档。

问题1
GqlQuery 的结果没有键。您需要使用 .get() 或 .fetch(1) 来访问 Book 对象。

q = db.GqlQuery("SELECT * FROM Book WHERE author = :1 ", author)
my_book = q.get()

问题2
要获取方法的值，您需要记住包含括号。

my_book_key = my_book.key() # don't forget the parens/brackets

template_values = { 
    'author': author,
    'key': my_book_key,         
}