我在Google App Engine上使用带有WTForms(doc)的Flask.为选择字段生成具有空值的字段的最佳方法是什么?
form.group_id.choices = [(g.key().id(), g.name) for g in Group.all().order('name')]
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表单字段中是否有类似"blank = True"的内容?
myfield = wtf.SelectField()
Run Code Online (Sandbox Code Playgroud) 给出了GAE的后续模型:
avatar = db.BlobProperty()
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通过调用图像实例属性高度或宽度(请参阅文档):
height = profile.avatar.height
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抛出以下错误:
AttributeError:'Blob'对象没有属性'height'
PIL已安装.
使用Dropwizard身份验证0.9.0-SNAPSHOT
我想检查数据库用户(UserDAO)的凭据.
我得到以下异常
!org.hibernate.HibernateException:当前没有会话绑定到执行上下文
如何将会话绑定到Authenticator?或者有更好的方法来检查数据库用户?
认证者类
package com.example.helloworld.auth;
import com.example.helloworld.core.User;
import com.example.helloworld.db.UserDAO;
import com.google.common.base.Optional;
import io.dropwizard.auth.AuthenticationException;
import io.dropwizard.auth.Authenticator;
import io.dropwizard.auth.basic.BasicCredentials;
public class ExampleAuthenticator implements Authenticator<BasicCredentials, User> {
UserDAO userDAO;
public ExampleAuthenticator(UserDAO userDAO) {
this.userDAO = userDAO;
}
@Override
public Optional<User> authenticate(BasicCredentials credentials) throws AuthenticationException {
Optional<User> user;
user = (Optional<User>) this.userDAO.findByEmail(credentials.getUsername());
if ("secret".equals(credentials.getPassword())) {
return Optional.of(new User(credentials.getUsername()));
}
return Optional.absent();
}
}
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应用程序类
@Override
public void run(HelloWorldConfiguration configuration, Environment environment) throws Exception {
final UserDAO userDAO = new UserDAO(hibernate.getSessionFactory()); …Run Code Online (Sandbox Code Playgroud) 来自python我在delphi5中寻找与此python代码(sets)相当的东西:
>>> x = set("Hello")
>>> x
set(['H', 'e', 'l', 'o'])
>>> y = set("Hallo")
>>> y
set(['a', 'H', 'l', 'o'])
>>> x.intersection(y)
set(['H', 'l', 'o'])
Run Code Online (Sandbox Code Playgroud) 对于应用程序,我需要使用谷歌播放服务用于位置目的.
有没有办法将位置服务('com.google.android.gms:play-services-location:7.0.0')包含到.apk中,以便最终用户无需通过Play商店更新播放服务如果设备上安装了旧版本?
请求(GET)或(POST):
http:// localhost:8080/images?name = iVBORw0KGgoAAAANSUhEUgAAAAUA%20AAAFC ......
响应:
状态代码:414 Request-URI Too Long Connection:close Content-Length:0
如何增加请求大小?