小编Ben*_*jie的帖子

我对Rails比较陌生.我想为使用多态关联的模型添加关联,但只返回特定类型的模型,例如:

class Note < ActiveRecord::Base
  # The true polymorphic association
  belongs_to :subject, polymorphic: true

  # Same as subject but where subject_type is 'Volunteer'
  belongs_to :volunteer, source_association: :subject
  # Same as subject but where subject_type is 'Participation'
  belongs_to :participation, source_association: :subject
end

我通过阅读有关ApiDock的关联尝试了大量的组合,但似乎没有任何东西完全符合我的要求.这是我迄今为止最好的:

class Note < ActiveRecord::Base
  belongs_to :subject, polymorphic: true
  belongs_to :volunteer, class_name: "Volunteer", foreign_key: :subject_id, conditions: {notes: {subject_type: "Volunteer"}}
  belongs_to :participation, class_name: "Participation", foreign_key: :subject_id, conditions: {notes: {subject_type: "Participation"}}
end

我希望它通过这个测试:

describe Note do
  context 'on volunteer' do
    let!(:volunteer) …

虽然git svn clone -s https://svn.example.com/repo/我收到了以下输出:

r3073 = a6132f3a937b632015e66d694250da9f606b8333 (refs/remotes/trunk)
Found possible branch point: https://svn.example.com/repo/trunk => https://svn.example.com/repo/branches/v1.3, 3073
W: Refspec glob conflict (ref: refs/remotes/trunk):
expected path: repo/branches/trunk
    real path: repo/trunk
Continuing ahead with repo/trunk
W: Refspec glob conflict (ref: refs/remotes/trunk):
expected path: repo/branches/trunk
    real path: repo/trunk
Continuing ahead with repo/trunk
W: Refspec glob conflict (ref: refs/remotes/trunk):
expected path: repo/branches/trunk
    real path: repo/trunk
Continuing ahead with repo/trunk
W: Refspec glob conflict (ref: refs/remotes/trunk):
expected path: repo/branches/trunk
    real path: repo/trunk
Continuing …

我正在使用Amazon Linux AMI并对其进行一些自定义修改(添加了axis2server等)并将其保存为新的AMI.现在我想要做的是当AMI启动时,启动axis2server(ie.saxis2server应该在实例启动时自动启动).为此,我使用了如下的init脚本并运行以下命令:

chkconfig --add axisservice

但是当我从我的图像中启动一个新实例时,axis2server还没有开始.

我只需要在启动时执行脚本/home/ec2-user/axis2-1.6.1/bin/axis2server.sh.我在这里错过了什么吗？

#! /bin/sh
# Basic support for IRIX style chkconfig
###
# chkconfig: 235 98 55
# description: Manages the services you are controlling with the chkconfig command
###

case "$1" in
  start)
        echo -n "Starting axisservice"        
        touch ~/temp.txt
        cd /home/ec2-user/axis2-1.6.1/bin
        ./axis2server.sh &
        echo "."
        ;;
  stop)
        echo -n "Stopping axisservice"
        echo "."
        ;;

  *)
        echo "Usage: /sbin/service axisservice {start|stop}"
        exit 1
esac

exit 0

我还浏览了https://help.ubuntu.com/community/CloudInit,它提供了一种名为User-Data Scripts的机制,用户可以在启动脚本时执行脚本.

$ euca-run-instances --key mykey …

我不得不频繁地离开电脑,我想触发一些命令,当我的iPhone离我的iMac足够远时(靠近它与2-3米远/墙的另一侧).几分钟的延迟很好.

部分解决方案:接近

我已经下载了reduxcomputing-proximity并且它可以工作,但这仅在设备进入/退出蓝牙范围时触发,但我想要的范围要小得多.

(接近轮询[IOBluetoothDevice -remoteNameRequest]以查看设备是否处于蓝牙范围内.)

增强功能:rawRSSI

[IOBluetoothDevice -rawRSSI]当我连接到iPhone时,我已经习惯了RSSI(当断开时它才会返回+127),但是为了节省iPhone的电池寿命,我宁愿避免建立完整的蓝牙连接.

我是否认为保持连接会比每隔几分钟轮询消耗更多的电池寿命？

我已经覆盖了这里的isInRange方法,proximity为我提供了一个工作解决方案,与以前的remoteNameRequest:方法相比,这可能是相对电池密集的:

- (BOOL)isInRange {
    BluetoothHCIRSSIValue RSSI = 127; /* Valid Range: -127 to +20 */
    if (device) {
        if (![device isConnected]) {
            [device openConnection];
        }
        if ([device isConnected]) {
            RSSI = [device rawRSSI];
            [device closeConnection];
        }
    }
    return (RSSI >= -60 && RSSI <= 20);
}

(Proximity使用同步调用 - 如果我符合我的需要,我会将其编辑为异步,但现在这并不重要.)

在Linux下:l2ping - 查询扫描？

这个SO帖子引用了在'查询扫描'期间获得RSSI,听起来像我想要的,但它谈到使用Linux Bluez库,而我在Mac上 - …

我的xcode版本是3.2.5.

我的应用程序是在iPhone上创建的.我希望我为iPhone编写的应该运行并适用于iPad.如何解决这个问题？

帮帮我朋友,如何创建这种类型的应用程序？