Ecto.Query.CompileError p.league（）。id（）不是有效的查询表达式

Question

我试图编写一个简单的Ecto查询，但我收到的错误是我没有完全理解。

基本上我尝试将两个ID相互匹配。这是我目前的尝试：

查询

public class SerialTest extends JFrame implements SerialPortEventListener{


SerialPort serialPort;

  Vector<String> header;
 Vector<Vector<String>> dataList=new Vector<Vector<String>>();
 Vector<String> lista=new Vector<String>();

DefaultTableModel tableMod;

private static final String PORT_NAMES[] = { 
        "/dev/tty.usbserial-A9007UX1", // Mac OS X
                    "/dev/ttyACM0", // Raspberry Pi
        "/dev/ttyUSB0", // Linux
        "COM8", // Windows
};
private BufferedReader input;
private OutputStream output;
private static final int TIME_OUT=200;
private static final int DATA_RATE=9600;
JButton btn=new JButton("Insert");

SerialTest(){
    super("Serial Test");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    header=new Vector<String>();
    header.add("PWM");
    header.add("Uin");
    header.add("Uout"); 
    btn.setSize(70, 50);
    JPanel panelbtn=new JPanel();
    panelbtn.add(btn);
    tableMod=new DefaultTableModel();
  JTable table=new JTable(tableMod);
   tableMod.addColumn("PWM");
    tableMod.addColumn("Uin");
    tableMod.addColumn("Uout");
 btn.setVisible(true);
 btn.addActionListener(new ActionListener(){

        @Override
        public void actionPerformed(ActionEvent e) {                
            for(Vector<String> v: dataList){
                    tableMod.addRow(v);
            }       
        }
     });
  JFrame frame=new JFrame();
    frame.add(panelbtn);
    table.setPreferredScrollableViewportSize(new Dimension(500,70));
    JScrollPane scrollPane=new JScrollPane(table);
    getContentPane().add(scrollPane,BorderLayout.CENTER);
    getContentPane().add(panelbtn, BorderLayout.NORTH);
    frame.setVisible(true);
}

public void initialize(){
    //System.setProperty("gnu.io.rxtx.SerialPorts", "/dev/ttyACM0");

    CommPortIdentifier portId=null;
    Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

    while(portEnum.hasMoreElements()){
        CommPortIdentifier currPortId=(CommPortIdentifier)portEnum.nextElement();
        for(String portName : PORT_NAMES){
            if(currPortId.getName().equals(portName)){
                portId=currPortId;
                break;
            }
        }
    }
    if(portId==null){
        System.out.println("Could non find COM port");
        return;
    }

    try {
        serialPort=(SerialPort)portId.open(this.getClass().getName(),TIME_OUT);
        serialPort.setSerialPortParams(DATA_RATE, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        input=new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
        output=serialPort.getOutputStream();
        serialPort.addEventListener(this);
        serialPort.notifyOnDataAvailable(true);
        serialPort.disableReceiveTimeout();
        serialPort.enableReceiveThreshold(1);

    } catch (Exception e) {
        System.err.println(e.toString());
    }   
}

public synchronized void close(){
    if(serialPort != null){
        serialPort.removeEventListener();
        serialPort.close();
    }
}

@Override
public void serialEvent(SerialPortEvent oEvent) {
    if(oEvent.getEventType()==SerialPortEvent.DATA_AVAILABLE){
        try{
            String inputLine=input.readLine();
            String[] rows=inputLine.split(",");
            for(String row: rows){
                row=row.trim();
                lista.addAll(Arrays.asList(row.split("\n")));
                dataList.add(lista);
            }

            System.out.println(dataList);

        }catch(Exception e){
            System.err.println(e.toString());
        }return;
    }

}

public static void main(String[] args) throws Exception {

    SerialTest main=new SerialTest();
    main.initialize();
    main.setVisible(true);


    Thread t=new Thread(){
        public void run(){
            try{Thread.sleep(100000);}catch(InterruptedException ie){}

        }
    };
  t.start();
            }
        }

错误

from(p in prediction_scores, where: p.league.id == ^league.id) 

我有** (Ecto.Query.CompileError) `p.league().id()` is not a valid query expression (ecto) expanding macro: Ecto.Query.where/3 属于PredictionScore，然后我有一个传递单独的League的函数。我的查询是尝试将prediction_score联盟ID与传入的联盟ID进行匹配。

希望这是足够的信息......如果您需要了解更多信息，请与我们联系。我很乐意更新。

Answer 1

您需要明确地进行连接：

from p in prediction_scores,
  join: l in assoc(p, :league),
  where: l.id == ^league.id