小编Sha*_*aft的帖子

我想从我的控制器发送JSON.我有以下配置.

spring-servlet.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <mvc:annotation-driven/>

    <mvc:resources mapping="/resources/**" location="/resources/"/>
    <context:component-scan base-package="com.castle.controllers"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

.js:

function testAjax() {
    var data = {userName: "MyUsername", password:"Password"};
    $.ajax({
        url: 'ajax/test.htm',
        dataType : 'json',
        type : 'POST',
        contentType: "application/json",
        data: JSON.stringify(data),
        success: function(response){
            alert('Load was performed.');
        }
    });
}

UserTest.java:

public class UserTest {
    private String userName;
    private String password;

    public String getUserName() …

我在实体中有这样的字段:

private String userId;
private String username;
private Date created;
private List<Comment> comments = new ArrayList<>();

Comment 有这样的领域:

private String userId;
private String username;
private String message;
private Date created;

我需要进行聚合,并收到类似这样的内容:

{
  "userId" : "%some_userId%",
  "date" : "%some_date%",
  "commentsQty" : 100,
  "isCommented" : true
}

我的聚合看起来像这样:

{ "aggregate" : "%entityName%" , "pipeline" : [
   { "$project" : { 
              "username" : 1 , 
              "userId" : 1 , 
              "created" : 1 , 
              "commentQty" : { "$size" : [ "$comments"]}}}]}

它工作正常.但我还需要检查,IF注释数组包含一些注释,具体的userId.我尝试了这个,但它无法执行:

{ "aggregate" …