我是Meteor的新手,尤其是MongoDB.
关于这个问题,我已经搜索了很多,但没有发现与此有关.
所以有一个应用程序包含两个集合:EventsCollection并RacesCollection在Meteor服务器上运行.
在RacesCollection有记录等数:
RacesCollection.insert({raceId:"r1", eventId:"e1", raceName:"Moto race 1", status:"statusDetail", mode:"modeDetail"});
RacesCollection.insert({raceId:"r2", eventId:"e1", raceName:"Moto race 2", status:"statusDetail", mode:"modeDetail"});
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这是包含行的结果集合 eventId = e1
var race = RacesCollection.find({eventId: "e1"});
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现在我想做的是简单地访问racejavascript 的字段,比如race.raceId,race.raceName.怎么实现这个?是否有访问特定数据字段的getter方法?
race如果它包含多行,如何遍历多行?
任何建议都会得到满足.
我在Mod_Security包中看到了名为standalone的模块; 但我不确定如何在制作和安装后使用它!启动时有没有好的资源?
我正在尝试此处描述的 Baeldung Drools Spring Integration。但是,在解决 maven 依赖项的第一步中,出现以下错误:
[错误] 项目 com.baeldung:spring-drools:1.0.0-SNAPSHOT (spring-drools\pom.xml) 有 1 个错误 [错误] com.baeldung:spring-drools:1.0.0 的不可解析父 POM -SNAPSHOT:找不到工件 com.baeldung:parent-modules:pom:1.0.0-SNAPSHOT 和“parent.relativePath”指向错误的本地 POM@第 9 行,第 13 列 -> [帮助 2]
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>spring-drools</artifactId>
<version>1.0.0-SNAPSHOT</version>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- ... -->
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-ci</artifactId>
<version>${drools-version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>${drools-version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>${drools-version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>${drools-version}</version>
</dependency>
<!--spring integration -->
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-spring</artifactId> …Run Code Online (Sandbox Code Playgroud) 我在MongoDB中有一个ISSUES数据库,有些问题有注释,这是一个数组;每个评论都有一个作者。如何统计每个作者发表的评论数量?
我试过了
db.test.issues.group(
{
key = "comments.username":true;
initial: {sum:0},
reduce: function(doc, prev) {prev.sum +=1},
}
);
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但运气不好:(
一个样品:
{
"_id" : ObjectId("50f48c179b04562c3ce2ce73"),
"project" : "Ruby Driver",
"key" : "RUBY-505",
"title" : "GETMORE is sent to wrong server if an intervening query unpins the connection",
"description" : "I've opened a pull request with a failing test case demonstrating the bug here: https://github.com/mongodb/mongo-ruby-driver/pull/134\nExcerpting that commit message, the issue is: If we do a secondary read that is large enough to require sending …Run Code Online (Sandbox Code Playgroud)