Question

我正在使用 MongoDb 数据库和grails 2.2.2 在这里我想分配一个随机的Id而不是默认的增量Id由Db生成。

例如： abcd.com/demo/view/14524 而不是
的 abcd.com/demo/view/5

我的域代码：

student.groovy

class student{
static mapping = {
        id generator:'assigned'
}

static constraints = {
        id generator:'assigned'
}

def beforeInsert() {
        Random randomNumber = new Random();

        id=randomNumber.nextInt(100**4);

        println "id "+ id;

    }
}

这是依赖列表： -

grails.project.dependency.resolution = { 
    // inherit Grails' default dependencies 
    inherits("global") { 
        // specify dependency exclusions here; for example, uncomment this to disable ehcache: 
        // excludes 'ehcache' 
    } 
    log "error" // log level of Ivy resolver, either 'error', 'warn', 'info', 'debug' or 'verbose' 
    checksums true // Whether to verify checksums on resolve 
    legacyResolve false // whether to do a secondary resolve on plugin installation, not advised and here for backwards compatibility 

    repositories { 
        inherits true // Whether to inherit repository definitions from plugins 

        grailsPlugins() 
        grailsHome() 
        grailsCentral() 

        mavenLocal() 
        mavenCentral() 

        // uncomment these (or add new ones) to enable remote dependency resolution from public Maven repositories 
        //mavenRepo "http://snapshots.repository.codehaus.org" 
        //mavenRepo "http://repository.codehaus.org" 
        //mavenRepo "http://download.java.net/maven/2/" 
        //mavenRepo "http://repository.jboss.com/maven2/" 
    } 

    dependencies { 
        // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes e.g. 

        // runtime 'mysql:mysql-connector-java:5.1.20' 
                compile 'org.imgscalr:imgscalr-lib:4.1' 
    } 

    plugins { 
        runtime ":hibernate:$grailsVersion" 
        runtime ":jquery:1.8.3" 

        runtime ":resources:1.1.6" 

        // Uncomment these (or add new ones) to enable additional resources capabilities 
        runtime ":zipped-resources:1.0" 
        runtime ":cached-resources:1.0" 
        //runtime ":yui-minify-resources:0.1.4" 

                compile ":cache-headers:1.1.5" 

        build ":tomcat:$grailsVersion" 

        runtime ":database-migration:1.2.1" 

        compile ':cache:1.0.1' 

                compile ":rest:0.7" 

                compile ":rendering:0.4.4" 

                compile ":mail:1.0.1" 

                compile ":oauth:2.1.0" 

                compile ":spring-security-core:1.2.7.3" 

                compile ":spring-security-ui:0.2"   

                compile ":jquery-ui:1.8.24" 

                compile ":famfamfam:1.0.1" 

                compile ":calendar:1.2.1" 

    } 
}

但是给出错误。是否有其他选项可以分配随机ID？

谢谢。 :)

Answer 1

您可以将Mongo的ObjectId用作随机标识符：

import org.bson.types.ObjectId

class Student {
   ObjectId id
   String name
}

如何使用grails 2.2.2在mongoDb数据库中定义随机Id到数据库表id？

1 个答案: