Express Cassandra Auto-Load Models from a Directory - models

Question

我基本上是在尝试从教程中实现express-cassandra人员模型。

我从model文件夹中自动加载模型时遇到问题。我的模型位于/models/PersonModel.js。

module.exports = {
    fields:{
        name    : "text",
        surname : "text",
        age     : "int"
    },
    key:["name"]
}

初始化代码位于index.js上一级。这只是从教程中复制粘贴。初始化工作得很好，不会引发错误。

var models = require('express-cassandra');
//Tell express-cassandra to use the models-directory, and
//use bind() to load the models using cassandra configurations.
models.setDirectory( __dirname + '/models').bind(
    {
        clientOptions: {
            contactPoints: ['127.0.0.1'],
            protocolOptions: { port: 9042 },
            keyspace: 'mykeyspace',
            queryOptions: {consistency: models.consistencies.one}
        },
        ormOptions: {
            //If your keyspace doesn't exist it will be created automatically
            //using the default replication strategy provided here.
            defaultReplicationStrategy : {
                class: 'SimpleStrategy',
                replication_factor: 1
            },
            migration: 'safe',
            createKeyspace: true
        }
    },
    function(err) {
        if(err) console.log(err.message);
        else console.log(models.timeuuid());
    }
);

当我尝试插入条目时出现问题。我收到一个错误TypeError: models.instance.Person is not a constructor.原因是我猜该模型没有自动加载。在模型对象的转储中，我可以看到目录设置正确，实例模型为空。

我尝试按照教程进行操作。我错过了什么吗？有没有人是自动加载模型的工作示例？

Answer 1

迟到总比没有好！

">

bind"是异步的，"function(err( {"是回调。

把你的"插入条目"代码放在那里，它会运行正常。

即。您正在尝试在初始化数据库之前插入该项。

这样：

models.setDirectory( __dirname + '/models').bind(
    {
        clientOptions: {
            contactPoints: ['127.0.0.1'],
            protocolOptions: { port: 9042 },
            keyspace: 'mykeyspace',
            queryOptions: {consistency: models.consistencies.one}
        },
        ormOptions: {
            defaultReplicationStrategy : {
                class: 'SimpleStrategy',
                replication_factor: 1
            },
            migration: 'safe'
        }
    },
    function(err) {
        if(err) throw err;
      addUser();
      console.log("err thing");
        // You'll now have a `person` table in cassandra created against the model
        // schema you've defined earlier and you can now access the model instance
        // in `models.instance.Person` object containing supported orm operations.
    }
);
function addUser(){
  var john = new models.instance.Person({
      name: "John",
      surname: "Doe",
      age: 32,
      created: Date.now()
  });
  john.save(function(err){
      if(err) {
          console.log(err);
          return;
      }
      console.log('Yuppiie!');
  });
}