静脉遗传的静力学方法

Question

我在Node.js应用程序中使用Mongoose,我想使用模型的继承.我遵循这里给出的指令mongoose和其他链接中的继承,但我无法弄清楚如何继承静态方法.

这是我尝试的:

// The BaseSchema class :
function BaseSchema(objectName, schema) {
    log.trace('BaseSchema CTOR : objectName=%s schema=%s', objectName, schema);
    Schema.apply(this, [schema]);

    var _objectName = objectName;
...
}
BaseSchema.prototype = new Schema();
BaseSchema.prototype.constructor = BaseSchema;

// !!! Here I try to expose the removeAll statics methods for all sub-schema !!!
BaseSchema.prototype.removeAll = function() { ... }

这是继承的类

// The inherited class
var AccountSchema = new BaseSchema('account', {
...
}
mongoose.model('Account', AccountSchema);

pb是每次我尝试使用removeAll函数.例如 :

var Account = mongoose.model('Account');
Account.removeAll(function () {
            done();
        });    

我收到此错误消息:

TypeError: Object function model(doc, fields, skipId) {
    if (!(this instanceof model))
      return new model(doc, fields, skipId);
    Model.call(this, doc, fields, skipId);
  } has no method 'removeAll'

我尝试使用不同的combinaison来声明removeAll方法但没有成功:

BaseSchema.prototype.statics.removeAll = function() { ... }
BaseSchema.statics.removeAll = function() { ... }

在此先感谢您的帮助 !

JM.

Answer 1

昨天我遇到了同样的问题,结果做了这样的事情:

var Schema = require('mongoose').Schema;

function AbstractSchema() {
    Schema.apply(this, arguments);

    this.add({
        name: String,
        // ...your fields
    });

    this.statics.removeAll = function(){
        this.remove({}).exec();
        // ... your functionality
    };
}

然后创建你的模型; mongoose.model('MyModel', new AbstractSchema())并MyModel.removeAll();应努力!