挂钩到特定的 Mongoose 模型查询

Question

我在 invoice.js 中有自包含模型

'use strict';

// load the things we need
var mongoose = require('mongoose');
var auth_filter = require('../../auth/acl/lib/queryhook');
var invoice_db = mongoose.createConnection(config.mongo.url + '/invoiceDB');

// PROMISE LIBRARY USED FOR ASYNC FLOW
var promise  = require("bluebird");

var Schema     = mongoose.Schema, ObjectId = Schema.Types.ObjectId;

// define the schema for our invoice details model
var invoicedetailSchema = new Schema({
    //SCHEMA INFO
});
var InvoiceModel = invoice_db.model('InvoiceDetail', invoicedetailSchema);
// create the model for seller and expose it to our app
auth_filter.registerHooks(InvoiceModel);


module.exports = InvoiceModel;

我想挂接到此模型的预查询。我正在尝试使用钩子来实现这一点，但我没有成功。我正在使用 auth_filter 文件注册钩子，如下所示

'use strict';

var hooks = require('hooks'),
    _ = require('lodash');


exports.registerHooks = function (model) {


model.pre('find', function(next,query) {
      console.log('test find');
      next();
   });

model.pre('query', function(next,query) {
      console.log('test query');
      next();
   });

};

我做错了什么？我想把钩子分开，这样我就可以调用很多不同的模型。

Answer 1

查询hooks 需要在模式而不是模型上定义。另外，没有'query' 钩子，query 对象作为this 而不是作为参数传递给钩子回调。

所以把registerHooks改成：

exports.registerHooks = function (schema) {

    schema.pre('find', function(next) {
          var query = this;
          console.log('test find');
          next();
       });
};

然后在创建模型之前使用架构调用它：

var invoicedetailSchema = new Schema({
    //SCHEMA INFO
});

auth_filter.registerHooks(invoicedetailSchema);

var InvoiceModel = invoice_db.model('InvoiceDetail', invoicedetailSchema);