Javascript 如何在 Mongoose 模型中定义方法？
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How do I define methods in a Mongoose model?
提问by Shamoon
My locationsModelfile:
我的locationsModel文件：
mongoose = require 'mongoose'
threeTaps = require '../modules/threeTaps'
Schema = mongoose.Schema
ObjectId = Schema.ObjectId
LocationSchema =
latitude: String
longitude: String
locationText: String
Location = new Schema LocationSchema
Location.methods.testFunc = (callback) ->
console.log 'in test'
mongoose.model('Location', Location);
To call it, I'm using:
要调用它，我正在使用：
myLocation.testFunc {locationText: locationText}, (err, results) ->
But I get an error:
但我收到一个错误：
TypeError: Object function model() {
Model.apply(this, arguments);
} has no method 'testFunc'
回答by pdoherty926
You didn't specify whether you were looking to define class or instance methods. Since others have covered instance methods, here'show you'd define a class/static method:
您没有指定是要定义类方法还是实例方法。既然别人已经覆盖实例方法，这里是你如何定义一个类/静态方法：
animalSchema.statics.findByName = function (name, cb) {
return this.find({
name: new RegExp(name, 'i')
}, cb);
}
回答by iZ.
Hmm - I think your code should be looking more like this:
嗯 - 我认为你的代码应该看起来更像这样：
var mongoose = require('mongoose'),
Schema = mongoose.Schema,
ObjectId = Schema.ObjectId;
var threeTaps = require '../modules/threeTaps';
var LocationSchema = new Schema ({
latitude: String,
longitude: String,
locationText: String
});
LocationSchema.methods.testFunc = function testFunc(params, callback) {
//implementation code goes here
}
mongoose.model('Location', LocationSchema);
module.exports = mongoose.model('Location');
Then your calling code can require the above module and instantiate the model like this:
然后您的调用代码可以需要上述模块并像这样实例化模型：
var Location = require('model file');
var aLocation = new Location();
and access your method like this:
并像这样访问您的方法：
aLocation.testFunc(params, function() { //handle callback here });
回答by Duncan_m
See the Mongoose docs on methods
var animalSchema = new Schema({ name: String, type: String });
animalSchema.methods.findSimilarTypes = function (cb) {
return this.model('Animal').find({ type: this.type }, cb);
}
回答by user3573644
Location.methods.testFunc = (callback) ->
console.log 'in test'
should be
应该
LocationSchema.methods.testFunc = (callback) ->
console.log 'in test'
The methods have to be a part of the schema. Not the model.
方法必须是模式的一部分。不是模型。
