javascript - 带 Mongoose 的 MongoDB - 在哪里放置语法以确保跨多个字段的索引？

Question

我正在尝试实现 this solution而且我不确定把它放在哪里。我看到 db 变量被频繁调用，但我对 node 和 mongoDb 还是个新手，所以我不知道如何在我的模型中调用它。这是确保索引跨越多个字段的语法...

db.collection.ensureIndex( {
    description: "text",
    title: "text"
} );

这是我的模型...

    //  Module dependencies.
var mongoose        = require('mongoose'),
    config          = require('../../config/config'),
    Schema          = mongoose.Schema,
    findOrCreate    = require('mongoose-findorcreate'),
    textSearch      = require('mongoose-text-search');

// Product Schema
var ProductSchema = new Schema({
    created: {
        type: Date,
        default: Date.now
    },
    retailer: {
        type: String,
        required: true,
        trim: true
    },
    retailer_category: {
        type: String,
        required: true,
        trim: true
    },
    product_id: {
        type: String,
        required: true,
        trim: true
    },
    link: {
        type: String,
        trim: true
    },
    title: {
        type: String,
        trim: true
    },
    price: {
        type: Number
    },
    // Rating - 0 out of 5 (can be decimal)
    rating: {
        type: Number
    },
    description: {
        type: String,
        trim: true
    },
    variations: {
        type: Schema.Types.Mixed,
        default: []
    },
    images: {
        type: Boolean,
        default: false
    }
}); 

// Validations
ProductSchema.index({ retailer: 1, product_id: 1 }, { unique: true });

// Statics
ProductSchema.statics = {
    load: function(id, cb) {
        this.findOne({
            _id: id
        }).exec(cb);
    }
};

// Plug-Ins
ProductSchema.plugin(findOrCreate);
ProductSchema.plugin(textSearch);

mongoose.model('Product', ProductSchema);

Answer 1

var Product = mongoose.model('Product', ProductSchema);

Product.ensureIndexes( function(err) { 
    if (err) { 
      console.log(err); 
    } 
})

值得注意的是:

When your application starts up, Mongoose automatically calls ensureIndex for each defined index in your schema. While nice for development, it is recommended this behavior be disabled in production since index creation can cause a significant performance impact. Disable the behavior by setting the autoIndex option of your schema to false.

来自 http://mongoosejs.com/docs/guide.html