MongoDB:如何将一个模式用作不同文件中定义的不同集合的子文档 [英] MongoDB: How to use one schema as sub-document for different collections defined in different files
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问题描述
我有这个架构:
var ParameterSchema = new Schema({
id: {
type: String,
trim: true,
default: ''
},
value: {
type: String,
trim: true,
default: ''
}
});
我想在两个或多个集合中将其用作子文档,这些集合在不同的文件中定义,如下所示:
And I want to use it as sub-document, in two or more collections which are defined in different files like this:
文件1
var FirstCollectionSchema = new Schema({
name: {
type: String,
trim: true,
default: ''
},
parameters: [ParameterSchema]
});
文件2
var SecondCollectionSchema = new Schema({
description: {
type: String,
trim: true,
default: ''
},
parameters: [ParameterSchema]
});
因此,问题是:如何仅在另一个文件中一次定义 ParameterSchema ,并从文件1 和文件2 .
so, the question is: How can I define ParameterSchema one time only, in another file, and use it from File 1 and from File 2.
推荐答案
将参数子文档架构导出为模块.
Export the parameter sub-doc schema as a module.
// Parameter Model file 'Parameter.js'
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ParameterSchema = new Schema({
id: {
type: String,
trim: true,
default: ''
},
value: {
type: String,
trim: true,
default: ''
}
});
module.exports = ParameterSchema;
// Not as a mongoose model i.e.
// module.exports = mongoose.model('Parameter', ParameterSchema);
现在在父文档中需要导出的模块架构.
Now require the exported module schema in your parent document.
// Require the model exported in the Parameter.js file
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var Parameter = require('./Parameter');
var FirstCollectionSchema = new Schema({
name: {
type: String,
trim: true,
default: '
},
parameters: [Parameter]
});
module.exports = mongoose.model('FirstCollection', FirstCollectionSchema);
现在保存集合和子文档.
Now you save the collection and sub document.
var FirstCollection = require('./FirstCollection')
var feat = new FirstCollection({
name: 'foo',
parameters: [{
id: 'bar',
value: 'foobar'
}]
});
feat.save(function(err) {
console.log('Feature Saved');
})
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