Mongoose:嵌套参考模型人口 [英] Mongoose: nested ref models population
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问题描述
如何填充嵌套的引用模型?
How can I populate nested referenced models?
例如:
// 'Collection' model
var CollectionSchema = new Schema({
collection_name: String,
_groups: [{ type: Schema.Types.ObjectId, ref: 'Group' }],
});
// 'Group' model
var GroupSchema = new Schema({
group_name: String,
_item: { type: Schema.Types.ObjectId, ref: 'Item' } // To be populated
_meta: [ { type: Schema.Types.ObjectId, ref: 'Meta' } // To be populated
});
// 'Item' model
var ItemSchema = new Schema({
item_name: String,
item_description: String
});
// 'Meta' model
var MetaSchema = new Schema({
meta_name: String,
meta_value: String
});
我想在集合模型中的_group内填充每个_item。
我的意思是得到这样的东西:
I'd like to populate each "_item" inside "_group" in "Collection" models. I mean getting something like this:
{
collection_name: "I'm a collection"
_groups: [
{ _id: ObjectId("520eabd1da5ff8283c000009"),
group_name: 'Group1',
_item: { _id: ObjectId("520eabd1da5ff8283c000004"),
item_name: "Item1 name",
item_description: "Item1 description"
},
_meta: {
_id: ObjectId("520eabd1da5ff8283c000001"),
meta_name= "Metadata name",
meta_value = "metadata value"
}
},
{ _id: ObjectId("520eabd1da5ff8283c000003"),
group_name: 'Group2',
_item: { _id: ObjectId("520eabd1da5ff8283c000002"),
item_name: "Item2 name",
item_description: "Item2 description"
},
_meta: {
_id: ObjectId("520eabd1da5ff8283c000001"),
meta_name= "Metadata name",
meta_value = "metadata value"
}
}
]
}
推荐答案
var Group = mongoose.model('Group', GroupSchema);
Group.find().populate('_item').populate('_meta').exec(function (error, groups) {
//groups will be an array of group instances and
// _item and _meta will be populated
});
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