如何从嵌套在数组中的数组更新项目 [英] How to update item from array nested within array
问题描述
我正在通过最新的C#驱动程序(当前为v2.7.0)使用MongoDB 4.0.我有一个文档,其中Options
和Options
具有Inventory
.因此,换句话说,库存清单嵌套在一组期权中.如何降低到库存水平并仅更新库存?
I'm using MongoDB 4.0 via the latest C# driver (v2.7.0 at this time). I have a document which has Options
and Options
have Inventory
. So in other words, an array of inventory is nested within an array of options. How do I get down to the inventory level and update the inventory only?
这是我的文档以JSON形式显示的样子:
Here's what my document looks like in JSON form:
{
"Options": [
{
"Id": 1,
"Description": "This is one option",
"Inventory": [
{
"Id": 1,
"Name": "Box of stuff"
},
{
"Id": 2,
"Name": "Another box of stuff"
}
]
},
{
"Id": 2,
"Description": "This a second option",
"Inventory": [
{
"Id": 1,
"Name": "Box of stuff"
},
{
"Id": 2,
"Name": "Another box of stuff"
}
]
}
]
}
使用C#驱动程序,如果我知道选项的ID和库存项目的ID,如何在单个选项内更改单个库存项目的名称?
Using the C# driver, how do I change the name of a single inventory item within a single option, if I know the Id of the option and the Id of the inventory item?
推荐答案
在MongoDB 4.0中,您可以使用$[<identifier>]
In MongoDB 4.0 you can use the $[<identifier>]
syntax and add ArrayFilters
to UpdateOptions
parameter:
var filter = Builders<Model>.Filter.Empty;
var update = Builders<Model>.Update.Set("Options.$[option].Inventory.$[inventory].Name", "New name");
var arrayFilters = new List<ArrayFilterDefinition>();
ArrayFilterDefinition<BsonDocument> optionsFilter = new BsonDocument("option.Id", new BsonDocument("$eq", optionId));
ArrayFilterDefinition<BsonDocument> inventoryFilter = new BsonDocument("inventory.Id", new BsonDocument("$eq", inventoryId));
arrayFilters.Add(optionsFilter);
arrayFilters.Add(inventoryFilter);
var updateOptions = new UpdateOptions { ArrayFilters = arrayFilters };
var result = DefaultCollection.UpdateOne(filter, update, updateOptions);
这将唯一地标识需要在Options
That will uniquely identify Inventory
item that needs to be updated inside Options
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