[英]Query With Multi-Level Nested Arrays Using Linq
I have a model such as: 我有一个模型,例如:
{
nestedArray1: [
{
nestedArray2: [
{
id: 1
}
]
}
]
}
I am trying to get the items which contain nestedArray2 with the id value that is among the list x = [1, 2, 3, 4, 5, ...]
. 我正在尝试获取包含nestedArray2的ID为列表x = [1, 2, 3, 4, 5, ...]
。
I tried to run the following query with no avail: 我尝试运行以下查询无济于事:
var query = model.AsQueryable().Where(m => m.nestedArray1.Any(s => s.nestedArray2.Any(m => ids.Any(id => id == m.id))));
var results = query.ToListAsync();
It says that any filter is unsupported. 它说不支持任何过滤器。
What is the proper way of writing such a query using Linq? 使用Linq编写这样的查询的正确方法是什么?
NOTE: 注意:
Here is how I can do it using Mongo query syntax: 这是使用Mongo查询语法的方法:
db.getCollection('model').find({
"nestedArray1": {
$elemMatch:{
nestedArray2:{
$elemMatch:{
"id" : {$in: [1, 2, 3, 4, 5] }
}
}
}
}
}) })
And here is how I can do it using C# without Linq query syntax: 这是我如何在不使用Linq查询语法的情况下使用C#做到这一点:
var ids = new List<int>() { 1, 2, 3, 4, 5};
var filter = new FilterDefinitionBuilder<Model>()
.ElemMatch(p => p.nestedArray1, new FilterDefinitionBuilder<NestedModel1>()
.ElemMatch(s => s.nestedArray2, new FilterDefinitionBuilder<NestedModel2>()
.In(m=> m.id, ids)));
return await Collection.Find(filter).ToListAsync();
According to your model the items of nestedArray2 only have a field with one ID. 根据您的模型,nestedArray2的项只有一个具有一个ID的字段。
So considering your example above, you should have something like this (i think): 因此,考虑到上面的示例,您应该有以下内容(我认为):
var query = model.AsQueryable().Where(m => m.nestedArray1.Any(s => s.nestedArray2.Any(m => ids.Contains(m.id))));
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