我在清洁查询我的亲子而不在列表的根目录重复子代时遇到问题。
目的
public class Office
{
public int Id { get; set; }
[Required]
public string Name { get; set; }
public bool Inactive { get; set; }
public int? ParentId { get; set; }
[ForeignKey("ParentId")]
public Office Parent { get; set; }
[InverseProperty("Parent")]
public virtual ICollection<Office> Children { get; set; }
}
}
查询
public async Task<IEnumerable<Office>> GetOffices()
{
return await _context.Offices.Where(os => !os.Inactive)
.Include(o => o.Parent)
.Include(o => o.Children).ToListAsync();
}
结果
{
"id": 5,
"name": "AA",
"inactive": false,
"parentId": null,
"parent": null,
"children": []
},
{
"id": 10,
"name": "BAA",
"inactive": false,
"parentId": 2,
"parent": {
"id": 2,
"name": "BA",
"inactive": false,
"parentId": null,
"parent": null,
"children": []
},
"children": [
{
"id": 1011,
"name": "BAAA",
"inactive": false,
"parentId": 10,
"children": []
}
]
},
{
"id": 1011,
"name": "BAAA",
"inactive": false,
"parentId": 10,
"parent": {
"id": 10,
"name": "BAA",
"inactive": false,
"parentId": 2,
"parent": {
"id": 2,
"name": "BA",
"inactive": false,
"parentId": null,
"parent": null,
"children": []
},
"children": []
},
"children": []
},
,
{
"id": 2,
"name": "BA",
"inactive": false,
"parentId": null,
"parent": null,
"children": [
{
"id": 10,
"name": "BAA",
"inactive": false,
"parentId": 2,
"children": [
{
"id": 1011,
"name": "BAAA",
"inactive": false,
"parentId": 10,
"children": []
}
]
}
]
}
这在根级别也有子对象,所以我尝试了这个
public async Task<IEnumerable<Office>> GetOffices()
{
return await _context.Offices.Where(os => !os.Inactive && !os.ParentId.HasValue).Include(o => o.Parent).Include(o => o.Children).ToListAsync();
}
这是另一个查询的结果
{
"id": 5,
"name": "AA",
"inactive": false,
"parentId": null,
"parent": null,
"children": []
},
{
"id": 2,
"name": "BA",
"inactive": false,
"parentId": null,
"parent": null,
"children": [
{
"id": 10,
"name": "BAA",
"inactive": false,
"parentId": 2,
"children": null
}
]
}
这样就省去了ID 1010 BAAA子对象。想法上我想让它出来
{
"id": 5,
"name": "AA",
"inactive": false,
"parentId": null,
"parent": null,
"children": []
},
{
"id": 2,
"name": "BA",
"inactive": false,
"parentId": null,
"parent": null,
"children": [
{
"id": 10,
"name": "BAA",
"inactive": false,
"parentId": 2,
"children": [
{
"id": 1011,
"name": "BAAA",
"inactive": false,
"parentId": 10,
"children": []
}
]
}
]
}
无论我如何堆叠查询,我似乎都无法以这种方式显示它。有没有一种方法可以调整查询以允许此查询,或者通过简单的后查询命令仅修剪子级的根级别对象?
如果要获取有限数量的子级别(在此示例中为2),则可以尝试:
await _context.Offices
.Where(os => !os.Inactive && !os.ParentId.HasValue)
.Include(o => o.Parent)
.Include(o => o.Children)
.ThenInclude(o => o.Children)
.ToListAsync()
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