我正在尝试从深度嵌套的数组中删除重复的值。我将数据库的结构放在下面。我想将步骤的位置相互比较，并检查是否重复。我当时在考虑使用db.collection.aggregate，但是在尝试搜索所有步骤时，这变成了一个问题，因为据我所知{ $unwind: '$mapbox.routes.legs.0.steps' }要求这些步骤有特定的索引。
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"legs" : [
{
"distance" : 105336.1,
"duration" : 8259.5,
"steps" : [
{
"distance" : 132.5,
"duration" : 50,
"geometry" : "iv||H_{f^w@b@??AFDZ??H`@?@DT??BL???B@LN`A??Lx@??BP",
"name" : "Mariaplaats",
"ref" : null,
"destinations" : null,
"exits" : null,
"driving_side" : "right",
"mode" : "driving",
"maneuver" : {
"location" : [
5.117934,
52.089493
]
有人知道我如何比较步骤的位置吗？
答案 0 :(得分：0)
最后，我停止制作用于连接mongodb和清理数据库的单独文件，并开始使用现有的API创建调用。在此调用中，我循环浏览了数据库中的步骤，并将位置映射到键。之后，我检查该键是否已经存在并将该索引推入重复数组。
然后，我继续遍历重复列表，并使用步骤将列表中的重复项拼接起来。之后，我运行以下函数来更新条目：Sub test()
Dim arr As Variant, aKeys As Variant, aItems As Variant
Dim dict As New Scripting.Dictionary
Dim posArr As String
Dim i As Long, k As Long
With Sheets("Sheet1")
arr = .Range(.Cells(2, 1), .Cells(.Cells(.Rows.Count, 1).End(xlUp).Row, 2))
End With
With Application
' Separates the arr array into two 1D arrays
aKeys = .Transpose(.Index(arr, 0, 1))
aItems = .Transpose(.Index(arr, 0, 2))
' Loops through aKeys array
For i = LBound(aKeys) To UBound(aKeys)
' Reset the posArr string, this is used for indexing the arrays at the correct locations
posArr = vbNullString
' Test if key already exists in dictionary. As we are getting all the possible values in one go we don't
' need to worry about if it does exist. Testing here means we skip the second loop if not needed
If Not dict.Exists(aKeys(i)) Then
' Loop through aKeys to find all the positions of the items we want in the array
For k = LBound(aKeys) To UBound(aKeys)
' If the key in position k is equal to the key in position i then add it to posArr string
If aKeys(k) = aKeys(i) Then
' We will late split this into an array itself on the "," delimiter
posArr = posArr & k & ","
End If
Next k
' Add our key and all our matching items to the dictionary
' Here we split the posArr string on the "," delimiter and index the aItems array. This returns
' All the values from aItems that have a matching position in the aKeys array.
' For this to work it aKeys and aItems must have the exact same size (i.e. 1D and matching length)
dict.Add Key:=aKeys(i), Item:=.Index(aItems, Split(Left(posArr, Len(posArr) - 1), ","))
End If
Next i
End With
' Read back the dictionary
' Delete this and update with whatever you want to do with your data - This is currently just a check everything
' has worked as expected
Dim dictKey
Dim dictStr As String
dictStr = "{"
For Each dictKey In dict.Keys
dictStr = dictStr & vbNewLine & vbTab & "'" & dictKey & "':[" & Join(dict(dictKey), ",") & "],"
Next dictKey
dictStr = Left(dictStr, Len(dictStr) - 1) & vbNewLine & "}"
MsgBox dictStr
End Sub