Mongodb concat int and string

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Add Stage 2.5 😛

{
    $project:{
        FileName:1,
            FileSize:{$substr:["$FileSize", 0, -1 ]}
    }
}

FileSize is a integer and there is no operation to convert it to String. So you can use hack, and use substr to convert it to string, 0 for starting and -1 rest of the string.

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