How to concat multiple fields in mongoose query?

Question

I am trying to find() all docs with LIKE 'query.name' in concatenated fields instead of using $or to search in separated ones.

SQL query would be:

SELECT * FROM table WHERE column.name + ' ' + column.surname LIKE query.name

This is the current code:

Model.find()
.and([
  {
    $or: [
      { name: new RegExp(req.query.name, 'i') },
      { surname: new RegExp(req.query.name, 'i') }
    ]
  },
  {
    $or: [
      { workPlace: new RegExp(req.query.place, 'i') },
      { location: new RegExp(req.query.place, 'i') }
    ]
  }
])

Answer 1

这可以在两阶段聚合查询中实现：其想法是$concat在第一阶段使用连接名称和位置字段作为单独的过滤器属性$addFields，然后在下一阶段使用$matchand进行搜索。$regex

例子：

db.collection.aggregate([
  {
    $addFields: {
      nameFilter: {
        $concat: ["$name", " ", "$surname"],
      },
      locationFilter: {
        $concat: ["$workplace", " ", "$location"],
      },
    },
  },
  {
    $match: {
      nameFilter: {
        $regex: req.query.name,
        $options: "i",
      },
      locationFilter: {
        $regex: req.query.place,
        $options: "i",
      },
    },
  },
]);

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