Mongodb仅返回数组中匹配的元素

Question

是否可能只返回包含Accessories

的数组中匹配的元素

输入样本

[
{
  "values":[
     "Aerial and fa ade cables Accessories",
     "LANmark 5 Shielded Cable",
     "Market challenges"
  ],
  "doc":"doc1"
},
{
  "values":[
     "Aerial and fa ade cables ",
     "Tools Accessories"
  ],
  "doc":"doc2"
}
]

预期产量

 "Aerial and fa ade cables Accessories",
 "Tools Accessories"

Answer 1

此代码段应在此处运行：
Mongo v4.2.3

db.collection.aggregate([
   {$unwind: "$values"},
   {$match: { values: { $regex: /accessories/i } }},
   {$project:{values: 1, _id: 0}}
])