在mongodb中是否可以按子对象查询？

Question

我在 mongo 有一个文档：

{
  "_id" : ObjectId("54eb5189ad9685bbb622ca52"),
  "header" : {
    "title" : "Project Name 1",
    "header_img" : "project_name_1.png",
    "project_stats" : {
        "sqFt" : 20000,
        "tons" : 300,
        "duration" : "6 months",
        "type" : "education facility",
        "summary" : "Give quick summary of problem solved."
    }
},
"row_project_detail" : {
    "project_logo" : "project_name_1_logo.png",
    "header" : "Project Name 1 was a project where...",
    "paragraph" : "blah blah blah blah"
},
"row_1" : {
    "img" : "project_name_2.png"
},
"row_2" : {
    "img_1" : "project_name_3.png",
    "img_2" : "project_name_4.png"
},
"row_3" : {
    "img" : "project_name_5.png"
},
"row_4" : {
    "img" : "project_name_6.png"
}
}

我曾尝试通过 db.projects.find({ header: { title: "Project Name 1"} }); 进行查询，但未产生结果。如何通过 header 对象中的 title 键查询？这是可能的还是我只需要从 header 子对象复制 title 键并将其放在文档的根目录中？

Answer 1

使用点符号：

db.projects.find({ "header.title": "Project Name 1"});

在mongodb中是否可以按子对象查询？

In mongodb is it possible to query by sub-object?

mongodb

mongodb-query