Question

这是来自mongoDB集合的样本文档：-

type MyQueryParam name a = QueryParam' '[Optional, Lenient]

类别数组包含该位置所属的所有类别ID。

{
    "place_id" : "57222c6f498e78e3bfe0a575",
    "title_AR" : "University Institute Hall",
    "title_EN" : "University Institute Hall",
    "description_AR" : "",
    "description_EN" : "",
    "best_photo" : "https://igx.4sqi.net/img/general/250x250/8862268_8oi3vr81Zm3ucytWjoSyvWXXS-7BUpNxKgyJvj0Lusc.jpg",
    "city_AR" : "Kolkata",
    "city_EN" : "Kolkata",
    "state_AR" : "West Bengal",
    "state_EN" : "West Bengal",
    "country" : "IN",
    "postal_code_AR" : "700073",
    "postal_code_EN" : "700073",
    "location_AR" : "7, Bankim Chatterjee St, Kolkata 700073, West Bengal, India",
    "location_EN" : "7, Bankim Chatterjee St, Kolkata 700073, West Bengal, India",
    "latitude" : 22.5744745110906,
    "longitude" : 88.3630291046031,
    "loc" : {
        "type" : "Point",
        "coordinates" : [ 
            88.3630291046031, 
            22.5744745110906
        ]
    },
    "website" : "",
    "email" : "",
    "contact_number_AR" : "+913322416214",
    "contact_number_EN" : "+913322416214",
    "ratings_AR" : "",
    "ratings_EN" : "",
    "no_of_comments_AR" : 0,
    "no_of_comments_EN" : 0,
    "categories" : "4d4b7104d754a06370d81259,5032792091d4c4b30a586d5c,4d4b7104d754a06370d81259,5032792091d4c4b30a586d5c",
    "category_array" : [ 
        "4d4b7104d754a06370d81259", 
        "5032792091d4c4b30a586d5c", 
        "4d4b7104d754a06370d81259", 
        "5032792091d4c4b30a586d5c"
    ],
    "created_date" : "2018-05-31 16:39:33",
    "modified_date" : "2018-05-31 16:39:33",
    "photo_saved" : 0,
    "tip_saved" : 0,
    "updated_at" : ISODate("2018-05-31T11:09:33.000Z"),
    "created_at" : ISODate("2018-05-31T11:09:33.000Z")
}

我想根据位置和类别获取地点。这是我的脚本：-

"category_array" : [ 
            "4d4b7104d754a06370d81259", 
            "5032792091d4c4b30a586d5c", 
            "4d4b7104d754a06370d81259", 
            "5032792091d4c4b30a586d5c"
        ]

现在是问题所在。根据{{3}}：-

要进行精确的数组匹配，包括元素的顺序：-

db.runCommand( { geoNear: "foursquare_places", near: { type: "Point", coordinates: [ 88.363892, 22.572645 ] }, spherical: true, query: { category_array: { $all: ["5032792091d4c4b30a586d5c"] }}, maxDistance: 500 } )
要查找一个包含元素“ red”和“ blank”的数组，而不考虑顺序或该数组中的其他元素：-

db.inventory.find( { tags: ["red", "blank"] } )
以下示例查询所有文档，其中tag是一个包含字符串“ red”作为其元素之一的数组

db.inventory.find( { tags: { $all: ["red", "blank"] } } )

要提取其category_array包含以下数组的一个或所有元素的所有记录的查询是什么？

db.inventory.find( { tags: "red" } )

Answer 1

“一个或全部”对我来说毫无意义。假设它是“至少之一”，则需要使用$in：

UITextField

将返回@objc func hideTextField(_ sender: UIButton) { if let field = sender.superview?.superview as? UITextField, !field.isHidden { UIView.animate(withDuration: 0.2) { field.text = "" field.isHidden = true } } }至少具有3个字符串之一的所有文档。

如何使用MongoDB根据geoNear 2dsphere索引和类别数组获取地点？

1 个答案: