Как интерпретировать этот код ошибки при использовании оператора агрегации $ lower в MongoDB? - PullRequest
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Как интерпретировать этот код ошибки при использовании оператора агрегации $ lower в MongoDB?

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/ 21 апреля 2020

Я новичок в mongoDB (только сегодня!). Я выполняю следующий запрос (к базе данных о насилии с применением оружия), который объединит массив строк в одну строку, разделенную пробелом. Связанная строка должна называться incidentString, а массив строк - misc.incident_characteristics. 

db.fin.aggregate([
  { "$addFields": {
    "incidentString": { 
      "$reduce": {
        "input": "$misc.incident_characteristics",
        "initialValue": "",
        "in": {
          "$cond": {
            "if": { "$eq": [ { "$indexOfArray": [ "$values", "$$this" ] }, 0 ] },
            "then": { "$concat": [ "$$value", "$$this" ] },
            "else": { "$concat": [ "$$value", " ", "$$this" ] }
          }    
        }
      }        
    }
  }}
])

Хотя кажется, что она работает для многих строк в моей базе данных, в конечном итоге она возвращает ошибку, которую я не могу понять, как интерпретировать. Я покажу вывод ниже. Обратите внимание, что incidentString успешно создан для некоторых записей в базе данных, но я показываю только одну в выходных данных ниже. 

{
    "_id" : 488992,
    "date" : ISODate("2013-06-15T00:00:00Z"),
    "location_info" : {
        "state" : "Rhode Island",
        "city_or_county" : "Providence",
        "address" : "256 Hartford Ave",
        "latitude" : 41.8173,
        "longitude" : -71.4516
    },
    "casualties" : {
        "n_killed" : 1,
        "n_injured" : 3
    },
    "sources" : {
        "incident_url" : "http://www.gunviolencearchive.org/incident/488992",
        "source_url" : "http://wpri.com/2014/12/19/luis-fat-boy-gonzalez-to-learn-punishment/",
        "incident_url_fields_missing" : false,
        "sources" : [
            "http://turnto10.com/archive/shooting-in-providence-leaves-3-injured-and-a-12-year-old-girl-dead",
            "http://www.providencejournal.com/article/20141118/News/311189975",
            "http://patch.com/rhode-island/cranston/5-indicted-for-killing-of-former-nk-girl-cranston",
            "http://wpri.com/2014/12/19/luis-fat-boy-gonzalez-to-learn-punishment/"
        ]
    },
    "law_info" : {
        "congressional_district" : 2,
        "state_house_district" : 9,
        "state_senate_district" : 7
    },
    "gun_info" : {
        "gun_attr" : [
            {
                "_id" : 0,
                "gun_stolen" : "Unknown",
                "gun_type" : "Unknown"
            }
        ],
        "n_guns_involved" : 1
    },
    "misc" : {
        "incident_characteristics" : [
            "Shot - Wounded/Injured",
            "Shot - Dead (murder, accidental, suicide)",
            "Mass Shooting (4+ victims injured or killed excluding the subject/suspect/perpetrator, one location)",
            "Gang involvement",
            "Possession of gun by felon or prohibited person"
        ],
        "notes" : "ms; 1 killed, 3 inj at graduation party by rival gang. All 5 perps guilty and sentenced."
    },
    "participant_info" : [
        {
            "_id" : 0,
            "participant_age" : "12",
            "participant_age_group" : "Teen 12-17",
            "participant_gender" : "Female",
            "participant_name" : "Aynis Vargas",
            "participant_status" : "Killed",
            "participant_type" : "Victim"
        },
        {
            "_id" : 1,
            "participant_age" : "44",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Female",
            "participant_name" : "Vilma Tineo",
            "participant_status" : "Injured",
            "participant_type" : "Victim"
        },
        {
            "_id" : 2,
            "participant_age" : "23",
            "participant_age_group" : "Adult 18+",
            "participant_name" : "Elaine Devargas",
            "participant_status" : "Injured",
            "participant_type" : "Victim"
        },
        {
            "_id" : 3,
            "participant_age" : "33",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Female",
            "participant_name" : "Eugelyn Cabera-Martinez",
            "participant_status" : "Injured",
            "participant_type" : "Victim"
        },
        {
            "_id" : 4,
            "participant_age" : "21",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Male",
            "participant_name" : "Branden Castro",
            "participant_status" : "Unharmed, Arrested",
            "participant_type" : "Subject-Suspect"
        },
        {
            "_id" : 5,
            "participant_age" : "20",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Male",
            "participant_name" : "Ricardo Vasquez",
            "participant_status" : "Unharmed, Arrested",
            "participant_type" : "Subject-Suspect"
        },
        {
            "_id" : 6,
            "participant_age" : "23",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Male",
            "participant_name" : "Luis Gonzales",
            "participant_status" : "Unharmed, Arrested",
            "participant_type" : "Subject-Suspect"
        },
        {
            "_id" : 7,
            "participant_age" : "19",
            "participant_age_group" : "Adult 18+",
            "participant_gender" : "Male",
            "participant_name" : "Angel Valerio",
            "participant_status" : "Unharmed, Arrested",
            "participant_type" : "Subject-Suspect"
        },
        {
            "_id" : 8,
            "participant_age" : "17",
            "participant_age_group" : "Teen 12-17",
            "participant_status" : "Unharmed, Arrested",
            "participant_type" : "Subject-Suspect"
        }
    ],
    "incidentString" : " Shot - Wounded/Injured Shot - Dead (murder, accidental, suicide) Mass Shooting (4+ victims injured or killed excluding the subject/suspect/perpetrator, one location) Gang involvement Possession of gun by felon or prohibited person"
}
Error: command failed: {
    "ok" : 0,
    "errmsg" : "$reduce requires that 'input' be an array, found: \"Shot - Dead (murder, accidental, suicide)\"",
    "code" : 40080,
    "codeName" : "Location40080"
} : getMore command failed: {
    "ok" : 0,
    "errmsg" : "$reduce requires that 'input' be an array, found: \"Shot - Dead (murder, accidental, suicide)\"",
    "code" : 40080,
    "codeName" : "Location40080"
}

Из рассмотрения ошибки ("$ lower требует, чтобы" input "был массив ... "), кажется misc.incident_characteristics не является ли массив строк для чего-то в Location40080? Как мне go исправить это?

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