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我正在使用MongoDB 3.2並試圖找出是否有將多個字段組合到數組字段中的方法。舉例來說,假設我有一個查詢,看起來像這樣:如何在MongoDB中將多個字段組合到數組中
db.companies.find({},
{
_id: 0,
CompanyName: 1,
CompanyAlias1: 1,
CompanyAlias2: 1,
CompanyAlias3: 1,
CompanyAlias4: 1
}).limit(4);
上面的查詢返回下列文件:
{ "CompanyName" : "Company ABC", "CompanyAlias1" : "Company ABC, Inc." }
{ "CompanyName" : "ACME Corp.", "CompanyAlias1" : "ACME Corporation", "CompanyAlias2" : "Coyote Lawncare" }
{ "CompanyName" : "Green Tea Sippers" }
{ "CompanyName" : "JS Inc", "CompanyAlias1" : "John Smith Ent", "CompanyAlias2" : "DBA J Smith", "CompanyAlias3" : "Mr. J Tree Climbing", "CompanyAlias4" : "Another crazy name", "CompanyAlias5" : "last one" }
相反,我想列舉CompanyAlias [X]字段是組合成一個名爲CompanyAliases的數組。所以結果應該是這樣的:
{ "CompanyName" : "Company ABC", "CompanyAliases" : [{ "Alias" : "Company ABC, Inc."} ]}
{ "CompanyName" : "ACME Corp.", "CompanyAliases" : [{ "Alias" : "ACME Corporation"}, { "Alias" : "Coyote Lawncare"} ]}
{ "CompanyName" : "Green Tea Sippers" }
{ "CompanyName" : "JS Inc", "CompanyAliases" : [{"Alias" : "John Smith Ent"}, {"Alias" : "DBA J Smith"}, {"Alias" : "Mr. J Tree Climbing"}, {"Alias" : "Another crazy name"}, {"Alias" : "last one"}]}
我非常新的MongoDB,並從RDBMS世界未來我仍然得到我的腦海裏纏繞着它的許多概念。關於如何實現上述示例的任何見解都非常感謝!