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我正在使用MongoDB 3.2并试图找出是否有将多个字段组合到数组字段中的方法。举例来说,假设我有一个查询,看起来像这样:如何在MongoDB中将多个字段组合到数组中
db.companies.find({},
{
_id: 0,
CompanyName: 1,
CompanyAlias1: 1,
CompanyAlias2: 1,
CompanyAlias3: 1,
CompanyAlias4: 1
}).limit(4);
上面的查询返回下列文件:
{ "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,我想列举CompanyAlias [X]字段是组合成一个名为CompanyAliases的数组。所以结果应该是这样的:
{ "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,并从RDBMS世界未来我仍然得到我的脑海里缠绕着它的许多概念。关于如何实现上述示例的任何见解都非常感谢!