{"id":29688,"date":"2023-04-24T01:10:30","date_gmt":"2023-04-09T03:16:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/mongoid%e4%bd%95%e6%97%b6%e5%8f%8d%e6%98%a0%e5%85%b3%e7%b3%bb%e7%9a%84%e5%ad%90%e5%85%83%e7%b4%a0%ef%bc%9f\/"},"modified":"2025-08-12T15:23:13","modified_gmt":"2025-08-12T07:23:13","slug":"mongoid%e4%bd%95%e6%97%b6%e5%8f%8d%e6%98%a0%e5%85%b3%e7%b3%bb%e7%9a%84%e5%ad%90%e5%85%83%e7%b4%a0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/mongoid%e4%bd%95%e6%97%b6%e5%8f%8d%e6%98%a0%e5%85%b3%e7%b3%bb%e7%9a%84%e5%ad%90%e5%85%83%e7%b4%a0%ef%bc%9f\/","title":{"rendered":"Mongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f"},"content":{"rendered":"

\u5982\u679c\u8981\u5c06\u5176\u6dfb\u52a0\u5230\u73b0\u6709\u6587\u6863\u4e2d<\/p>\n

\u6709\u8bb8\u591a\u5728\u4ee5\u4e0b\u6a21\u5f0f\u4e0b\u8fdb\u884c\u8003\u8651\u3002<\/p>\n
class<\/span> Article<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :title<\/span>\r\n  field<\/span> :author<\/span>\r\n  has_many<\/span> :comments<\/span>,<\/span> class_name: <\/span>'Comment'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
class<\/span> Comment<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :author<\/span>\r\n  field<\/span> :text<\/span>\r\n\r\n  belongs_to<\/span> :article<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5229\u7528\u4e0a\u8ff0\u7684\u6a21\u578b\uff0c\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u3002<\/p>\n
    \n
  1. \n
      \u521b\u5efa\u4e00\u6761\u6587\u7ae0\u7684\u6570\u636e<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u521b\u5efa\u4e00\u6761\u8bc4\u8bba\u7684\u6570\u636e<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \u5c06\u7b2c\u4e8c\u6b65\u521b\u5efa\u7684\u6570\u636e\u5b58\u5165\u6587\u7ae0\u6570\u636e\u7684\u8bc4\u8bba\u4e2d<\/ol>\n
            irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>create<\/span>(<\/span>title: <\/span>'test article'<\/span>,<\/span> author: <\/span>'John'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def694121b6206de44b31f5, title: \"test article\", author: \"John\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> comment<\/span> =<\/span> Comment<\/span>.<\/span>create<\/span>(<\/span>author: <\/span>'Tom'<\/span>,<\/span> text: <\/span>'comment text'<\/span>)<\/span>\r\n=><\/span> #<Comment _id: 5def697321b6206de44b31f6, author: \"Tom\", text: \"comment text\", article_id: nil><\/span>\r\nrb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> comment<\/span>\r\n=><\/span> #<Comment _id: 5def697321b6206de44b31f6, author: \"Tom\", text: \"comment text\", article_id: nil><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>comments<\/span> <<<\/span> comment<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"comments\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def697321b6206de44b31f6'), \"author\"=>\"Tom\", \"text\"=>\"comment text\", \"article_id\"=>BSON::ObjectId('5def694121b6206de44b31f5')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x7034371467232...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"comments\", \"filter\"=>{\"article_id\"=>BSON::ObjectId('5def694121b6206de44b31f5')}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70343714672320 type=uuid data=0x425a912cb15c4242...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> [<\/span>#<Comment _id: 5def697321b6206de44b31f6, author: \"Tom\", text: \"comment text\", article_id: BSON::ObjectId('5def694121b6206de44b31f5')>]<\/span>\r\n<\/code><\/pre>\n
            \u5728\u4e0a\u8ff0 irb(main):003 \u7684\u65f6\u5019\uff0cMongoDB \u4e0a\u5e76\u6ca1\u6709\u4fdd\u5b58\u3002
            \n\u5728 irb(main):004 \u65f6\uff0c\u4e00\u65e6\u5c06 article.comments \u5b58\u50a8\u8d77\u6765\uff0c\u5c31\u4f1a\u7acb\u5373\u63d2\u5165\u3002<\/p>\n
            ><\/span> db<\/span>.<\/span>comments<\/span>.<\/span>find<\/span>()<\/span> \/\/ irb(main):003 \u306e\u3042\u3068<\/span>\r\n><\/span> db<\/span>.<\/span>comments<\/span>.<\/span>find<\/span>()<\/span> \/\/ irb(main):004 \u306e\u3042\u3068<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5def697321b6206de44b31f6<\/span>\"<\/span>),<\/span> \"<\/span>author<\/span>\"<\/span> :<\/span> \"<\/span>Tom<\/span>\"<\/span>,<\/span> \"<\/span>text<\/span>\"<\/span> :<\/span> \"<\/span>comment text<\/span>\"<\/span>,<\/span> \"<\/span>article_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5def694121b6206de44b31f5<\/span>\"<\/span>)<\/span> }<\/span>\r\n<\/code><\/pre>\n
            \u53ea\u6709\u4e00\u4e2a
            \n\u5c06\u6a21\u578b\u66f4\u6539\u4e3a\u4ee5\u4e0b\u5f62\u5f0f\u3002<\/p>\n
            class<\/span> Article<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :title<\/span>\r\n  has_one<\/span> :author<\/span>\r\n  has_many<\/span> :comments<\/span>,<\/span> class_name: <\/span>'Comment'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
            class<\/span> Author<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :name<\/span>\r\n  field<\/span> :age<\/span>\r\n\r\n  belongs_to<\/span> :article<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
            \u4f7f\u7528\u4e0a\u8ff0\u7684\u6a21\u578b\uff0c\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\u3002<\/p>\n
              \n
            1. \n
                \u521b\u5efa\u4e00\u6761\u6587\u7ae0\u6570\u636e<\/ol>\n<\/li>\n<\/ol>\n
                 <\/p>\n
                  \n
                1. \n
                    \u521b\u5efa\u4e00\u6761\u4f5c\u8005\u6570\u636e<\/ol>\n<\/li>\n<\/ol>\n
                     <\/p>\n
                      \u5c06\u6570\u636e2\u4e2d\u521b\u5efa\u7684\u6570\u636e\u5b58\u50a8\u5230\u6587\u7ae0\u6570\u636e\u4e2d\u7684\u4f5c\u8005\u5b57\u6bb5\u4e2d<\/ol>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>create<\/span>(<\/span>title: <\/span>'second article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def73cb21b620e0c14b31f5, title: \"second article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> author<\/span> =<\/span> Author<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'Tom'<\/span>,<\/span> age: <\/span>20<\/span>)<\/span>\r\n=><\/span> #<Author _id: 5def73e521b620e0c14b31f6, name: \"Tom\", age: 20, article_id: nil><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>author<\/span> =<\/span> author<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"authors\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def73e521b620e0c14b31f6'), \"name\"=>\"Tom\", \"age\"=>20, \"article_id\"=>BSON::ObjectId('5def73cb21b620e0c14b31f5')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70343916007920 type=uuid data...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.010<\/span>s<\/span>\r\n=><\/span> #<Author _id: 5def73e521b620e0c14b31f6, name: \"Tom\", age: 20, article_id: BSON::ObjectId('5def73cb21b620e0c14b31f5')><\/span>\r\n<\/code><\/pre>\n
                      \u4e0e has_many \u7684\u4f8b\u5b50\u4e00\u6837\uff0c\u5f53 article.author = author \u65f6\uff0c\u5c06\u6587\u6863\u5199\u5165\u5230 authors \u4e2d\u3002<\/p>\n
                      ><\/span> db<\/span>.<\/span>authors<\/span>.<\/span>find<\/span>()<\/span> \/\/ irb(main):002 \u306e\u3042\u3068<\/span>\r\n><\/span> db<\/span>.<\/span>authors<\/span>.<\/span>find<\/span>()<\/span> \/\/ irb(main):003 \u306e\u3042\u3068<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5def73e521b620e0c14b31f6<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>Tom<\/span>\"<\/span>,<\/span> \"<\/span>age<\/span>\"<\/span> :<\/span> 20<\/span>,<\/span> \"<\/span>article_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5def73cb21b620e0c14b31f5<\/span>\"<\/span>)<\/span> }<\/span>\r\n<\/code><\/pre>\n
                      \u5d4c\u5165\u591a\u4e2a du\u014d g\u00e8)
                      \n\u4fee\u6539\u6a21\u578b\u5982\u4e0b\uff08\u540c\u65f6\u4e5f\u4fee\u6539\u4e86embeds_one\u7684\u9a8c\u8bc1\u90e8\u5206\uff09\u3002<\/p>\n
                      class<\/span> Article<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :title<\/span>\r\n  embeds_one<\/span> :author<\/span>\r\n  embeds_many<\/span> :comments<\/span>,<\/span> class_name: <\/span>'Comment'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
                      class<\/span> Comment<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :author<\/span>\r\n  field<\/span> :text<\/span>\r\n\r\n  embedded_in<\/span> :article<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
                      \u6309\u7167\u4e4b\u524d\u7684\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>create<\/span>(<\/span>title: <\/span>'third article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def78c221b62011e762e62c, title: \"third article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> comment<\/span> =<\/span> Comment<\/span>.<\/span>create<\/span>(<\/span>author: <\/span>'Ken'<\/span>,<\/span> text: <\/span>'new comment'<\/span>)<\/span>\r\nTraceback<\/span> (<\/span>most<\/span> recent<\/span> call<\/span> last<\/span>):<\/span>\r\n        1<\/span>:<\/span> from<\/span> (<\/span>irb<\/span>):<\/span>3<\/span>\r\nMongoid<\/span>::<\/span>Errors<\/span>::<\/span>NoParent<\/span> ()<\/span>\r\nmessage:\r\n  <\/span>Cannot<\/span> persist<\/span> embedded<\/span> document<\/span> Comment<\/span> without<\/span> a<\/span> parent<\/span> document<\/span>.<\/span>\r\nsummary<\/span>:<\/span>\r\n  If<\/span> the<\/span> document<\/span> is<\/span> embedded<\/span>,<\/span> in<\/span> order<\/span> to<\/span> be<\/span> persisted<\/span> it<\/span> must<\/span> always<\/span> have<\/span> a<\/span> reference<\/span> to<\/span> its<\/span> parent<\/span> document<\/span>.<\/span> This<\/span> is<\/span> most<\/span> likely<\/span> caused<\/span> by<\/span> either<\/span> calling<\/span> Comment<\/span>.<\/span>create<\/span> or<\/span> Comment<\/span>.<\/span>create!<\/span> without<\/span> setting<\/span> the<\/span> parent<\/span> document<\/span> as<\/span> an<\/span> attribute<\/span>.<\/span>\r\nresolution<\/span>:<\/span>\r\n  Ensure<\/span> that<\/span> you<\/span>'ve set the parent relation if instantiating the embedded document directly, or always create new embedded documents via the parent relation.\r\nirb(main):003:0> comment = Comment.new(author: '<\/span>Ken<\/span>', text: '<\/span>new<\/span> comment<\/span>')\r\n=> #<Comment _id: 5def792a21b62011e762e62d, author: \"Ken\", text: \"new comment\">\r\nirb(main):004:0> article.comments << comment\r\nMONGODB | [8] localhost:28001 #1 | sandbox.update | STARTED | {\"update\"=>\"articles\", \"ordered\"=>true, \"updates\"=>[{\"q\"=>{\"_id\"=>BSON::ObjectId('<\/span>5<\/span>def78c221b62011e762e62c<\/span>')}, \"u\"=>{\"$push\"=>{\"comments\"=>{\"_id\"=>BSON::ObjectId('<\/span>5<\/span>def792a21b62011e762e62d<\/span>'<\/span>),<\/span> \"author\"<\/span>=><\/span>\"Ken\"<\/span>,<\/span> \"text\"<\/span>=><\/span>\"new comment\"<\/span>}}}}],<\/span> \"lsid\"<\/span>=><\/span>{<\/span>\"id\"<\/span>=>...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>update<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> [<\/span>#<Comment _id: 5def792a21b62011e762e62d, author: \"Ken\", text: \"new comment\">]<\/span>\r\n<\/code><\/pre>\n
                      \u7531\u4e8e\u5b58\u5728embedded_in\u5143\u7d20\uff0c\u56e0\u6b64\u5fc5\u987b\u6307\u5b9a\u7236\u5143\u7d20\uff0c\u5426\u5219Comment.create()\u5c06\u4f1a\u51fa\u9519\u3002<\/p>\n
                      \u5f53article.comments << comment\u53d1\u751f\u65f6\uff0c\u4f1a\u5bf9article\u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n
                      \u5d4c\u5165\u4e00\u4e2a
                      \n\u5c06 author.rb \u5d4c\u5165\u5230 embedded_in \u4e2d\u3002<\/p>\n
                      class<\/span> Author<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :name<\/span>\r\n  field<\/span> :age<\/span>\r\n\r\n  embedded_in<\/span> :article<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
                      \u8fd9\u4e2a\u4e5f\u662f\u7528\u76f8\u540c\u7684\u6b65\u9aa4\u6765\u6267\u884c\u3002<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>create<\/span>(<\/span>title: <\/span>'fourth article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def7a8721b620366a62e62c, title: \"fourth article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> author<\/span> =<\/span> Author<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'Sam'<\/span>,<\/span> age: <\/span>22<\/span>)<\/span> # \u5148\u3068\u540c\u69d8\u306b\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002\u30a8\u30e9\u30fc\u306f\u7701\u7565\u3002<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> author<\/span> =<\/span> Author<\/span>.<\/span>new<\/span>(<\/span>name: <\/span>'Sam'<\/span>,<\/span> age: <\/span>22<\/span>)<\/span>\r\n=><\/span> #<Author _id: 5def7ab121b620366a62e62d, name: \"Sam\", age: 22><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>author<\/span> =<\/span> author<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.update | STARTED | {\"update\"=>\"articles\", \"ordered\"=>true, \"updates\"=>[{\"q\"=>{\"_id\"=>BSON::ObjectId('5def7a8721b620366a62e62c')}, \"u\"=>{\"$set\"=>{\"author\"=>{\"_id\"=>BSON::ObjectId('5def7ab121b620366a62e62d'), \"name\"=>\"Sam\", \"age\"=>22}}}}], \"lsid\"=>{\"id\"=><BSON::Binary:0x7...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>update<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Author _id: 5def7ab121b620366a62e62d, name: \"Sam\", age: 22><\/span>\r\n<\/code><\/pre>\n
                      \u5728 article.author = author \u7684\u540c\u65f6\uff0c\u4e5f\u4f1a\u5c06\u6587\u6863\u5199\u5165 author\uff0c\u7c7b\u4f3c\u4e8e has_one\u3002<\/p>\n
                      \u5982\u679c\u8981\u6dfb\u52a0\u65b0\u6570\u636e\u6a21\u578b\u5c06\u4e0e\u4e0a\u8ff0\u7684\u6bcf\u4e2a\u6a21\u578b\u5177\u6709\u76f8\u540c\u7684\u5f62\u5f0f\u3002<\/p>\n
                      \u7531\u4e8e\u8981\u505a\u7684\u4e8b\u60c5\u57fa\u672c\u76f8\u540c\uff0c\u6240\u4ee5\u4ece\u8fd9\u91cc\u5f00\u59cb\u53ea\u9700\u8981\u5728\u63a7\u5236\u53f0\u4e0a\u64cd\u4f5c\u5e76\u6dfb\u52a0\u6ce8\u91ca\u3002<\/p>\n
                      \u6709\u8bb8\u591a<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>new<\/span>(<\/span>title: <\/span>'fifth article'<\/span>,<\/span> author: <\/span>'John'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def7ef821b6206f8662e62c, title: \"fifth article\", author: \"John\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> comment<\/span> =<\/span> Comment<\/span>.<\/span>create<\/span>(<\/span>author: <\/span>'Ken'<\/span>,<\/span> text: <\/span>'next comment'<\/span>)<\/span>\r\n=><\/span> #<Comment _id: 5def7f1621b6206f8662e62d, author: \"Ken\", text: \"next comment\", article_id: nil><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>comments<\/span> <<<\/span> comment<\/span> # \u3053\u3053\u3067\u306f\u3069\u3061\u3089\u3082\u4fdd\u5b58\u3055\u308c\u306a\u3044<\/span>\r\n=><\/span> [<\/span>#<Comment _id: 5def7f1621b6206f8662e62d, author: \"Ken\", text: \"next comment\", article_id: BSON::ObjectId('5def7ef821b6206f8662e62c')>]<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'fifth article'<\/span>,<\/span> author: <\/span>'John'<\/span>).<\/span>first<\/span> # \u307e\u3060\u306a\u3044\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"fifth article\", \"author\"=>\"John\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> nil<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>005<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"articles\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def7ef821b6206f8662e62c'), \"title\"=>\"fifth article\", \"author\"=>\"John\"}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>006<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'fifth article'<\/span>,<\/span> author: <\/span>'John'<\/span>).<\/span>first<\/span> # \u4fdd\u5b58\u3055\u308c\u305f\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"fifth article\", \"author\"=>\"John\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Article _id: 5def7ef821b6206f8662e62c, title: \"fifth article\", author: \"John\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>007<\/span>:<\/span>0<\/span>><\/span> Comment<\/span>.<\/span>where<\/span>(<\/span>author: <\/span>'Ken'<\/span>,<\/span> text: <\/span>'next comment'<\/span>).<\/span>first<\/span> # comment \u304c\u4fdd\u5b58\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"comments\", \"filter\"=>{\"author\"=>\"Ken\", \"text\"=>\"next comment\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> nil<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>8<\/span>:<\/span>0<\/span>><\/span> comment<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>12<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"comments\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def7f1621b6206f8662e62d'), \"author\"=>\"Ken\", \"text\"=>\"next comment\", \"article_id\"=>BSON::ObjectId('5def7ef821b6206f8662e62c')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x7016285296608...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>12<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>9<\/span>:<\/span>0<\/span>><\/span> Comment<\/span>.<\/span>where<\/span>(<\/span>author: <\/span>'Ken'<\/span>,<\/span> text: <\/span>'next comment'<\/span>).<\/span>first<\/span> # \u4fdd\u5b58\u3055\u308c\u305f\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>13<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"comments\", \"filter\"=>{\"author\"=>\"Ken\", \"text\"=>\"next comment\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>13<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Comment _id: 5def7f1621b6206f8662e62d, author: \"Ken\", text: \"next comment\", article_id: BSON::ObjectId('5def7ef821b6206f8662e62c')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>010<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'fifth article'<\/span>,<\/span> author: <\/span>'John'<\/span>).<\/span>first<\/span>.<\/span>comments<\/span> # \u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u6210\u7acb\u3057\u3066\u3044\u308b\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>14<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"fifth article\", \"author\"=>\"John\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>14<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>15<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"comments\", \"filter\"=>{\"article_id\"=>BSON::ObjectId('5def7ef821b6206f8662e62c')}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70162852966080 type=uuid data=0xa7f9242254954cfb...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>15<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> [<\/span>#<Comment _id: 5def7f1621b6206f8662e62d, author: \"Ken\", text: \"next comment\", article_id: BSON::ObjectId('5def7ef821b6206f8662e62c')>]<\/span>\r\n<\/code><\/pre>\n
                      \u5728\u4fdd\u5b58\u6587\u7ae0\u65f6\uff0c\u5373\u4f7f\u5df2\u7ecf\u6dfb\u52a0\u4e86\u8bc4\u8bba\uff0c\u8bc4\u8bba\u672c\u8eab\u5e76\u4e0d\u4f1a\u88ab\u4fdd\u5b58\u3002
                      \n\u53ea\u6709\u540c\u65f6\u4fdd\u5b58\u4e24\u8005\u624d\u80fd\u5efa\u7acb\u8d77\u5173\u8054\u5173\u7cfb\u3002<\/p>\n
                      \u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u5373\u4f7f\u5148\u4fdd\u5b58\u4e86\u8bc4\u8bba\uff0c\u6587\u7ae0\u4e5f\u4e0d\u4f1a\u88ab\u4fdd\u5b58\u3002
                      \n\u56e0\u6b64\uff0cMongoDB\u4e2d\uff0c\u4e0e\u8bc4\u8bba\u5173\u8054\u7684\u6587\u7ae0\u96c6\u5408articles\u662f\u4e0d\u5b58\u5728\u7684\u3002<\/p>\n
                      \u6709\u4e00\u4e2a<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>new<\/span>(<\/span>title: <\/span>'sixth article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def815721b62004d962e62c, title: \"sixth article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> author<\/span> =<\/span> Author<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'Kenny'<\/span>,<\/span> age: <\/span>21<\/span>)<\/span>\r\n=><\/span> #<Author _id: 5def816421b62004d962e62d, name: \"Kenny\", age: 21, article_id: nil><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>author<\/span> =<\/span> author<\/span>\r\n=><\/span> #<Author _id: 5def816421b62004d962e62d, name: \"Kenny\", age: 21, article_id: BSON::ObjectId('5def815721b62004d962e62c')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'sixth article'<\/span>).<\/span>first<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"sixth article\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> nil<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>005<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"articles\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def815721b62004d962e62c'), \"title\"=>\"sixth article\"}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>006<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'sixth article'<\/span>).<\/span>first<\/span> # article \u306f\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"sixth article\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Article _id: 5def815721b62004d962e62c, title: \"sixth article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>007<\/span>:<\/span>0<\/span>><\/span> Author<\/span>.<\/span>where<\/span>(<\/span>name: <\/span>'Kenny'<\/span>,<\/span> age: <\/span>21<\/span>).<\/span>first<\/span> # author \u306f\u4fdd\u5b58\u3055\u308c\u3066\u3044\u306a\u3044<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"authors\", \"filter\"=>{\"name\"=>\"Kenny\", \"age\"=>21}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> nil<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>8<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>author<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"authors\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def816421b62004d962e62d'), \"name\"=>\"Kenny\", \"age\"=>21, \"article_id\"=>BSON::ObjectId('5def815721b62004d962e62c')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid da...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>9<\/span>:<\/span>0<\/span>><\/span> Author<\/span>.<\/span>where<\/span>(<\/span>name: <\/span>'Kenny'<\/span>,<\/span> age: <\/span>21<\/span>).<\/span>first<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>12<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"authors\", \"filter\"=>{\"name\"=>\"Kenny\", \"age\"=>21}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>12<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Author _id: 5def816421b62004d962e62d, name: \"Kenny\", age: 21, article_id: BSON::ObjectId('5def815721b62004d962e62c')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>010<\/span>:<\/span>0<\/span>><\/span> Article<\/span>.<\/span>where<\/span>(<\/span>title: <\/span>'sixth article'<\/span>).<\/span>first<\/span>.<\/span>author<\/span> # \u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u6210\u7acb\u3057\u3066\u3044\u308b\u3053\u3068\u306e\u78ba\u8a8d<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>13<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"articles\", \"filter\"=>{\"title\"=>\"sixth article\"}, \"sort\"=>{\"_id\"=>1}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>13<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>14<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"authors\", \"filter\"=>{\"article_id\"=>BSON::ObjectId('5def815721b62004d962e62c')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70163658507040 type=uuid data=0xab53b65883964307...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>14<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> #<Author _id: 5def816421b62004d962e62d, name: \"Kenny\", age: 21, article_id: BSON::ObjectId('5def815721b62004d962e62c')><\/span>\r\n<\/code><\/pre>\n
                      \u548chas_many\u4e00\u6837\u3002<\/p>\n
                      \u5d4c\u5165\u5f88\u591a<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>new<\/span>(<\/span>title: <\/span>'seventh article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5def82ee21b620184662e62c, title: \"seventh article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> comment<\/span> =<\/span> Comment<\/span>.<\/span>new<\/span>(<\/span>author: <\/span>'Lita'<\/span>,<\/span> text: <\/span>'wild comment'<\/span>)<\/span>\r\n=><\/span> #<Comment _id: 5def832421b620184662e62d, author: \"Lita\", text: \"wild comment\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>comments<\/span> <<<\/span> comment<\/span>\r\n=><\/span> [<\/span>#<Comment _id: 5def832421b620184662e62d, author: \"Lita\", text: \"wild comment\">]<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>save<\/span> # comment.save \u3067\u3082\u540c\u3058\u6319\u52d5\u3092\u3059\u308b<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"articles\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5def82ee21b620184662e62c'), \"title\"=>\"seventh article\", \"comments\"=>[{\"_id\"=>BSON::ObjectId('5def832421b620184662e62d'), \"author\"=>\"Lita\", \"text\"=>\"wild comment\"}]}], \"lsid\"...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\n<\/code><\/pre>\n
                      \u5c06comment\u5b58\u50a8\u5728article.comments\u4e2d\u5e76\u4fdd\u5b58\uff0c\u4ece\u800c\u4f7f\u5f97\u4e24\u8005\u90fd\u5728\u6570\u636e\u5e93\u4e2d\u5f97\u5230\u53cd\u6620\u3002<\/p>\n
                      \u5d4c\u5165\u4e00\u4e2a<\/p>\n
                      irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> article<\/span> =<\/span> Article<\/span>.<\/span>new<\/span>(<\/span>title: <\/span>'eighth article'<\/span>)<\/span>\r\n=><\/span> #<Article _id: 5df0561821b6205f2062e62c, title: \"eighth article\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> author<\/span> =<\/span> Author<\/span>.<\/span>new<\/span>(<\/span>name: <\/span>'Alex'<\/span>,<\/span> age: <\/span>27<\/span>)<\/span>\r\n=><\/span> #<Author _id: 5df0563221b6205f2062e62d, name: \"Alex\", age: 27><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>author<\/span> =<\/span> author<\/span>\r\n=><\/span> #<Author _id: 5df0563221b6205f2062e62d, name: \"Alex\", age: 27><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> article<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"articles\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5df0561821b6205f2062e62c'), \"title\"=>\"eighth article\", \"author\"=>{\"_id\"=>BSON::ObjectId('5df0563221b6205f2062e62d'), \"name\"=>\"Alex\", \"age\"=>27}}], \"lsid\"=>{\"id\"=><BSON::Bina...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> true<\/span>\r\n<\/code><\/pre>\n
                      \u4e0eembeds_many\u7c7b\u4f3c\u3002<\/p>\n
                      \u603b\u7ed3\u5982\u679c\u5728MongoDB\u4e2d\u5df2\u7ecf\u5b58\u5728\u4e86\u7236\u5143\u7d20\u7684\u6587\u6863\uff0c\u90a3\u4e48\u65e0\u8bba\u662fhas_*\u8fd8\u662fembeds_*\uff0c\u5728\u4e3a\u7236\u5143\u7d20\u5206\u914d\/\u5b58\u50a8\u5b50\u5143\u7d20\u65f6\uff0c\u5c06\u9488\u5bf9\u76f8\u5e94\u7684\u6587\u6863\u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n
                      \u5982\u679c\u7236\u5143\u7d20\u7684\u6587\u6863\u5c1a\u672a\u63d2\u5165\u5230MongoDB\u4e2d\uff0c\u4e14\u5173\u7cfb\u4e3ahas_*\uff0c\u5219\u4fdd\u5b58\u7236\u5143\u7d20\u7684\u6570\u636e\u800c\u4e0d\u4f1a\u4fdd\u5b58\u5b50\u5143\u7d20\uff0c\u9700\u8981\u53e6\u5916\u5355\u72ec\u4fdd\u5b58\u5b50\u5143\u7d20\u3002\u5982\u679c\u5173\u7cfb\u4e3aembeds_*\uff0c\u65e0\u8bba\u4fdd\u5b58\u7236\u5143\u7d20\u8fd8\u662f\u5b50\u5143\u7d20\uff0c\u4e24\u8005\u90fd\u4f1a\u88ab\u4fdd\u5b58\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                      \u5982\u679c\u8981\u5c06\u5176\u6dfb\u52a0\u5230\u73b0\u6709\u6587\u6863\u4e2d \u6709\u8bb8\u591a\u5728\u4ee5\u4e0b\u6a21\u5f0f\u4e0b\u8fdb\u884c\u8003\u8651\u3002 class Article include Mong […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-29688","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nMongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eMongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/mongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eMongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/mongoid\u4f55\u65f6\u53cd\u6620\u5173\u7cfb\u7684\u5b50\u5143\u7d20\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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