{"id":29675,"date":"2023-04-11T16:21:39","date_gmt":"2023-01-18T23:02:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%bd%e8%b8%aamongoid%e7%9a%84has_one%e5%85%b3%e8%81%94%e7%9a%84%e4%bb%a4%e4%ba%ba%e5%85%b3%e6%b3%a8%e7%9a%84%e8%a1%8c%e4%b8%ba%e3%80%82\/"},"modified":"2025-08-12T15:19:12","modified_gmt":"2025-08-12T07:19:12","slug":"%e8%bf%bd%e8%b8%aamongoid%e7%9a%84has_one%e5%85%b3%e8%81%94%e7%9a%84%e4%bb%a4%e4%ba%ba%e5%85%b3%e6%b3%a8%e7%9a%84%e8%a1%8c%e4%b8%ba%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%bd%e8%b8%aamongoid%e7%9a%84has_one%e5%85%b3%e8%81%94%e7%9a%84%e4%bb%a4%e4%ba%ba%e5%85%b3%e6%b3%a8%e7%9a%84%e8%a1%8c%e4%b8%ba%e3%80%82\/","title":{"rendered":"\u8ffd\u8e2aMongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a"},"content":{"rendered":"

\u5728\u4e0b\u9762\u7684\u6a21\u578b\u4e2d\u8fdb\u884c\u9a8c\u8bc1\u3002
\n\uff08\u867d\u7136\u6211\u89c9\u5f97\u6bcf\u4e2a\u9879\u76ee\u6709\u4e00\u4e2a\u6240\u6709\u8005\u7684\u5173\u7cfb\u6709\u4e9b\u5fae\u5999\uff0c\u4f46\u5728\u8fd9\u91cc\u6211\u4eec\u5c06\u5176\u7f6e\u4e4b\u4e0d\u7406\uff09\u3002<\/p>\n

class<\/span> Item<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :name<\/span>\r\n\r\n  has_one<\/span> :owner<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
class<\/span> Owner<\/span>\r\n  include<\/span> Mongoid<\/span>::<\/span>Document<\/span>\r\n\r\n  field<\/span> :name<\/span>\r\n\r\n  belongs_to<\/span> :item<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u6570\u636e\u51c6\u5907\u4e00\u4efd\u7269\u54c1\u548c\u4e00\u4e2a\u62e5\u6709\u8005\uff0c\u7136\u540e\u8bbe\u7f6e\u5173\u8054\u5173\u7cfb\u3002<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> item<\/span> =<\/span> Item<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'item01'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"items\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334'), \"name\"=>\"item01\"}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3144df...>}}<\/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> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span> =<\/span> Owner<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'John'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"owners\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5df7ad4821b6205247b04335'), \"name\"=>\"John\", \"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3...<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>insert<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.027<\/span>s<\/span>\r\n=><\/span> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
\u5728mongo shell\u4e2d\uff0c\u5b83\u770b\u8d77\u6765\u5982\u4e0b\u3002<\/p>\n
><\/span> db<\/span>.<\/span>items<\/span>.<\/span>find<\/span>()<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad2c21b6205247b04334<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>item01<\/span>\"<\/span> }<\/span>\r\n><\/span> db<\/span>.<\/span>owners<\/span>.<\/span>find<\/span>()<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad4821b6205247b04335<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>John<\/span>\"<\/span>,<\/span> \"<\/span>item_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad2c21b6205247b04334<\/span>\"<\/span>)<\/span> }<\/span>\r\n<\/code><\/pre>\n
\u66f4\u6362\u6240\u6709\u8005
\n\u6dfb\u52a0\u4e00\u4e2a\u6240\u6709\u8005\uff0c\u5e76\u5c06\u5148\u524d\u521b\u5efa\u7684\u7269\u54c1\u7684\u6240\u6709\u8005\u66f4\u6539\u4e3a\u65b0\u521b\u5efa\u7684\u6240\u6709\u8005\u3002<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span> =<\/span> Owner<\/span>.<\/span>create<\/span>(<\/span>name: <\/span>'Tom'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"owners\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5df7ae8721b6205247b04336'), \"name\"=>\"Tom\", \"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b31...<\/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> #<Owner _id: 5df7ae8721b6205247b04336, name: \"Tom\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u79cd\u72b6\u6001\u4e0b\uff0c\u5982\u679c\u901a\u8fc7mongo shell\u6765\u67e5\u770b\u6570\u636e\uff0c\u770b\u8d77\u6765\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
><\/span> db<\/span>.<\/span>items<\/span>.<\/span>find<\/span>()<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad2c21b6205247b04334<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>item01<\/span>\"<\/span> }<\/span>\r\n><\/span> db<\/span>.<\/span>owners<\/span>.<\/span>find<\/span>()<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad4821b6205247b04335<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>John<\/span>\"<\/span>,<\/span> \"<\/span>item_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad2c21b6205247b04334<\/span>\"<\/span>)<\/span> }<\/span>\r\n{<\/span> \"<\/span>_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ae8721b6205247b04336<\/span>\"<\/span>),<\/span> \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>Tom<\/span>\"<\/span>,<\/span> \"<\/span>item_id<\/span>\"<\/span> :<\/span> ObjectId<\/span>(<\/span>\"<\/span>5df7ad2c21b6205247b04334<\/span>\"<\/span>)<\/span> }<\/span>\r\n<\/code><\/pre>\n
\u4f60\u660e\u767d\u4e86\u5417\uff1f\u65b0\u65e7\u4e24\u4e2a\u6240\u6709\u8005\u90fd\u62e5\u6709\u76f8\u540c\u7684item_id\u3002<\/p>\n
\u786e\u8ba4\u7269\u54c1\u7684\u6240\u6709\u8005<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> item<\/span>\r\n=><\/span> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>005<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>\r\n=><\/span> #<Owner _id: 5df7ae8721b6205247b04336, name: \"Tom\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>006<\/span>:<\/span>0<\/span>><\/span> suspected_item<\/span> =<\/span> Item<\/span>.<\/span>find_by<\/span>(<\/span>name: <\/span>'item01'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"name\"=>\"item01\"}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3144df...>}}<\/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> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>007<\/span>:<\/span>0<\/span>><\/span> suspected_item<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3144df...>}}<\/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> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
\u5728\u8bbe\u7f6e owner \u65f6\u4f7f\u7528\u7684\u53d8\u91cf item \u548c\u901a\u8fc7 find_by \u65b0\u83b7\u5f97\u7684 suspected_item \u5f15\u7528\u4e86\u540c\u4e00\u4e2a\u6587\u6863\u3002
\n\u7136\u800c\uff0csuspected_item \u7684 owner \u4ecd\u5904\u4e8e\u66f4\u65b0\u524d\u7684\u72b6\u6001\u3002<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>8<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>id<\/span> ==<\/span> suspected_item<\/span>.<\/span>id<\/span>\r\n=><\/span> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>00<\/span>9<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>.<\/span>id<\/span> ==<\/span> suspected_item<\/span>.<\/span>owner<\/span>.<\/span>id<\/span>\r\n=><\/span> false<\/span>\r\n<\/code><\/pre>\n
\u5bf9\u6bd4\u7269\u54c1\u548c\u6240\u6709\u8005\u7684ID\u7684\u7ed3\u679c\u4e5f\u76f8\u540c\u3002<\/p>\n
\u901a\u8fc7\u91cd\u65b0\u52a0\u8f7d\u9879\u76ee\u6765\u89e3\u51b3\u6b64\u4e0d\u4e00\u81f4\u3002<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>010<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>reload<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>12<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3144df...>}}<\/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> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>011<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>13<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200973173640 type=uuid data=0x2bf6fc2b4b3144df...>}}<\/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> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
\u6982\u62ec\u4e00\u4e0b
\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u5982\u679c\u5728\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u4e0d\u662f\u66f4\u65b0has_one\u5173\u8054\u5bf9\u8c61\u800c\u662f\u8fdb\u884c\u4e86\u66f4\u6362\u64cd\u4f5c\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u4e00\u81f4\u60c5\u51b5\u53d1\u751f\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u95ee\u9898\u7684\u73b0\u8c61\u53ef\u4ee5\u8868\u8fbe\u5982\u4e0b\uff1a<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> item<\/span> =<\/span> Item<\/span>.<\/span>find_by<\/span>(<\/span>name: <\/span>'item01'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"name\"=>\"item01\"}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200374997080 type=uuid data=0xa133eef4e6bd4947...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.003<\/span>s<\/span>\r\n=><\/span> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200374997080 type=uuid data=0xa133eef4e6bd4947...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span> =<\/span> Owner<\/span>.<\/span>new<\/span>(<\/span>name: <\/span>'Ken'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.insert | STARTED | {\"insert\"=>\"owners\", \"ordered\"=>true, \"documents\"=>[{\"_id\"=>BSON::ObjectId('5df7b22921b6208637b04334'), \"name\"=>\"Ken\", \"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70200374997080 type=uuid data=0xa133eef4e6bd...<\/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> #<Owner _id: 5df7b22921b6208637b04334, name: \"Ken\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>\r\n=><\/span> #<Owner _id: 5df7b22921b6208637b04334, name: \"Ken\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>005<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>reload<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200374997080 type=uuid data=0xa133eef4e6bd4947...>}}<\/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\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200374997080 type=uuid data=0xa133eef4e6bd4947...>}}<\/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> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
\u7269\u54c1\u7684\u6240\u6709\u8005\u5e94\u8be5\u4ece\u7ea6\u7ff0\u53d8\u4e3a\u80af\uff0c\u4f46\u4f3c\u4e4e\u53c8\u6062\u590d\u56de\u539f\u6765\u7684\u72b6\u6001\u3002<\/p>\n
\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5
\n\u57fa\u672c\u4e0a\uff0c\u5c0d\u65bc has_one \u7684\u5c0d\u8c61\uff0c\u6700\u597d\u7684\u505a\u6cd5\u4e0d\u662f\u5132\u5b58\u53e6\u4e00\u500b\u6587\u4ef6\uff0c\u800c\u662f\u4fee\u6539\u73fe\u6709\u7684\u6587\u4ef6\u3002
\n\u63db\u53e5\u8a71\u8aaa\uff0c\u61c9\u8a72\u9019\u6a23\u505a\uff1a<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>001<\/span>:<\/span>0<\/span>><\/span> item<\/span> =<\/span> Item<\/span>.<\/span>find_by<\/span>(<\/span>name: <\/span>'item01'<\/span>)<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"name\"=>\"item01\"}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200373471320 type=uuid data=0x138828941f17407c...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>7<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.002<\/span>s<\/span>\r\n=><\/span> #<Item _id: 5df7ad2c21b6205247b04334, name: \"item01\"><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>002<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>8<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200373471320 type=uuid data=0x138828941f17407c...>}}<\/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> #<Owner _id: 5df7ad4821b6205247b04335, name: \"John\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>003<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>.<\/span>name<\/span> =<\/span> 'Tom'<\/span>\r\n=><\/span> \"Tom\"<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>004<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>owner<\/span>.<\/span>save<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.update | STARTED | {\"update\"=>\"owners\", \"ordered\"=>true, \"updates\"=>[{\"q\"=>{\"_id\"=>BSON::ObjectId('5df7ad4821b6205247b04335')}, \"u\"=>{\"$set\"=>{\"name\"=>\"Tom\"}}}], \"lsid\"=>{\"id\"=><BSON::Binary:0x70200373471320 type=uuid data=0x138828941f17407c...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>9<\/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> true<\/span>\r\nirb<\/span>(<\/span>main<\/span>):<\/span>005<\/span>:<\/span>0<\/span>><\/span> item<\/span>.<\/span>reload<\/span>.<\/span>owner<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>10<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"items\", \"filter\"=>{\"_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200373471320 type=uuid data=0x138828941f17407c...>}}<\/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\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> #1 | sandbox.find | STARTED | {\"find\"=>\"owners\", \"filter\"=>{\"item_id\"=>BSON::ObjectId('5df7ad2c21b6205247b04334')}, \"limit\"=>1, \"singleBatch\"=>true, \"lsid\"=>{\"id\"=><BSON::Binary:0x70200373471320 type=uuid data=0x138828941f17407c...>}}<\/span>\r\nMONGODB<\/span> |<\/span> [<\/span>11<\/span>]<\/span> localhost<\/span>:<\/span>28001<\/span> |<\/span> sandbox<\/span>.<\/span>find<\/span> |<\/span> SUCCEEDED<\/span> |<\/span> 0.001<\/span>s<\/span>\r\n=><\/span> #<Owner _id: 5df7ad4821b6205247b04335, name: \"Tom\", item_id: BSON::ObjectId('5df7ad2c21b6205247b04334')><\/span>\r\n<\/code><\/pre>\n
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\u5982\u679c\u6570\u636e\u7ed3\u6784\u7684\u8bbe\u8ba1\u53ef\u4ee5\u505a\u5f97\u5f88\u597d\uff0c\u6211\u89c9\u5f97\u53ef\u4ee5\u901a\u8fc7\u7ed9\u8fd9\u4e2a\u5173\u7cfb\u4e2d\u6240\u6709\u8005\u62e5\u6709\u7684item_id\u52a0\u4e0a\u552f\u4e00\u7d22\u5f15\u6765\u907f\u514d\u51b2\u7a81\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u4e0b\u9762\u7684\u6a21\u578b\u4e2d\u8fdb\u884c\u9a8c\u8bc1\u3002 \uff08\u867d\u7136\u6211\u89c9\u5f97\u6bcf\u4e2a\u9879\u76ee\u6709\u4e00\u4e2a\u6240\u6709\u8005\u7684\u5173\u7cfb\u6709\u4e9b\u5fae\u5999\uff0c\u4f46\u5728\u8fd9\u91cc\u6211\u4eec\u5c06\u5176\u7f6e\u4e4b\u4e0d\u7406\uff09\u3002 cla […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-29675","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u8ffd\u8e2aMongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u8ffd\u8e2aMongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a\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\/\u8ffd\u8e2amongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8ffd\u8e2aMongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u8ffd\u8e2aMongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8ffd\u8e2amongoid\u7684has_one\u5173\u8054\u7684\u4ee4\u4eba\u5173\u6ce8\u7684\u884c\u4e3a\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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