回答編集履歴
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```
test
CHANGED
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@@ -1,5 +1,141 @@
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```
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db.teratail.find();
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```
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```
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/* 1 */
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{
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"_id" : ObjectId("5ab75ebd2fbe474420a8fa0a"),
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"name" : "AAA",
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"contents" : [
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{
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"contentsId" : "111",
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"contentsName" : "aaa"
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},
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{
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"contentsId" : "222",
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"contentsName" : "bbb"
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}
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]
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}
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/* 2 */
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{
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"_id" : ObjectId("5ab75ebd2fbe474420a8fa0b"),
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"name" : "BBB",
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"contents" : [
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{
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"contentsId" : "333",
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"contentsName" : "ccc"
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},
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{
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"contentsId" : "444",
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"contentsName" : "ddd"
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}
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]
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}
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```
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```
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db.teratail.update({}, { $pull: { contents: { contentsName: 'bbb' } } })
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db.teratail.find();
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```
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```
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/* 1 */
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{
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"_id" : ObjectId("5ab75ebd2fbe474420a8fa0a"),
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"name" : "AAA",
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"contents" : [
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{
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"contentsId" : "111",
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"contentsName" : "aaa"
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}
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]
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}
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/* 2 */
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{
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"_id" : ObjectId("5ab75ebd2fbe474420a8fa0b"),
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"name" : "BBB",
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"contents" : [
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{
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"contentsId" : "333",
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"contentsName" : "ccc"
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},
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{
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"contentsId" : "444",
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"contentsName" : "ddd"
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}
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]
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}
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140
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```
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