blocks|key|217675|text|由于本期，您需要使用脚本进行更新|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|217676|使用以下方法更新所有字段：|217677|db.collection.find({
++++_id:+ObjectId("558bbd23fdf0f33ec7a067c8")
}).forEach(function(doc)+{
++++doc.items.forEach(function(items)+{
++++if+(items.hidden+==+true)+{
++++++++items.hidden+=+false;
++++}
++++});
++++db.collection.save(doc);
});|code-block|syntax|javascript|217678|entityMap|0|LINK|mutability|MUTABLE|url|https://jira.mongodb.org/browse/SERVER-1243^0|2|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You need to update using script due to <a href="https://jira.mongodb.org/browse/SERVER-1243" rel="nofollow">this issue</a>

Use following to update all fields:

<pre><code>db.collection.find({
 _id: ObjectId("558bbd23fdf0f33ec7a067c8")
}).forEach(function(doc) {
 doc.items.forEach(function(items) {
 if (items.hidden == true) {
 items.hidden = false;
 }
 });
 db.collection.save(doc);
});
</code></pre>

blocks|key|294879|text|您可以尝试以下更新，它使用游标方法forEach()来迭代游标和访问文档，获取items数组并在其上循环并修改hidden字段，如下面的示例所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|294880|db.test.insert([
++++{
++++++++"_id"+:+1,
++++++++"items"+:+[+
++++++++++++{
++++++++++++++++"_id"+:+1,
++++++++++++++++"hidden"+:+true
++++++++++++},+
++++++++++++{
++++++++++++++++"_id"+:+2,
++++++++++++++++"hidden"+:+true
++++++++++++}
++++++++]
++++},
++++{
++++++++"_id"+:+2,
++++++++"items"+:+[+
++++++++++++{
++++++++++++++++"_id"+:+1,
++++++++++++++++"hidden"+:+true
++++++++++++},+
++++++++++++{
++++++++++++++++"_id"+:+2,
++++++++++++++++"hidden"+:+true
++++++++++++}
++++++++]
++++}
])

db.test.find().forEach(function+(doc){
++++var+items+=+[];
++++doc.items.forEach(function+(item){
++++++++item.hidden+=+false;
++++++++items.push(item);
++++});
++++doc.items+=+items;
++++db.test.save(doc);
});|code-block|syntax|javascript|294881|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.mongodb.org/manual/reference/method/cursor.forEach/#cursor.forEach^0|13|5|1J|6|H|9|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You could try the following update which uses the cursor method <a href="http://docs.mongodb.org/manual/reference/method/cursor.forEach/#cursor.forEach" rel="nofollow"><code>forEach()</code></a> to iterate the cursor and access the documents, get the <code>items</code> array and loop over it and modify the <code>hidden</code> field, as in the following example:

<pre><code>db.test.insert([
 {
 "_id" : 1,
 "items" : [ 
 {
 "_id" : 1,
 "hidden" : true
 }, 
 {
 "_id" : 2,
 "hidden" : true
 }
 ]
 },
 {
 "_id" : 2,
 "items" : [ 
 {
 "_id" : 1,
 "hidden" : true
 }, 
 {
 "_id" : 2,
 "hidden" : true
 }
 ]
 }
])

db.test.find().forEach(function (doc){
 var items = [];
 doc.items.forEach(function (item){
 item.hidden = false;
 items.push(item);
 });
 doc.items = items;
 db.test.save(doc);
});
</code></pre>

blocks|key|294894|text|在整个集合中更新数组中的所有元素并不简单。您必须使用嵌套的forEach。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|294895|位置$运算符充当与查询文档匹配的第一个元素的占位符。|blockquote|294896|请看一下这个讨论。|offset|length|294897|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/22405377/mongodb-update-all-fields-of-array-error^0|0|0|6|2|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|S|8|@]|9|@$G|T|H|U|1|V]]|A|$]]|$1|I|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

Updating all the elements in an array across the whole collection is not simple. You'll have to use nested forEach.

<blockquote>
 The positional $ operator acts as a placeholder for the first element
 that matches the query document
</blockquote>

Please take a look at this <a href="https://stackoverflow.com/questions/22405377/mongodb-update-all-fields-of-array-error">discussion</a>.

I would like to know how to set properties for all nested documents.

Suppose I have a <code>category</code> document that has nested <code>item</code> documents:

<pre><code>{
 items: [
 {
 hidden: true
 },
 {
 hidden: true
 },
 ...
 ]
}
</code></pre>

How can I update all the <code>hidden</code> property of items to <code>false</code>?

I have tried this:

<pre><code>db.categories.update({}, {$set: {'items.$.hidden': false}})
</code></pre>

But MongoDB gives me <code>The positional operator did not find the match needed from the query. Unexpanded update: items.$.hidden</code>. Any suggestions?

$set properties for all nested documents

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想知道如何为所有嵌套文档设置属性。假设我有一个具有嵌套category文档的item文档：{  items: [    {      hidden: true    },    {      hidden: true    },    ...  ]}如何将项的所有hidden属性更新为false我试过这样做：db.c...

问所有嵌套文档的$set属性
EN

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问所有嵌套文档的$set属性EN