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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-1561] Does mongod create an ObjectId for a missing _id field or not?</title>
                <link>https://jira.mongodb.org/browse/DOCS-1561</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;First there&apos;s: &quot;the mongod adds the _id field and generates a unique ObjectId to assign as its value.&quot; but later in the *&lt;b&gt;Important&lt;/b&gt;* note there is this:&lt;/p&gt;

&lt;p&gt;&quot;Clock skew between clients can also result in non-strict ordering even for values, because client drivers generate ObjectId values, &lt;b&gt;not the mongod process&lt;/b&gt;.&quot;&lt;/p&gt;

&lt;p&gt;Which is it?  Is it the case that the client driver could create an _id field with a local ObjectId, but if it didn&apos;t then the &lt;tt&gt;mongod&lt;/tt&gt; creates it?&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/object-id/&quot;&gt;http://docs.mongodb.org/manual/reference/object-id/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.93 Safari/537.36&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: reference/object-id&lt;br/&gt;
</environment>
        <key id="77672">DOCS-1561</key>
            <summary>Does mongod create an ObjectId for a missing _id field or not?</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="epc">Ed Costello</reporter>
                        <labels>
                            <label>newwriter</label>
                    </labels>
                <created>Mon, 3 Jun 2013 16:39:28 +0000</created>
                <updated>Fri, 3 Nov 2017 11:23:22 +0000</updated>
                            <resolved>Wed, 3 Jul 2013 15:18:08 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="373435" author="auto" created="Wed, 3 Jul 2013 15:17:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1561&quot; title=&quot;Does mongod create an ObjectId for a missing _id field or not?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1561&quot;&gt;&lt;del&gt;DOCS-1561&lt;/del&gt;&lt;/a&gt;: adding clarification about automatic generation of object ids.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/22d0393c163d281524ddc2d97b4f4fea451a721b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/22d0393c163d281524ddc2d97b4f4fea451a721b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="373434" author="auto" created="Wed, 3 Jul 2013 15:17:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1561&quot; title=&quot;Does mongod create an ObjectId for a missing _id field or not?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1561&quot;&gt;&lt;del&gt;DOCS-1561&lt;/del&gt;&lt;/a&gt;: adding clarification about automatic generation of object ids.&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7be1c01abaefd50f54d300f18a1ef8a1380e49c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7be1c01abaefd50f54d300f18a1ef8a1380e49c2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="352101" author="samk" created="Tue, 4 Jun 2013 02:14:57 +0000"  >&lt;p&gt;Agreed. Will revise...&lt;/p&gt;</comment>
                            <comment id="352087" author="epc" created="Tue, 4 Jun 2013 01:35:06 +0000"  >&lt;p&gt;I agree that it&apos;s technically accurate but think it could be clearer.&lt;/p&gt;</comment>
                            <comment id="351713" author="scotthernandez" created="Mon, 3 Jun 2013 16:56:05 +0000"  >&lt;p&gt;Yes, the server creates it if the client doesn&apos;t. But in almost all cases the client should be creating it.&lt;/p&gt;

&lt;p&gt;The docs read good to me.&lt;/p&gt;</comment>
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