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    <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>[SERVER-1199] Iterating through a query result and adding new data to the queried objects results in iterating over some objects twice</title>
                <link>https://jira.mongodb.org/browse/SERVER-1199</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Iterating through a resultset and adding news fields to the objects results in a corrupted iterator.&lt;/p&gt;

&lt;p&gt;A simple test like the following code iterates many times over the same objects ... am I missing something? (see the attached file for a complete example)&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;
	&lt;ol&gt;
		&lt;li&gt;sample code ##&lt;br/&gt;
total_obj = db.test.find().count()&lt;br/&gt;
count = 0&lt;br/&gt;
for item in db.test.find():&lt;br/&gt;
    db.test.update(
{&apos;_id&apos;:_id}
&lt;p&gt;, {&apos;$set&apos; : {&apos;some_new_data&apos; : random.randint(0, 1000)}})&lt;br/&gt;
    count = count +1&lt;/p&gt;&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;print count,total_obj&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;
	&lt;ol&gt;
		&lt;li&gt;/sample code ##&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;script usage:&lt;br/&gt;
python mongo_find_and_update.py test_db&lt;/p&gt;</description>
                <environment>GNU/Linux Ubuntu (Lucid) mongodb-unstable package (version 20100604) </environment>
        <key id="12087">SERVER-1199</key>
            <summary>Iterating through a query result and adding new data to the queried objects results in iterating over some objects twice</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="alain">Alan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Jun 2010 07:48:29 +0000</created>
                <updated>Fri, 7 Mar 2014 00:18:43 +0000</updated>
                            <resolved>Mon, 7 Jun 2010 16:34:29 +0000</resolved>
                                                                    <component>Querying</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="14611" author="eliot" created="Mon, 7 Jun 2010 22:10:00 +0000"  >&lt;p&gt;Your adding a field using $set, so that will make the object larger forcing a move.&lt;/p&gt;</comment>
                            <comment id="14609" author="alain" created="Mon, 7 Jun 2010 17:56:54 +0000"  >&lt;p&gt;thanks for your answer ... but from what I understand from the documentation, modifying objects should be fine as long as the &apos;_id&apos; is not modified and the size of the returned documents is not affected by the update (this is the case in my example) ... am I wrong?&lt;/p&gt;</comment>
                            <comment id="14608" author="eliot" created="Mon, 7 Jun 2010 16:34:29 +0000"  >&lt;p&gt;this is known/expected behavior&lt;br/&gt;
see &lt;a href=&quot;http://www.mongodb.org/display/DOCS/How+to+do+Snapshotted+Queries+in+the+Mongo+Database&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/How+to+do+Snapshotted+Queries+in+the+Mongo+Database&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="10233" name="mongo_find_and_update.py" size="1529" author="alain" created="Mon, 7 Jun 2010 07:48:29 +0000"/>
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