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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>[SERVER-3210] Fields dropped when using update with $set</title>
                <link>https://jira.mongodb.org/browse/SERVER-3210</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Certain key values are lost with no warning when using $set to update a document. The following snippet illustrates:&lt;/p&gt;

&lt;p&gt;import pymongo&lt;/p&gt;

&lt;p&gt;document = {}&lt;br/&gt;
for x in range(3000):&lt;br/&gt;
  document&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;#39;%04X&amp;#39; % x&amp;#93;&lt;/span&gt; = &quot;Hello&quot;&lt;/p&gt;

&lt;p&gt;collection = pymongo.Connection().test_db.data&lt;br/&gt;
spec = dict(_id = &quot;unique_id&quot;)&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Make sure document is empty&lt;br/&gt;
collection.remove(spec)&lt;/li&gt;
&lt;/ol&gt;


&lt;ol&gt;
	&lt;li&gt;Make a new document&lt;br/&gt;
collection.save(spec)&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;print &quot;Length of document %s&quot; % len(document)&lt;/p&gt;

&lt;p&gt;collection.update(spec, &lt;/p&gt;
{&quot;$set&quot;: document}
&lt;p&gt;, upsert=False, safe=True)&lt;/p&gt;

&lt;p&gt;result = collection.find_one(spec)&lt;br/&gt;
print &quot;Length of stored data %s&quot; % len(result)&lt;/p&gt;

&lt;p&gt;for key in document:&lt;br/&gt;
  if key not in result:&lt;br/&gt;
    print &quot;Key %s is missing&quot; % key&lt;/p&gt;


&lt;p&gt;This is the output&lt;/p&gt;

&lt;p&gt;Length of document 3000&lt;br/&gt;
Length of stored data 2981&lt;br/&gt;
Key 00A7 is missing&lt;br/&gt;
Key 00A6 is missing&lt;br/&gt;
Key 00A5 is missing&lt;br/&gt;
Key 00A4 is missing&lt;br/&gt;
Key 00A3 is missing&lt;br/&gt;
Key 00A2 is missing&lt;br/&gt;
Key 00A1 is missing&lt;br/&gt;
Key 00A0 is missing&lt;br/&gt;
Key 00A9 is missing&lt;br/&gt;
Key 00A8 is missing&lt;br/&gt;
Key 00B2 is missing&lt;br/&gt;
Key 00B3 is missing&lt;br/&gt;
Key 00B0 is missing&lt;br/&gt;
Key 00B1 is missing&lt;br/&gt;
Key 00B6 is missing&lt;br/&gt;
Key 00B7 is missing&lt;br/&gt;
Key 00B4 is missing&lt;br/&gt;
Key 00B5 is missing&lt;br/&gt;
Key 00B8 is missing&lt;br/&gt;
Key 00B9 is missing&lt;/p&gt;


&lt;p&gt;Changing the formatter from %04X to %04d seems to bypass the issue. So there is something about a pattern in the text.&lt;/p&gt;</description>
                <environment>Ubuntu lucid deb from website, db version v1.8.1, pdfile version 4.5&lt;br/&gt;
Mon Jun  6 22:06:15 git version: a429cd4f535b2499cc4130b06ff7c26f41c00f04&lt;br/&gt;
</environment>
        <key id="17967">SERVER-3210</key>
            <summary>Fields dropped when using update with $set</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="scudette">Michael Cohen</reporter>
                        <labels>
                            <label>insert</label>
                    </labels>
                <created>Mon, 6 Jun 2011 20:11:57 +0000</created>
                <updated>Fri, 7 Mar 2014 00:06:43 +0000</updated>
                            <resolved>Sat, 3 Sep 2011 05:15:41 +0000</resolved>
                                    <version>1.8.1</version>
                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="52341" author="eliot" created="Sat, 3 Sep 2011 05:15:41 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3218&quot; title=&quot;when i update a object, if a key not in object it should insert a new key, but  i fact my existsing key are replaced by key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3218&quot;&gt;&lt;del&gt;SERVER-3218&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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