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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-12546] Misleading error message &quot;Invalid modifier specified: $set&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-12546</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The error message &lt;tt&gt;Invalid modifier specified: $set&lt;/tt&gt;, at a first glance, suggests that &apos;$set&apos; itself is an invalid modifier. I&apos;m not the only one to read it that way; see also &lt;a href=&quot;http://stackoverflow.com/questions/20200523/node-js-mongo-invalid-modifier-specified-set-undefined#comment30120044_20200523&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this StackOverflow comment&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This happens when (accidentally) running an update() with {$set: null}.&lt;/p&gt;

&lt;p&gt;The message would be less misleading and more useful if it output the precise value of the modifier (not just $set). For example:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;Invalid modifier specified for $set: null&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="108358">SERVER-12546</key>
            <summary>Misleading error message &quot;Invalid modifier specified: $set&quot;</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="dandv">Dan Dascalescu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jan 2014 14:52:22 +0000</created>
                <updated>Thu, 30 Jan 2014 15:37:23 +0000</updated>
                            <resolved>Thu, 30 Jan 2014 15:37:23 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="490806" author="scotthernandez" created="Thu, 30 Jan 2014 15:37:23 +0000"  >&lt;p&gt;In the current code this is no longer the message. Instead you get this;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.coll.update({}, {$set:null})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2014-01-30T10:33:42.792-0500 trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2014-01-30T10:33:42.793-0500 reconnect 127.0.0.1:27017 (127.0.0.1) ok&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...                        &quot;errmsg&quot; : &quot;Modifiers operate on fields but we found a NULL instead. For example: {$mod: {&amp;lt;field&amp;gt;: ...}} not {$set: null}&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This will be avaiable with the 2.5.3+ dev releases and in the 2.6 stable production release when it comes out. If you think this message is not what you want, please make a comment and we can re-open this.&lt;/p&gt;</comment>
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