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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-51839] Add error context when document validator with $expr fails by throwing an exception </title>
                <link>https://jira.mongodb.org/browse/SERVER-51839</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The evaluation of an &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/query/expr/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$expr&lt;/tt&gt;&lt;/a&gt; can throw query-fatal exceptions in a variety of conditions, with one classic example being division by zero. When this happens during the evaluation of a &lt;a href=&quot;https://docs.mongodb.com/manual/core/schema-validation/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;collection validator&lt;/a&gt;, the insert or update operation will be rejected by the validator. For example, let&apos;s suppose that we create a collection validator that always divides by zero:&lt;/p&gt;

&lt;p/&gt;
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&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;
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					&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.createCollection(&quot;c&quot;, {validator: {$expr: {$divide: [10, 0]}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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					&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;{ &quot;ok&quot; : 1 }&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; &amp;gt; db.c.insert({})&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;WriteResult({&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;	&quot;nInserted&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;	&quot;writeError&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;		&quot;code&quot; : 16608,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;		&quot;errmsg&quot; : &quot;can&apos;t $divide by zero&quot;&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;	}&lt;/span&gt;&lt;/pre&gt;
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						&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;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The insert is rejected when the system runs the validator to ensure that the write is valid, and the validator itself fails.&lt;/p&gt;

&lt;p&gt;Note, however, that the error message doesn&apos;t indicate that the problem occurred when checking the document validator. We should add context to the error message so that it says something like &quot;Document validation failed :: caused by :: can&apos;t $divide by zero&quot;.&lt;/p&gt;

&lt;p&gt;As an implementation note, we have a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c0b9b346586b4b7c97fde38ea97a98a42da0b572/src/mongo/util/assert_util.h#L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;convenient method for adding context to an exception&lt;/a&gt; before rethrowing it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1525678">SERVER-51839</key>
            <summary>Add error context when document validator with $expr fails by throwing an exception </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="13201">Fixed</resolution>
                                        <assignee username="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 26 Oct 2020 21:28:38 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:32 +0000</updated>
                            <resolved>Thu, 3 Dec 2020 16:20:32 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3514388" author="xgen-internal-githook" created="Thu, 3 Dec 2020 15:29:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51839&quot; title=&quot;Add error context when document validator with $expr fails by throwing an exception &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51839&quot;&gt;&lt;del&gt;SERVER-51839&lt;/del&gt;&lt;/a&gt; Add error context when document validator with $expr fails by throwing an exception&lt;/p&gt;

&lt;p&gt;Document validators which use $expr will now generate detailed errors&lt;br/&gt;
when $expr throws. When the validationAction is set to error, the write&lt;br/&gt;
will fail with a DocumentValidationError instead of the exception&apos;s&lt;br/&gt;
error code. When the validationAction is set to warn, the write will be&lt;br/&gt;
accepted and a detailed error will be logged.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ffd5e7243e27928a1023cce73a5cc4264f7a8e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ffd5e7243e27928a1023cce73a5cc4264f7a8e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3463935" author="david.storch" created="Mon, 26 Oct 2020 21:39:47 +0000"  >&lt;p&gt;Although the change suggested here is a small usability improvement, there is a broader question at play here about whether &lt;tt&gt;$expr&lt;/tt&gt; should throw exceptions at all in the context of document validation. By doing so, it fails to play nicely with&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20547&quot; title=&quot;Expose the reason an operation fails document validation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20547&quot;&gt;&lt;del&gt;SERVER-20547&lt;/del&gt;&lt;/a&gt;, the feature to expose a detailed reason for document validation failure, since the operation is terminated by throwing an exception before we can generate the detailed &lt;tt&gt;errInfo&lt;/tt&gt; object. Perhaps we would configure any&#160;&lt;tt&gt;ExprMatchExpression&lt;/tt&gt; nodes for a collection validator to swallow exceptions and return false rather than propagate exceptions?&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>Document validators which use $expr will now generate detailed errors&lt;br/&gt;
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