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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-2403] _genIndexName might create duplicated &quot;_&quot; in a generated index name</title>
                <link>https://jira.mongodb.org/browse/SERVER-2403</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;DBCollection.prototype._genIndexName generates index name automatically if it is not supplied.&lt;br/&gt;
It concatenates keys and direction. For example, &lt;/p&gt;
{field1: 1, field2: -1, field3: 1}
&lt;p&gt; results with field1_1_field2_-1_field3_1&lt;br/&gt;
If instead of direction with have a string (2d) we might have duplicate &quot;&lt;em&gt;&quot; or unneeded &quot;&lt;/em&gt;&quot; at the end.&lt;br/&gt;
Example 1:&lt;/p&gt;
{field1: 1, field2: &quot;2d&quot;}
&lt;p&gt;&quot;field1_1_field2_&quot;&lt;/p&gt;

&lt;p&gt;Example2:&lt;/p&gt;
{field1: 1, field2: &quot;2d&quot;, field3: -1}
&lt;p&gt;&quot;field1_1_field2_&lt;em&gt;field3&lt;/em&gt;-1&quot;&lt;/p&gt;

&lt;p&gt;It&apos;s not a big deal but other drivers might implement it in a different way&lt;br/&gt;
and the duplicated &quot;_&quot; might cause a confusion.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/shell/collection.js#L218&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/shell/collection.js#L218&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Fix:&lt;br/&gt;
DBCollection.prototype._genIndexName = function( keys ){&lt;br/&gt;
    var name = &quot;&quot;;&lt;br/&gt;
    for ( var k in keys )&lt;/p&gt;
{
        var v = keys[k];
        if ( typeof v == &quot;function&quot; )
            continue;
        
        if ( name.length &amp;gt; 0 )
            name += &quot;_&quot;;
        //name += k + &quot;_&quot;;         // -------------

        if ( typeof v == &quot;number&quot; )
            //name += v;             // ---------------
            name += &quot;_&quot; + v;     // +++++++++
    }
&lt;p&gt;    return name;&lt;br/&gt;
}&lt;/p&gt;</description>
                <environment></environment>
        <key id="14297">SERVER-2403</key>
            <summary>_genIndexName might create duplicated &quot;_&quot; in a generated index name</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="pablo">pablo platt</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Jan 2011 21:22:48 +0000</created>
                <updated>Sat, 3 Sep 2011 14:40:09 +0000</updated>
                            <resolved>Sat, 3 Sep 2011 14:40:08 +0000</resolved>
                                    <version>1.6.5</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="52380" author="eliot" created="Sat, 3 Sep 2011 14:40:09 +0000"  >&lt;p&gt;We&apos;ll be getting rid of index name soon, so this won&apos;t be needed&lt;/p&gt;</comment>
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