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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-1247] comparing ObjectId equality fails in map_reduce</title>
                <link>https://jira.mongodb.org/browse/SERVER-1247</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I had a case where I wanted to compare ObjectId instances as part of a map_reduce and it was failing because checking for equality on two ObjectId instances that should have been the same aren&apos;t detected as being the same.&lt;/p&gt;

&lt;p&gt;Sample Python program (showing nothing was emit()&apos;ed from map function, even though there should have been:&lt;br/&gt;
import pymongo&lt;/p&gt;

&lt;p&gt;MAP = &quot;&quot;&quot;&lt;br/&gt;
    function() {&lt;br/&gt;
        for (i=0; i &amp;lt; this.all.length; i++) {&lt;br/&gt;
            if (this.single == this.all&lt;span class=&quot;error&quot;&gt;&amp;#91;i&amp;#93;&lt;/span&gt;) &lt;/p&gt;
{
                emit(this._id, 1);
            }
&lt;p&gt;        }&lt;br/&gt;
    }&quot;&quot;&quot;&lt;br/&gt;
RED = &quot;function(k,v) &lt;/p&gt;
{ return 1; }
&lt;p&gt;&quot;&lt;/p&gt;

&lt;p&gt;dbc=pymongo.Connection(); db=dbc.test&lt;/p&gt;

&lt;p&gt;oids = []&lt;/p&gt;

&lt;p&gt;c1 = db.entries_with_ids&lt;br/&gt;
c1.remove()&lt;br/&gt;
oids.append(c1.save(&lt;/p&gt;
{&apos;x&apos;:1}
&lt;p&gt;))&lt;br/&gt;
oids.append(c1.save(&lt;/p&gt;
{&apos;x&apos;:2}
&lt;p&gt;))&lt;/p&gt;

&lt;p&gt;c2 = db.mr_test&lt;br/&gt;
c2.remove()&lt;br/&gt;
c2.save(&lt;/p&gt;
{&apos;single&apos;:oids[0], &apos;all&apos;:oids}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;c3 = c2.map_reduce(pymongo.code.Code(MAP), pymongo.code.Code(RED))&lt;/p&gt;

&lt;p&gt;print c2.find_one()&lt;br/&gt;
print &apos;result size&apos;,c3.count()&lt;/p&gt;

&lt;hr /&gt;
&lt;p&gt;Sample output:&lt;/p&gt;
{u&apos;single&apos;: ObjectId(&apos;4c1a478603eba73620000000&apos;), u&apos;_id&apos;: ObjectId(&apos;4c1a478603eba73620000002&apos;), u&apos;all&apos;: [ObjectId(&apos;4c1a478603eba73620000000&apos;), ObjectId(&apos;4c1a478603eba73620000001&apos;)]}
&lt;p&gt;result size 0&lt;/p&gt;</description>
                <environment>pymongo 1.6, MongoDB 1.4.3.  Single server, Ubuntu 9.10.</environment>
        <key id="12173">SERVER-1247</key>
            <summary>comparing ObjectId equality fails in map_reduce</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="shearic">Richard Shea</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Jun 2010 12:12:30 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:38 +0000</updated>
                            <resolved>Wed, 23 Jun 2010 10:02:45 +0000</resolved>
                                                    <fixVersion>1.5.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="15006" author="eliot" created="Wed, 23 Jun 2010 10:02:45 +0000"  >&lt;p&gt;You can&apos;t overload == in js, but I did add a .equals method which should work.&lt;/p&gt;</comment>
                            <comment id="15005" author="auto" created="Wed, 23 Jun 2010 10:02:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: ObejctId.equals &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1247&quot; title=&quot;comparing ObjectId equality fails in map_reduce&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1247&quot;&gt;&lt;del&gt;SERVER-1247&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/1dc2b9cd17ecae64205ea6e8ad365def7848cdb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/1dc2b9cd17ecae64205ea6e8ad365def7848cdb0&lt;/a&gt;&lt;/p&gt;</comment>
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