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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-24048] Value missing in case of Duplicate Field Name Insertion </title>
                <link>https://jira.mongodb.org/browse/SERVER-24048</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have inserted a document with duplicate field name. While find, it is not giving both field. it is giving the last field only. This may mislead to the developers. If it is not giving the both fields then it should not allow to insert duplicate fields.&lt;/p&gt;

&lt;p&gt;db.myCol.insert(&lt;/p&gt;
{visitor_id:1,name:&quot;hello&quot;,name:&quot;hello1&quot;}
&lt;p&gt;) &lt;br/&gt;
Query1-&lt;br/&gt;
db.myCol.find(&lt;/p&gt;
{visitor_id:1}
&lt;p&gt;)&lt;br/&gt;
result-- &lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;572a2b7052c7b442f853c135&quot;), &quot;visitor_id&quot; : 1, &quot;name&quot; : &quot;hello1&quot; }
&lt;p&gt;Query2-db.myCol.find(&lt;/p&gt;
{visitor_id:1,name:&quot;hello&quot;}
&lt;p&gt;)&lt;br/&gt;
result--&lt;br/&gt;
None&lt;br/&gt;
Query3- db.myCol.find(&lt;/p&gt;
{visitor_id:1,name:&quot;hello1&quot;}
&lt;p&gt;)&lt;br/&gt;
result--&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;572a2b7052c7b442f853c135&quot;),&quot;visitor_id&quot; : 1, &quot;name&quot; : &quot;hello1&quot; }

&lt;p&gt;So in either of the query only last field(from duplicate) appears. Why is it not showing both the fields?&lt;/p&gt;</description>
                <environment></environment>
        <key id="284478">SERVER-24048</key>
            <summary>Value missing in case of Duplicate Field Name Insertion </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="2k.pravin@gmail.com">pravin dwiwedi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 May 2016 18:02:29 +0000</created>
                <updated>Wed, 4 May 2016 18:36:46 +0000</updated>
                            <resolved>Wed, 4 May 2016 18:36:46 +0000</resolved>
                                    <version>3.3.4</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1255216" author="thomas.schubert" created="Wed, 4 May 2016 18:36:46 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=2k.pravin%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;2k.pravin@gmail.com&quot;&gt;2k.pravin@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. This is expected behavior, and is a result of how javascript objects/dicts work:&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; x = {a:2, a: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;   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;{a:1}&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;You cannot have repeated fields of the same name at the same level. For additional information please see mozilla&apos;s documentation on &lt;a href=&quot;https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#Duplicate_property_names&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;duplicate property names&lt;/a&gt;. As a result of this behavior, only the second property is inserted into the MongoDB server, which explains the output you observe.&lt;/p&gt;

&lt;p&gt;Please note that the way duplicate field names are handled differs depending on the driver used, please review &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6439&quot; title=&quot;Duplicate fields at the same level should not be allowed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6439&quot;&gt;SERVER-6439&lt;/a&gt; for more information.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="44118">SERVER-6439</issuekey>
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{visitor_id:1,name:&quot;hello&quot;,name:&quot;hello1&quot;}
&lt;p&gt;) &lt;br/&gt;
Step2- db.myCol.find(&lt;/p&gt;
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