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            <title>[SERVER-1139] Capped Arrays / Limited Stacks - The ability to define a max number of elements in an array</title>
                <link>https://jira.mongodb.org/browse/SERVER-1139</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice to have the ability in one statement to be able to cap the elements in an array to keep a fixed stack size. &lt;/p&gt;

&lt;p&gt;e.g. If I want to store the latest 10 users who have visited a blog post in an array within a document. Currently this requires two operations &lt;/p&gt;

&lt;p&gt;Redis supports things like this with Lists and lpush, ltrim, etc..., it would be handy in mongodb as well.&lt;/p&gt;
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        <key id="11995">SERVER-1139</key>
            <summary>Capped Arrays / Limited Stacks - The ability to define a max number of elements in an array</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="jiminoc">Jim Plush</reporter>
                        <labels>
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                <created>Thu, 20 May 2010 18:56:09 +0000</created>
                <updated>Thu, 3 Jun 2010 11:00:25 +0000</updated>
                            <resolved>Thu, 3 Jun 2010 11:00:25 +0000</resolved>
                                                                                        <votes>4</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="14548" author="andrewk" created="Thu, 3 Jun 2010 10:41:57 +0000"  >&lt;p&gt;just noticed this is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-991&quot; title=&quot;$push with $slice + $sort&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-991&quot;&gt;&lt;del&gt;SERVER-991&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
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