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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>
    </build-info>


<item>
            <title>[GODRIVER-2553] docs: cursor.All code in the find API usage example leads users to a Go gotcha in the case of no results (might be bug)</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-2553</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;The &quot;&lt;a href=&quot;https://raw.githubusercontent.com/mongodb/docs-golang/v1.10/source/includes/usage-examples/code-snippets/find.go&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fully runnable example&lt;/a&gt;&quot; from the &lt;a href=&quot;https://www.mongodb.com/docs/drivers/go/current/usage-examples/find/#std-label-golang-find&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Find Multiple Documents&lt;/a&gt; usage example page declares the results slice that is passed to `cursor.All` as&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;   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;var results []bson.M&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;Despite the Go driver API documentation for `cursor.All` saying that the referenced slice will be &quot;completely overwritten&quot;, in the case of no results, `results` will remain in an uninitialized state, which will be encoded as `null` in json (and bson). In contrast, if the results slice is declared as&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;var results []bson.M = make([]bson.M, 0, 0)&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;// or, equivalently&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;results := make([]bson.M, 0, 0)&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;in the case of no results, `results` will be fully initialized, and will be encoded as `[]` (the empty array) in json.&lt;/p&gt;

&lt;p&gt;I am not sure whether this difference in behavior for the empty result set is intentional or avoidable. If it is intentional, then I think we may want to update our documentation to point out this gotcha more clearly (both in driver API docs and the examples page) and/or update our example to use the fully initialized results declaration, so that users who are relying on a consistent data structure, e.g., for returning the response in json format via a REST API, aren&apos;t led into this pitfall.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2144524">GODRIVER-2553</key>
            <summary>docs: cursor.All code in the find API usage example leads users to a Go gotcha in the case of no results (might be bug)</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="qingyang.hu@mongodb.com">Qingyang Hu</assignee>
                                    <reporter username="daria.pardue@mongodb.com">Daria Pardue</reporter>
                        <labels>
                            <label>buildfest-2022</label>
                    </labels>
                <created>Fri, 23 Sep 2022 20:42:52 +0000</created>
                <updated>Thu, 13 Oct 2022 21:01:19 +0000</updated>
                            <resolved>Thu, 13 Oct 2022 21:01:19 +0000</resolved>
                                                                    <component>Docs</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4902256" author="JIRAUSER1268281" created="Thu, 13 Oct 2022 21:01:19 +0000"  >&lt;p&gt;Breaking change. Will fix in the v2.0 driver.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2158859">GODRIVER-2589</issuekey>
        </issuelink>
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