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    <title>MongoDB Jira</title>
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    <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>[GODRIVER-1318] Make BSON unmarshaling error if target struct has no exported fields</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-1318</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;We continue to see evidence of confused users who try to unmarshal into a struct like this:&lt;/p&gt;
&lt;p/&gt;
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					&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;type Foo struct {&lt;/span&gt;&lt;/pre&gt;
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						&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;    bar string `bson:&quot;bar&quot;`&lt;/span&gt;&lt;/pre&gt;
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						&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;    baz bool `bson:&quot;baz&quot;`&lt;/span&gt;&lt;/pre&gt;
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					&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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Perhaps we should consider returning an error,&#160;&lt;tt&gt;ErrNoExportedFields&lt;/tt&gt;, if a user tries to unmarshal into such a struct. It deviates from the &lt;tt&gt;json&lt;/tt&gt; package&apos;s behavior, but it does seem like a not-uncommon and very frustrating new user experience, so maybe it&apos;s worth it to get users to realize their error quickly (and avoid them needing to go to SO or the mailing list or Jira to ask what&apos;s wrong).&lt;/p&gt;

&lt;p&gt;By contrast, a struct with mixed exported and unexported fields implies the user is at least thinking about visibility and if they try to unmarshal into that and it doesn&apos;t do what they expect, they probably understand visibility enough to figure it out. (Plus we can&apos;t error in that case the way we can if there are &lt;b&gt;no&lt;/b&gt; exported fields.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="933899">GODRIVER-1318</key>
            <summary>Make BSON unmarshaling error if target struct has no exported fields</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="david.golden@mongodb.com">David Golden</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Sep 2019 23:44:43 +0000</created>
                <updated>Tue, 18 Apr 2023 16:36:24 +0000</updated>
                            <resolved>Tue, 18 Apr 2023 16:36:24 +0000</resolved>
                                                                    <component>BSON</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5304167" author="david.golden" created="Mon, 27 Mar 2023 20:27:21 +0000"  >&lt;p&gt;I don&apos;t think there&apos;s anything other than what we saw in the description.   Non-expert Go users were making mistakes by not exporting any struct fields and it silently does nothing.  If that hasn&apos;t been an issue reported by users since this ticket was filed, feel free to close it.&lt;/p&gt;</comment>
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