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            <title>[DOCS-9649] Comment on: &quot;manual/faq/fundamentals.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-9649</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;    Previously official mongodb documentation instructed developers to replace &quot;.&quot; (dot) and &quot;$&quot; (dollar sign) in user supplied input with unicode equivalents.  This was relevant for update() and where() queries, to prevent &quot;NoSQL Injection&quot;.  I can no longer find this section of the mongodb docs.  I now see that there is instead a section describing constructing a BSON object representing the query, using a mongodb client library.  Is the previous explanation of replacing &quot;$&quot; and &quot;.&quot; with unicode equivalents not necessary because if the query is constructed by formatting a BSON object special characters are escaped?  How is this different from passing a JSON object to the query function?  To the best of my knowledge creating BSON objects has been supported by client libraries for some time, was the old strategy simply inferior and so it has been removed, or did something change?  Thank you for the support!&lt;/p&gt;
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*Location*: &lt;a href=&quot;https://docs.mongodb.com/manual/faq/fundamentals/#faq-dollar-sign-escaping&quot;&gt;https://docs.mongodb.com/manual/faq/fundamentals/#faq-dollar-sign-escaping&lt;/a&gt;&lt;br/&gt;
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*Referrer*: &lt;a href=&quot;https://github.com/scitran/core/issues/134&quot;&gt;https://github.com/scitran/core/issues/134&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1920 x 1080&lt;br/&gt;
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        <key id="338705">DOCS-9649</key>
            <summary>Comment on: &quot;manual/faq/fundamentals.txt&quot;</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="lwcolton@gmail.com">colton leekley-winslow</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
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                <created>Wed, 14 Dec 2016 04:04:23 +0000</created>
                <updated>Thu, 26 Jul 2018 03:09:27 +0000</updated>
                            <resolved>Thu, 14 Dec 2017 20:23:50 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1752403" author="kay.kim@10gen.com" created="Thu, 14 Dec 2017 20:23:50 +0000"  >&lt;p&gt;I believe the comment should address the question.  Feel free to reopen/create a new ticket.&lt;/p&gt;</comment>
                            <comment id="1457158" author="kay.kim@10gen.com" created="Wed, 14 Dec 2016 04:41:31 +0000"  >&lt;p&gt;Hi Colton &amp;#8211; &lt;br/&gt;
If I remember correctly, I believe we removed because updates in MongogDB no longer support saving field names that contain a dot (.) or a field name that starts with a dollar sign ($).  &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/2.6-compatibility/#updates-enforce-field-name-restrictions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/release-notes/2.6-compatibility/#updates-enforce-field-name-restrictions&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So, it was just a bit of housekeeping by the docs team.&lt;/p&gt;</comment>
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