<pre><code>type User struct {
Bio string
Website string
}
</code></pre>
<p>Assume a JSON request that's attempting to update the user's Bio to be blank:</p>
<pre><code>{
"bio":""
}
</code></pre>
<p>But, both <code>bio</code> and <code>website</code> are equal to <code>""</code>, so it seems difficult to detect if the empty string state is a requested change or not.</p>
<p>One possibility would be to use a defined string as an indication to delete:</p>
<pre><code>{
"bio":"[delete]"
}
if request.Bio == "[delete]" {
request.Bio = ""
}
</code></pre>
<p>Is that how people are handling this?</p>
<hr/>**评论：**<br/><br/>GentooMonk: <pre><p>You can use *string</p>
<p>if req.Bio != nil { bio := *req.Bio } </p></pre>icholy: <pre><p>Add json tags with <code>omitempty</code></p></pre>everdev: <pre><p>That works for writing JSON without empty fields, but I think the pointer is the right solution for detecting empty fields when reading JSON.</p></pre>TheBeasSneeze: <pre><p>Don't use words in this case, use different http methods: GET, POST, PUT, PATCH and DELETE depending on if you want to get data, add data, update or delete.</p></pre>
