blocks|key|908349|text|你得到它是因为你试图从字典中获取一个键，而它并不在字典中。您需要首先测试它是否在其中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|908350|尝试：|908351|is_private+=+'is_private'+in+request.POST|code-block|syntax|javascript|908352|或|908353|is_private+=+'is_private'+in+request.POST+and+request.POST['is_private']|908354|这取决于您正在使用的值。|908355|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>You get that because you're trying to get a key from a dictionary when it's not there. You need to test if it is in there first.</p>

<p>try:</p>

<pre><code>is_private = 'is_private' in request.POST
</code></pre>

<p>or </p>

<pre><code>is_private = 'is_private' in request.POST and request.POST['is_private']
</code></pre>

<p>depending on the values you're using.</p>


blocks|key|908421|text|选择最适合你的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|908422|1|908423|is_private+=+request.POST.get('is_private',+False);|code-block|syntax|javascript|908424|如果request.POST中存在is_private密钥，则is_private变量将等于它，如果不存在，则等于False。|offset|length|style|CODE|908425|2|908426|if+'is_private'+in+request.POST:
++++is_private+=+request.POST['is_private']
else:
++++is_private+=+False|908427|3.|908428|from+django.utils.datastructures+import+MultiValueDictKeyError
try:
++++is_private+=+request.POST['is_private']
except+MultiValueDictKeyError:
++++is_private+=+False|908429|entityMap^0|0|0|0|H|A|V|A|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@$K|12|L|13|M|N]|$K|14|L|15|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|W|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|X|$]]

<p>Choose what is best for you:</p>

<h1>1</h1>

<pre><code>is_private = request.POST.get('is_private', False);
</code></pre>

<p>If <code>is_private</code> key is present in request.POST the <code>is_private</code> variable will be equal to it, if not, then it will be equal to False.</p>

<h1>2</h1>

<pre><code>if 'is_private' in request.POST:
    is_private = request.POST['is_private']
else:
    is_private = False
</code></pre>

<h1>3</h1>

<pre><code>from django.utils.datastructures import MultiValueDictKeyError
try:
    is_private = request.POST['is_private']
except MultiValueDictKeyError:
    is_private = False
</code></pre>


blocks|key|908537|text|使用MultiValueDict的get方法。这也存在于标准字典中，是一种在不存在默认值的情况下获取值的方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|908538|is_private+=+request.POST.get('is_private',+False)|code-block|syntax|javascript|908539|一般来说，|908540|my_var+=+dict.get(<key>,+<default>)|908541|entityMap^0|H|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

<p>Use the MultiValueDict's <code>get</code> method. This is also present on standard dicts and is a way to fetch a value while providing a default if it does not exist.</p>

<pre><code>is_private = request.POST.get('is_private', False)
</code></pre>

<p>Generally,</p>

<pre><code>my_var = dict.get(&lt;key&gt;, &lt;default&gt;)
</code></pre>


blocks|key|908593|text|为什么不尝试在模型中将is_private定义为default=False|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|908594|class+Foo(models.Models):
++++is_private+=+models.BooleanField(default=False)|code-block|syntax|javascript|908595|entityMap^0|B|A|O|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<p>Why didn't you try to define <code>is_private</code> in your models as <code>default=False</code>?</p>

<pre><code>class Foo(models.Models):
    is_private = models.BooleanField(default=False)
</code></pre>


blocks|key|908655|text|另一件要记住的事情是，request.POST['keyword']引用由指定的html+name属性keyword标识的元素。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|908656|所以，如果你的表单是：|908657|<form+action="/login/"+method="POST">
++<input+type="text"+name="keyword"+placeholder="Search+query">
++<input+type="number"+name="results"+placeholder="Number+of+results">
</form>|code-block|syntax|javascript|908658|然后，request.POST['keyword']和request.POST['results']将分别包含输入元素keyword和results的值。|908659|entityMap^0|B|N|19|4|1F|7|0|0|0|3|N|R|N|1N|7|1V|7|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|P|$]]

<p>Another thing to remember is that <code>request.POST['keyword']</code> refers to the element identified by the specified html <code>name</code> attribute <code>keyword</code>.</p>

<p>So, if your form is:</p>

<pre><code>&lt;form action="/login/" method="POST"&gt;
  &lt;input type="text" name="keyword" placeholder="Search query"&gt;
  &lt;input type="number" name="results" placeholder="Number of results"&gt;
&lt;/form&gt;
</code></pre>

<p>then, <code>request.POST['keyword']</code> and <code>request.POST['results']</code> will contain the value of the input elements <code>keyword</code> and <code>results</code>, respectively.</p>


blocks|key|692659|text|当我在Django中使用ajax时，我得到了'MultiValueDictKeyError‘错误。只是因为在选择元素时没有输入'#‘。就像这样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|692660|data:{+name+:+$('id_name').val(),},|code-block|syntax|javascript|692661|然后我把'#‘和id放在一起，问题就解决了。|692662|data:{+name+:+$('#id_name').val(),},|692663|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>I got 'MultiValueDictKeyError' error while using ajax with Django. Just because of not putting '#' while selecting an element. Like this.</p>
<pre><code>data:{ name : $('id_name').val(),},
</code></pre>
<p>then I put the '#' with the id and the problem is solved.</p>
<pre><code>data:{ name : $('#id_name').val(),},
</code></pre>


blocks|key|692722|text|如果请求中不存在该名称，则此操作将插入空值|type|unstyled|depth|inlineStyleRanges|entityRanges|data|692723|name+=+request.data.get('name',+None)|code-block|syntax|javascript|692724|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>This will insert NULL value if the name is not present in the request</p>
<pre><code>name = request.data.get('name', None)
</code></pre>


<p>I'm trying to save a object to my database, but it's throwing a <code>MultiValueDictKeyError</code> error.</p>

<p>The problems lies within the form, the <code>is_private</code> is represented by a checkbox. If the check box is NOT selected, obviously nothing is passed. This is where the error gets chucked.</p>

<p>How do I properly deal with this exception, and catch it? </p>

<p>The line is</p>

<pre><code>is_private = request.POST['is_private']
</code></pre>


django MultiValueDictKeyError error, how do I deal with it

数据库

Django

我正试图将一个对象保存到我的数据库中，但它抛出了一个MultiValueDictKeyError错误。问题出在表单中，is_private由一个复选框表示。如果未选中该复选框，则显然不会传递任何内容。这就是错误被抛出的地方。我如何正确地处理这个异常，并捕获它？这条线是is_private = request.POST[...

问django MultiValueDictKeyError错误，我如何处理它？
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