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在`switch_collection'之后，Mongoengine文档被保存而没有字段。

• 问答

使用switch_collection方法保存文档时，我有一个非常奇怪的行为。

可以使用以下代码进行复制：

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                  <h5 class="card-title">overwatch</h5>
                  <p class="card-text">overwatch.exe</p>
                  <a href="overwatch.exe" target="_blank" class="btn btn-secondary">Abrir</a>
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            </div>
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              <div class="card" id="YouTube">
                <img class="card-img-top" src="../../assets/images/YouTube.png">
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                  <h5 class="card-title">YouTube</h5>
                  <p class="card-text">Google Inc.</p>
                  <a href="https://www.youtube.com/" target="_blank" class="btn btn-secondary">Abrir</a>
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              </div>


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                  <h5 class="card-title">Canal de Denuncias</h5>
                  <p class="card-text">https://www.canaldedenuncia.cl/cda/metro/cdpages/Inicio.aspx</p>
                  <a href="https://www.canaldedenuncia.cl/cda/metro/cdpages/Inicio.aspx" target="_blank" class="btn btn-secondary">Abrir</a>
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              <div class="card" id="Cipher">
                <img class="card-img-top" src="">
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                  <h5 class="card-title">Cipher</h5>
                  <p class="card-text">www.cipher.cl</p>
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                  <h5 class="card-title">Terraria</h5>
                  <p class="card-text">shared/terraria.exe</p>
                  <a href="shared/terraria.exe" target="_blank" class="btn btn-secondary">Abrir</a>
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                  <p class="card-text">http://nt25_intranet/archivos/revistas/2017-03/revista.pdf</p>
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                  <p class="card-text">\\NT1_METRO\Aplicacion\Operaciones\smov2\SMOV 2.exe</p>
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                  <p class="card-text">https://metro.openagora.cl/</p>
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              <div class="card" id="The Clinic">
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                  <h5 class="card-title">The Clinic</h5>
                  <p class="card-text">www.theclinic.cl</p>
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                  <p class="card-text">http://www.hotmail.com</p>
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                  <h5 class="card-title">Gmail</h5>
                  <p class="card-text">http://www.gmail.com</p>
                  <a href="http://www.gmail.com" target="_blank" class="btn btn-secondary">Abrir</a>
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                  <p class="card-text">www.cnn.org</p>
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                  <h5 class="card-title">Metro Familia</h5>
                  <p class="card-text">http://andensocial.metro.cl/aplicaciones-generales/metro-en-familia</p>
                  <a href="http://andensocial.metro.cl/aplicaciones-generales/metro-en-familia" target="_blank" class="btn btn-secondary">Abrir</a>
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              <div class="card" id="League of Legends">
                <img class="card-img-top" src="">
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                  <h5 class="card-title">League of Legends</h5>
                  <p class="card-text">lollauncher.exe</p>
                  <a href="lollauncher.exe" target="_blank" class="btn btn-secondary">Abrir</a>
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                <img class="card-img-top" src="">
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                  <h5 class="card-title">Minecraft Java Edition</h5>
                  <p class="card-text">minecraft.exe</p>
                  <a href="minecraft.exe" target="_blank" class="btn btn-secondary">Abrir</a>
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                <img class="card-img-top" src="">
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                  <h5 class="card-title">Webmail Metro</h5>
                  <p class="card-text">https://mail.metro.cl/owa/auth/logon.aspx?replaceCurrent=1&amp;url=https%3a%2f%2fmail.metro.cl%2fowa%2f</p>
                  <a href="https://mail.metro.cl/owa/auth/logon.aspx?replaceCurrent=1&amp;url=https%3a%2f%2fmail.metro.cl%2fowa%2f" target="_blank" class="btn btn-secondary">Abrir</a>
                </div>
              </div>


            </div>
            <div class="col-md-3 col-sm-4 col-xs-6">
              <div class="card" id="Autoconsulta ESS">
                <img class="card-img-top" src="">
                <div class="card-body">
                  <h5 class="card-title">Autoconsulta ESS</h5>
                  <p class="card-text">http://172.16.20.60:84/sse_generico/espanol/generico_login.jsp?estado=0</p>
                  <a href="http://172.16.20.60:84/sse_generico/espanol/generico_login.jsp?estado=0" target="_blank" class="btn btn-secondary">Abrir</a>
                </div>
              </div>


            </div>
            <div class="col-md-3 col-sm-4 col-xs-6">
              <div class="card" id="And&#233;n Social">
                <img class="card-img-top" src="">
                <div class="card-body">
                  <h5 class="card-title">And&#233;n Social</h5>
                  <p class="card-text">http://andensocial.metro.cl</p>
                  <a href="http://andensocial.metro.cl" target="_blank" class="btn btn-secondary">Abrir</a>
                </div>
              </div>


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            <div class="col-md-3 col-sm-4 col-xs-6">
              <div class="card" id="Sitio conductores">
                <img class="card-img-top" src="">
                <div class="card-body">
                  <h5 class="card-title">Sitio conductores</h5>
                  <p class="card-text">http://operaciones.metrosantiago.cl/</p>
                  <a href="http://operaciones.metrosantiago.cl/" target="_blank" class="btn btn-secondary">Abrir</a>
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在调用import mongoengine as me class ObjectA(me.Document): name = me.StringField() def test_strange_behaviour(): a_0 = ObjectA(name="a_0") a_0.save() a_1 = ObjectA(name="a_1") a_1.save() a_1.switch_collection("new_collection",keep_created=False) a_1.id = a_0.id a_1.save() print(a_1._collection) print(a_1._collection.find_one(a_1.id)) 函数时，代码将显示以下内容：

test_strange_behaviour

如您所见，最后的打印显示在Collection(Database(MongoClient(host=['localhost:27017'],document_class=dict,tz_aware=False,connect=True,read_preference=Primary(),connecttimeoutms=30000,heartbeatfrequencyms=3000,ssl=False),'engine'),'new_collection') {'_id': ObjectId('5dc57611dba04ca06410e477')} 集合上创建的文档仅包含new_collection字段，而不包含_id字段。如果name是keep_created，也会发生相同的情况。

为什么会这样？这个例子有问题吗？

poilkjm 回答：在`switch_collection'之后，Mongoengine文档被保存而没有字段。

将 private async void BtnTestFLUrl_Clicked(object sender,EventArgs e) { FlurlClient flurlClient = new FlurlClient("https://www.mocky.io/v2/5dc580f13200008200769b0f?mocky-delay=5000ms"); flurlClient.Configure(settings => settings.Timeout = TimeSpan.FromSeconds(3)); var result = await flurlClient.Request("").GetAsync(); } 归于a_0.id之后，您应该将其保存在a_1.id中，否则就只是更新force_insert=True。

mongodbmongoenginepymongo
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