以下是我要更新的文档的架构:
{
"field1" : "value1",
"field2" : "value2",
"field3" : {
"list" : [
{
"content" : "valueA",
"start" : "valueA",
"group" : "valueA"
},
{
"content" : "valueB",
"start" : "Needs_Updation",
"group" : "valueB"
},
]
}
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我想更新文档的“Needs_Updation”值。
我尝试过以下操作:
db.collection.update({
"field1":"value1" ,
"field3.list" :{"$elemMatch" : {"content" : "valueB","group": "valueB" }}},
{"$set":{"field3.list.$.start" : "Updated_Value"}}
)
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还有一个更简单的查询,例如:
db.collection.update({
"field1":"value1" ,
"field3.list.content":"valueB",
{"$set":{"field3.list.$.start" : "Updated_Value"}}
)
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我正在使用 PyMongo,有没有办法更新此类文档?
在关键的新闻活动中,能使用KeyChar财产以及KeyDown能使用的活动KeyValue.我需要 在事件中使用KeyValue和KeyChar属性KeyPress.我该怎么做?
我是Yii2框架和PHP的新手.我使用Mongo DB作为后端数据库.我从集合中获取文档并从控制器返回数据作为Json.返回的数据如下所示.
{
"55b08c383e1a36233fdbdc06": {
"_id": { "$id": "55b08c383e1a36233fdbdc06" },
"address": [ "abcdgt", "zxcv" ],
"age": "23",
"email": [ "qwert@gmail.com","abcd@mail.com" ],
"location": "kollam",
"name": "ajiths",
"phoneno": [ "9522585456", "7875642256" ] ,
"sex": "male"
}
}
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但是在尝试提醒result.name时,我收到了"Undefined" 在Javascript代码中.前端的代码如下所示.
function loadClient(id){
url = "<?= Yii::getAlias('@serverpathweb')?>/client/showclient?id="+id;
$.ajax({
url: url ,
method: "GET",
success: function(result){
alert(result.name);
}
});
}
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控制器端的代码如下所示.
public function actionShowclient($id) {
$clientdetail = Yii::$app->mongodb->getCollection('client');
$result = $clientdetail->find(["_id" =>$id]);
Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return $result;
}
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任何人都可以告诉我如何获得值result.name.
我试图在mongodb中乘以2个字段。两者均为数字类型,但mongodb返回$multiply only supports numeric types。该集合是:
{
"_id" : ObjectId("55e07eb54acc499bb3daae6a"),
"propertytype" : "Hotel",
"name" : "Rude Lounge2",
"costing" : {
"vegperplate" : 350,
"nonvegperplate" : 450,
"flatcharge" : 20000
},
"capacity" : {
"min" : 90,
"max" : 200
}
}
{
"_id" : ObjectId("55e07ebe4acc499bb3daae6b"),
"propertytype" : "Hotel",
"name" : "Rude Lounge3",
"costing" : {
"vegperplate" : 350,
"nonvegperplate" : 450,
"flatcharge" : 20000
},
"capacity" : {
"min" : 90,
"max" : 200
}
}
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我的查询是:
> db.properties2.aggregate( …Run Code Online (Sandbox Code Playgroud) 我有以下文件:
{
array: [
{
type: 'error',
data: 1
},
{
type: 'error',
data: 2
}
]
}
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无论如何,我是否只能获取每个数组元素中的数据字段并将其作为数组返回?就像下面这样:
[1, 2] // <--- array containing only the data fields
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mongodb 投影文档似乎没有涵盖这一点?
我有以下数据库条目:
我的插入查询
db.collection.insert({company:"C3",model:"M3",price:55600,discount:9,resolution:"100X700",connectivity:"hdmi2",warranty:"3",image:"image2.jpg",size:50,display:"lcd",brand:"Brand4",functionality:"functionality2"});
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有超过2000个条目,我试图找出整个集合中的最大和最小价格,如下所示:
db.collection.find({max:{$max:"$price"}, min:{$min:"$price"}});
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希望输出为{max:2000,min:5000},请帮助.谢谢
在MongoDB集合中,我有物化路径树模型,如:
",Books,Programming,Databases,NoSQL,"
",Books,Programming,Databases,SQL,"
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用于获取所有使用的后代Programming:
db.categories.find( { path: /,Programming,/ } )
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创建请求的任何可用性是否只能找到直接后代Programming?即会找到记录,Databases但不会NoSQL和SQL.
我有这样的文档集
{ "owner": "550511223", "file_name": "55234OT01", "file_type": "other", "comment": "Just fix it"},
{ "owner": "550510584", "file_name": "55584RS01", "file_type": "resume", "comment": "Good enough"},
{ "owner": "550511223", "file_name": "55234AP01", "file_type": "applicant", "comment": "This will do"}
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我需要一个像这样的对象的结果
{
[{
"owner" : "550510584",
"files" : [{"file_name": "55584RS01","file_type": "resume","comment": "Good enough"}],
},{
"owner" : "550511234",
"files" : [{"file_name": "55234AP01","file_type": "applicant","comment": "This will do"},
{"file_name": "55234OT01","file_type": "other","comment": "Just fix it"}]
}]
}
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我正在寻找一种方法来做到这一点。我尝试过分组和聚合,但我只能将 file_name 字段推入,因为我搞乱了语法
我想在我的Django应用程序中显示一个特定类的属性列表.例如,显示博客文章的所有标题:
Models.py
class BlogPost(models.Model):
title = models.CharField(max_length=128)
message = models.CharField(max_length=30)
def __unicode__(self):
return self.title
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然后在我的上下文字典中我收到错误:
类型对象'BlogPost'没有属性'title'
Views.py
def index(request):
context = RequestContext(request)
blog_list = BlogPost.title # I understand here is the issue.
context_dict = {'blog': blog_list}
return render_to_response('rango/blog.html', context_dict, context)
Run Code Online (Sandbox Code Playgroud) 我有一个抽象基类,该基类向用户模型声明了两个外键字段:
class BaseModel(models.Model):
updated = models.DateTimeField(null=True)
updated_by = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, related_name="updated_by")
created = models.DateTimeField(null=True)
created_by = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, related_name="created_by")
class Meta:
abstract=True
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我有多个从此类继承的类。当我跑makemigrations,我收到以下错误为每个可能的类对和两个created_by和updated_by:
myapp.ClassA.updated_by :(字段E305)“ ClassB.updated_by”的反向查询名称与“ ClassB.updated_by”的反向查询名称发生冲突。
提示:在“ ClassA.updated_by”或“ ClassB.updated_by”的定义中添加或更改related_name参数。
即使我已经设置了related_name。它仅适用于声明的两个外键字段之一。
在一个抽象类中是否可能有两个相同的模型的外键字段,如果是的话,如何设置它?