{
TypeList" : [
{
"TypeName" : "Carrier"
},
{
"TypeName" : "Not a Channel Member"
},
{
"TypeName" : "Service Provider"
}
]
}
Question :
db.supplies.find("text", {search:"\"chann\" \"mem\""})
For above query I want display :
{
TypeName" : "Not a Channel Member"
}
But I am unable to get my result.
What are changes I have to do in query .
Please help me.
The below query will return your desired result.
db.supplies.aggregate([
{$unwind:"$TypeList"},
{$match:{"TypeList.TypeName":{$regex:/.*chann.*mem.*/,$options:"i"}}},
{$project:{_id:0, TypeName:"$TypeList.TypeName"}}
])
If you can accept to get an output like this:
{
"TypeList" : [
{
"TypeName" : "Not a Channel Member"
}
]
}
then you can get around using the aggregation framework which generally helps performance by running the following query:
db.supplies.find(
{
"TypeList.TypeName": /chann.*mem/i
},
{ // project the list in the following way
"_id": 0, // do not include the "_id" field in the output
"TypeList": { // only include the items from the TypeList array...
$elemMatch: { //... where
"TypeName": /chann.*mem/i // the "TypeName" field matches the regular expression
}
}
})
Also see this link: Retrieve only the queried element in an object array in MongoDB collection
Related
I have tried to get sorted in backend & tested via postman and I am getting sorted order.
const locationInfo = await locationDetails.find(query).sort({sectionName:1});
res.json(locationInfo);
[
{ //some other keys &values
"sectionName": "Closet",
},
{
"sectionName": "Dining",
},
{
"sectionName": "Kitchen",
},
{
"sectionName": "Other",
},
{
"sectionName": "Refrigerator",
}
]
After REST call storing result to,
this.result=data;
but when I try to display the same resultant data on UI, Its not getting displayed in sorted order as well as checked in console also resultant data order got changed.
Console Data
[{
sectionName: "Refrigerator",
},
{
sectionName: "Kitchen",
},
{
sectionName: "Dining",
},
{
sectionName: "Closet",
},
{
sectionName: "Other",
}]
Note: Tried to sort from .ts file also but it is not working.
this.result.sort(function(a,b){a.sectionName-b.sectionName});
If any help would be appreciated. Thanks!
SectioName is not a valid criterion for MongoDB to sort the return result. In this case, MongoDB does not know how to sort it.
Here is an example directly from the MongoDB documentation about cursor.sort():
db.restaurants.insertMany( [
{ "_id" : 1, "name" : "Central Park Cafe", "borough" : "Manhattan"},
{ "_id" : 2, "name" : "Rock A Feller Bar and Grill", "borough" : "Queens"},
{ "_id" : 3, "name" : "Empire State Pub", "borough" : "Brooklyn"},
{ "_id" : 4, "name" : "Stan's Pizzaria", "borough" : "Manhattan"},
{ "_id" : 5, "name" : "Jane's Deli", "borough" : "Brooklyn"},
] );
# The following command uses the sort() method to sort on the borough field:
db.restaurants.find().sort( { "borough": 1 } )
Documents are returned in alphabetical order by borough, but the order of those documents with duplicate values for borough might not be the same across multiple executions.
.sort works best with numerical values. If you are in control of the backend and are able to change how data is stored in the database. I suggest you create a field for the creation date or just an index to indicate the order of the items.
Let's say your document looks something like this:
# Doc 1
{
sectionName: "Refrigerator",
order:1
}
# Doc 2
{
sectionName: "Refrigerator",
order:2
}
Then you can do
const locationInfo = await locationDetails.find(query).sort({order:1});
which will return you the documents sorted using the order field, and the order will be consistent.
my schema looks like
{
qty:{
property1:{
//something
}
property2:[{
size:40,
color:"black",
enabled:"true"
}]
}
}
property 2 is array what i want to do is update those array object whose enabled is true in single query
I tried writing the following query
db.col.update({
"qty.property2.enabled" = "true"
}, {
"qty.property2.color" = "green"
}, callback)
but it is not working
error:
[main] Error: can't have . in field names [qty.pro.size]
db.col.update({"qty.property2.enabled":"true"},{$set: {'qty.property2.$.color': 'green'}}, {multi: true})
this is the way to update element inside array.
equal sign '=' cannot be used inside object
updating array is done using $
Alternative solution for multiple conditions:
db.foo.update({
_id:"i1",
replies: { $elemMatch:{
_id: "s2",
update_password: "abc"
}}
},
{
"$set" : {"replies.$.text" : "blah"}
}
);
Why
So I was looking for similar solution as this question, but in my case I needed array element to match multiple conditions and using currently provided answers resulted in changes to wrong fields.
If you need to match multiple fields, for example let say we have element like this:
{
"_id" : ObjectId("i1"),
"replies": [
{
"_id" : ObjectId("s1"),
"update_password": "abc",
"text": "some stuff"
},
{
"_id" : ObjectId("s2"),
"update_password": "abc",
"text": "some stuff"
}
]
}
Trying to do update by
db.foo.update({
_id:"i1",
"replies._id":"s2",
"replies.update_password": "abc"
},
{
"$set" : {"replies.$.text" : "blah"}
}
);
Would result in updating to field that only matches one condition, for example it would update s1 because it matches update_password condition, which is clearly wrong. I might have did something wrong, but $elemMatch solution solved any problems like that.
Suppose your documet looks like this.
{
"_id" : ObjectId("4f9808648859c65d"),
"array" : [
{"text" : "foo", "value" : 11},
{"text" : "foo", "value" : 22},
{"text" : "foobar", "value" : 33}
]
}
then your query will be
db.foo.update({"array.value" : 22}, {"$set" : {"array.$.text" : "blah"}})
where first curly brackets represents query criteria and second one sets the new value.
I have a document in mongodb, like this one:
{ "_id" : "a", "array" : [ { "aa" : "11", "bb" : "22" } ] }
I want to insert an array in the array above, so the result looks like:
{"_id":"a","array":[{"aa":"11","bb":"22","cc":[{mm:"11"},{mm:"22"}]}]}
I am writing a node.js program and using the mongojs module to connect to mongodb. I have tried using db.collection.aggregate({"$unwind":"$name"}), but I don't know how to solve this.
If you want to update document then used update with push as below
db.collectionName.update(
{"_id":"a"},
{
"$push":{
"array":{
"cc":[
{"mm":"11"},
{"mm":"22"}
]
}
}
})
Or if you want to add new field in aggregation then use project with literal as below
db.collectionName.aggregate({
"$project":{
"array":{
"$map":{
"input":"$array",
"as":"el",
"in":{
"aa":"$$el.aa",
"bb":"$$el.bb",
"cc":{
"$literal":[
{"mm":"11"},
{"mm":"22"}
]
}
}
}
}
}
}).pretty()
I am using the ELK Stack to analyze logs and I need to analyze and detect anomalies of apache access logs. What can I analyze with apache access logs and how should I give the conditions with curl -XPUT to Watcher?
If you haven't found it already, there's a decent tutorial at https://www.elastic.co/guide/en/watcher/watcher-1.0/watch-log-data.html. It provides a basic example of creating a log watch.
You can analyze/watch anything that you can query in Elasticsearch. It's just a matter of formatting the query with the correct JSON syntax. The guide for crafting the conditions is at https://www.elastic.co/guide/en/watcher/watcher-1.0/condition.html.
You'll also want to look at https://www.elastic.co/guide/en/watcher/watcher-1.0/actions.html to get an idea of the possible actions Watcher can take when a query meets a condition.
As far as the post to Watcher, each watch is essentially a JSON object. Because they can get pretty elaborate, I have found that it's best to create a file for each watch you want to create, and post them like this:
curl -XPUT http://my_elasticsearch:9200/_watcher/watch/my_watch_name -d #/path/to/my_watch_name.json
my_watch_name.json should have these basic elements (as described in the first link above):
{
"trigger" : { ... },
"input" : { ... },
"condition" : { ... },
"actions" : { ... }
}
The actions section is going to be specific to your use case, but here's a basic example of the other sections that I'm using successfully:
{
"trigger" : {
"schedule" : { "interval" : "5m" }
},
"input" : {
"search" : {
"request" : {
"indices" : [ "logstash" ],
"body" : {
"query" : {
"filtered" : {
"query" : {
"match" : { "message" : "error" }
},
"filter" : {
"range" : { "#timestamp" : { "gte" : "now-5m" } }
}
}
}
}
}
}
},
"condition" : {
"compare" : { "ctx.payload.hits.total" : { "gt" : 0 } }
},
"actions" : {
...
}
}
Currently I am sorting aggregations by document score, so most relevant items come first in aggregation list like below:
{
'aggs' : {
'guilds' : {
'terms' : {
'field' : 'guilds.title.original',
'order' : [{'max_score' : 'desc'}],
'aggs' : {
'max_score' : {
'script' : 'doc.score'
}
}
}
}
}
}
I want to add another sort option to the order terms order array in my JSON. but when I do that like this :
{
'order' : [{'max_score' : 'desc'}, {"_count" : "desc"},
}
The second sort does not work. For example when all of the scores are equal it then should sort based on query but it does not work.
As a correction to Andrei's answer ... to order aggregations by multiple criteria, you MUST create an array as shown in Terms Aggregation: Order and you MUST be using ElasticSearch 1.5 or later.
So, for Andrei's answer, the correction is:
"order" : [ { "max_score": "desc" }, { "_count": "desc" } ]
As Andrei has it, ES will not complain but it will ONLY use the last item listed in the "order" element.
I don't know how your 'aggs' is even working because I tried it and I had parsing errors in three places: "order" is not allowed to have that array structure, your second "aggs" should be placed outside the first "terms" aggs and, finally, the "max_score" aggs should have had a "max" type of "aggs". In my case, to make it work (and it does actually order properly), it should look like this:
"aggs": {
"guilds": {
"terms": {
"field": "guilds.title.original",
"order": {
"max_score": "desc",
"_count": "desc"
}
},
"aggs": {
"max_score": {
"max": {
"script": "doc.score"
}
}
}
}
}