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mongodb , wildcard in $in


mongodb , wildcard in $in

By : user148082
Date : November 14 2020, 04:48 PM
help you fix your problem I have a mongodb query where i want to get documents if a field has particular value. , I think this is logically consistent behavior for $in. The query
code :
db.collection.find({ "key" : { "$in" : [] } })
db.collection.distinct("key")
db.collection.find()


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MongoDB wildcard in the key of a query

MongoDB wildcard in the key of a query


By : Noob
Date : March 29 2020, 07:55 AM
wish helps you As asked, this is not possible. The server issue you linked to is still under "issues we're not sure of".
MongoDB has some intelligence surrounding the use of arrays, and I think that's part of the complexity surrounding such a feature.
code :
{ a: { b: 4 } }
{ a: [ { b: 4 } ] }
Mongodb dot notation wildcard?

Mongodb dot notation wildcard?


By : Midwest Winterizing
Date : March 29 2020, 07:55 AM
it fixes the issue I think it would be easier if you put that services object into an array, so you can use $elemMatch, like:
code :
{
  services : [
    {key: "a" , credits : 100, score : 2000 },
    {key: "b", credits : 200, score : 300 },
    {key: "c", credits : 10, score : 1300 }
  ]
}
{
  _id: 4f0ea25072139e4d2000001f,
  services : [
    {key: "f", credits : 68, score : 14 },
    {key: "q", credits : 1000, score : 102 },
    {key: "z", credits : 59, score : 352 }
  ]
}
db.coll.find({services: {$elemMatch : {credits: {$lt: 50}}}});
{ "_id" : ObjectId("4f0f2be07561bf94ea47eec4"), "services" : [  {   "key" : "a", "credits" : 100, "score" : 2000 }, { "key" : "b", "credits" : 200, "score" : 300 },    {   "key" : "c",    "credits" : 10,     "score" : 1300 } ] }
Morphia mongoDB wildcard query

Morphia mongoDB wildcard query


By : J Matos
Date : March 29 2020, 07:55 AM
should help you out What you refer to as a "wildcard" is in fact a "Regular Expression".
The Java class which represents regular expressions is the Pattern. You can pass these to the filter method of Morphia's Query object.
code :
// create a regular expression which matches any string which includes "test"
Pattern regexp = Pattern.compile("test");
// use this regular expression to create a query
Query q = ds.createQuery(File.class).filter("filename", regexp).sort("filename");
MongoDB find using wildcard

MongoDB find using wildcard


By : Gawhyr Ghun
Date : March 29 2020, 07:55 AM
should help you out I have very little experience with Mongo and just cannot seem to get this query to work. I have a document that looks like this: , This should be quite simple:
code :
db.collection.find( { "value.denominator" : true, "value.measure_id" : "0024" } );
Wildcard Search in MongoDB

Wildcard Search in MongoDB


By : Katja Bele
Date : March 29 2020, 07:55 AM
this will help For wildcards like this, you can use regex which would look something like:
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