mongodb-query

问题 We have a situation where a user would like to have a single 'omni-box' for searching for a word\phrase anywhere in a document. Is MongoDB able to perform this search or would it have to be an explicit search of every field? 回答1: You need to create a wildcard text indexes like this: db.collection.createIndex( { "$**": "text" } ) You can the use the $text operator to performs a text search. As mentioned in the documentation: This index allows for text search on all fields with string content.

问题 I have following documents: { _id: 1 items: ['1a', '1b', '1c'] }, { _id: 2, items: ['2a', '2b', '2c'] } Is it possible to pull items from these documents but only if all the items exist? To explain: I need to pull '1a', '1c' and '2b' elemnets from these documents, so I if issue the query like the following: var updateObj = ['1a', '1c', '2b']; db.collection.update({_id : {$in updateObj}}, {$pullAll: {items: updateObj}}); Than will return success and pull the items. However if issue the

问题 I have a MongoDB collection, listed below: { "_id" : ObjectId("001"), "ticker" : "MSFT=US", "exchange" : "OTC", "localtick" : "MSFT", "compname" : "Microsoft", "currency" : "USD", "insertedtime" : ISODate("2016-06-13T23:10:09.341+0000") } { "_id" : ObjectId("002"), "ticker" : "TSLA=CA", "exchange" : "TSX", "localtick" : "TSLA", , "compname" : "Tesla", "currency" : "CAD", "insertedtime" : ISODate("2016-06-13T23:10:09.809+0000") } But when I try to do a filter in my query: var documents =

问题 I'm trying to use a mongodb aggregation query to join($lookup) two collections and then distinct count all the unique values in the joined array. So my two collections look like this: events- { "_id" : "1", "name" : "event1", "objectsIds" : [ "1", "2", "3" ], } Objects { "_id" : "1", "name" : "object1", "metaDataMap" : { "SOURCE" : ["ABC", "DEF"], "DESTINATION" : ["XYZ", "PDQ"], "TYPE" : [] } }, { "_id" : "2", "name" : "object2", "metaDataMap" : { "SOURCE" : ["RST", "LNE"], "TYPE" : ["text"]

问题 $lookup is used to perform a left outer join to an unsharded collection in the same database to filter in documents from the “joined” collection for processing in Mongo. { $lookup: { from: <collection to join>, localField: <field from the input documents>, foreignField: <field from the documents of the "from" collection>, as: <output array field> } } Could the foreignField be the field of the nested document of from collection? For example, there are two collections as following. history

问题 How to Update Multiple Array objects in mongodb. This question was asked earlier - How to Update Multiple Array elements in mongodb But that didn't work for me. I have an array of objects { "_id" : ObjectId("4d2d8deff4e6c1d71fc29a07"), "user_id" : "714638ba-2e08-2168-2b99-00002f3d43c0", "events" : [ { "handled" : { "name": "Mike", "visibile": false }, "profile" : 10, "data" : "....." } { "handled" : { "name": "Shaun", "visibile": false }, "profile" : 10, "data" : "....." } { "handled" : {

问题 This is basically a simple problem, but I couldn't find a query function for it. Example Collection: { _id: 1, foo: [ { bar: 9 }, { bar: 16 } ] } { _id: 2, foo: [ { bar: 9 }, { bar: 9 }, { bar: 9 } ] } Example Output: { _id: 2, foo: [ { bar: 9 }, { bar: 9 }, { bar: 9 } ] } Because this is the only document where every foo.bar = 9. The Query I'm looking for: "FIND all documents WHERE foo.bar = 9 FOR EVERY foo.bar in this document." Or do I need something like "FIND all documents WHERE NOT( foo

问题 UserDetails { "_id" : "5c23536f807caa1bec00e79b", "UID" : "1", "name" : "A", }, { "_id" : "5c23536f807caa1bec00e78b", "UID" : "2", "name" : "B", }, { "_id" : "5c23536f807caa1bec00e90", "UID" : "3", "name" : "C" } UserProducts { "_id" : "5c23536f807caa1bec00e79c", "UPID" : "100", "UID" : "1", "status" : "A" }, { "_id" : "5c23536f807caa1bec00e79c", "UPID" : "200", "UID" : "2", "status" : "A" }, { "_id" : "5c23536f807caa1bec00e52c", "UPID" : "300", "UID" : "3", "status" : "A" } Groups { "_id" :

问题 In Python, I have a list of dictionaries. The list is called members and each member has a unique id . For example, the list could look like this: members = [{'id':1, 'val1':10, 'val2':11}, {'id':2, 'val1':2, 'val2':34}, {'id':3, 'val1':350, 'val2':9}] I want to update my collection with the list of members, updating and inserting new entries as necessary. Do I need to loop through the members, or is there a faster way? Here's my attempt, which seems to do what I want but takes a while: for m

问题 This is an example document in my MongoDB collection: var user: [{ "_id" : ObjectId("5391b11a3c0a9ac01300006d"), "injurydata" : { "injuryinformation" : [ { "status" : "current", "updateddate" : ISODate("2014-06-06T12:16:20.306Z"), "updatedby" : "", "dateofinjury" : ISODate("2014-06-27T18:30:00.000Z"), "_id" : ObjectId("5391b11a3c0a9ac01300006f") } ] } }, { "_id" : ObjectId("5391b11a3c0a9ac01300006d"), "injurydata" : { "injuryinformation" : [ { "status" : "current", "updateddate" : ISODate(