objectid

问题 I have controller method with ObjectId params: [ProducesResponseType(200, Type = typeof(Test))] [HttpGet] [Route("{id}")] public IActionResult Get(ObjectId id) {... For this API method swagger generates a form with both of complex ObjectId model and string Id instead of single string param: How I can remove extra fields and keep only string Id? 回答1: Find out what answer from another story also adresses this issue: services.AddMvc(options => { ... options.ModelMetadataDetailsProviders.Add( new

问题 How can I set value for __id field in mongo db using flask-MongoEngine? here is my code db = MongoEngine(app) class Book(db.Document): id = db.IntField(required = True) title = db.StringField(required = True) author = db.StringField(required = True) def Create_record(title:str,author:str): book = Book() book.id = "123" book.title = title book.author = author book.save() 回答1: The easiest is to rely on the auto-generated id's from MongoDB ( ObjectID ) which encapsulates a timestamp so it's

问题 I have updated my meteor yesterday and tried using the new Meteor.Collection.ObjectID . But since with no success. First i updated my collections in this way: myCollection = new Meteor.Collection('mycollection', {idGeneration: 'MONGO'} Now, normal new inserts have an _id like Wi2RmR6CSapkmmdfn ... (?) Then i have a collection with an array included. I like to have an unique id for every object in this array. So i $push an object with a field like id: new Meteor.Collection.ObjectID() into my

问题 I'm working on a MongoDB project which stores tweets and was created by someone else. This person decided to use the Twitter tweet ID for the _id field in MongoDB, which means I now have no way to sort the tweets deterministically. Example: > db.tweets.find().sort({_id : 1}).limit(4) {'message' : '...', 'userId' : NumberLong(123), '_id' : NumberLong(1)} {'message' : '...', 'userId' : NumberLong(123), '_id' : NumberLong(2)} {'message' : '...', 'userId' : NumberLong(123), '_id' : NumberLong(3)}

问题 In BSON Java implementation, an ObjectId is composed by 3 pieces (source code: http://grepcode.com/file/repo1.maven.org/maven2/org.mongodb/mongo-java-driver/2.9.0/org/bson/types/ObjectId.java#ObjectId.%3Cinit%3E%28int%2Cint%2Cint%29 ): XXXX XXXX XXXX ------------------------- time machine&pid inc (each X represents a byte) this is a bit different from what's described in document (doc: http://docs.mongodb.org/manual/core/object-id/ ) XXXX XXX XX XXX -------------------------- time machine pid

问题 The object_id of 0 is 1, of 1 is 3, of 2 is 5. Why is this pattern like this? What is behind the Fixnums that make to create that pattern of object_ids? I would expect that if 0 has id 1, 1 has id 2, 2 has id 3.. And so on. What am I missing? 回答1: First things first: the only thing that the Ruby Language Specification guarantees about object_id s is that they are unique in space . That's it. They aren't even unique in time. So, at any given time there can only be one object with a specific

问题 What is the difference between the following two kinds of errors that ObjectSpace._id2ref returns? 0x... is recycled object (RangeError) 0x... is not id value (RangeError) 回答1: not id value means that there never was an object with that id. recycled object means that there once was an object with that id, but it has been garbage collected. Demo on Ruby 1.9.3/Ubuntu: x = Object.new id = x.object_id puts "0x%x" % id # => 0x4aef5e8 puts ObjectSpace._id2ref id # => #<Object:0x95debd0> x = nil

问题 I want to hack ObjectId by manipulating the machineId like this: <timestamp> <machineId> <processId> <inc> UserId XXXXXXXX XXXX01 XXXX XXXXXX OrderId XXXXXXXX XXXX02 XXXX XXXXXX CardId XXXXXXXX XXXX03 XXXX XXXXXX ... the basic idea is to use 1 byte of machineId to distinguish the object type, my question is: is there any problem when doing so (considering uniqueness and sharding)? --- update on Dec 9 --- Due to the difference between the spec and implementation Why the bson java

问题 I currently have a project that's being migrated away from Parse Server but needs to maintain backwards compatibility. Since Parse Server generates it's own object Ids, rather than using Mongo's I'd like to know: How does Parse Server generate it's objectIds? and why does it do this when MongoDB has great objectId generation natively? Will parse be able to work with objects with non-Parse generated IDs? An example: _id: "LvIzxv5spL" // created by Parse Server _id: "507f1f77bcf86cd799439011" /

问题 In my app I'm letting mongo generate order id's via its ObjectId method. But in user testing we've had some concerns that the order id's are humanly 'intimidating', i.e. if you need to discuss your order with someone over the telephone, reading out 24 alphanumeric characters is a bit tedious. At the same time, I don't really want to have to store two different id's, one 'human-accessible' and one used by mongo internally. So my question is this - is there a way to choose a substring of length