mongo-go

问题 This specifc question is in relation to using mongodb with the golang package mongo-driver, but I would assume this applies across most interfaces with mongodb. When using Find to query some data from a collection, we can use both the bson.M- and bson.D-type to specify the filter for this find. As per the documentation bson.D should be used if the order of elements matters and bson.M should be used otherwise. D is an ordered representation of a BSON document. This type should be used when the

问题 I need to do addToSet operation using official Go MongoDB driver. In MongoDB we have some docs: { _id: 2, item: "cable", tags: [ "electronics", "supplies" ] } Then to perform addToSet : db.inventory.update( { _id: 2 }, { $addToSet: { tags: { $each: [ "camera", "electronics", "accessories" ] } } } ) Result: { _id: 2, item: "cable", tags: [ "electronics", "supplies", "camera", "accessories" ] } 回答1: $addToSet is an update operation, if you want to update a single document, you may use the

问题 I need to do addToSet operation using official Go MongoDB driver. In MongoDB we have some docs: { _id: 2, item: "cable", tags: [ "electronics", "supplies" ] } Then to perform addToSet : db.inventory.update( { _id: 2 }, { $addToSet: { tags: { $each: [ "camera", "electronics", "accessories" ] } } } ) Result: { _id: 2, item: "cable", tags: [ "electronics", "supplies", "camera", "accessories" ] } 回答1: $addToSet is an update operation, if you want to update a single document, you may use the

问题 I am new to Golang and Graphql so I probably messed a lot of the configuration up but I am struggling to get values returned from my database using the GraphQL API I created. Whenever I query my database using the GraphQL API I created in Golang It throws the error cannot decode UTC datetime into a string type and struggles to get the id out. Here is my GrapqhQL schema: type User { _id: ID! username: String! passwordHash: String! email: String! userInfo: userStats profileStats: profileInfo }

问题 I am watching a tutorial on how to create Go restful APIs that use MongoDB for persistence (this one to be more precise). The instructor is using in his model (struct) both json and bson tags, something like type NoteUpdate struct { ID string `json:"id,omitempty" bson:"_id,omitempty"` Title string `json:"title" bson:"title,omitempty"` Content string `json:"content" bson:"content,omitempty"` ChangedAt int64 `json:"changed_at" bson:"changed_at"` } However the official go driver example does not

问题 I am watching a tutorial on how to create Go restful APIs that use MongoDB for persistence (this one to be more precise). The instructor is using in his model (struct) both json and bson tags, something like type NoteUpdate struct { ID string `json:"id,omitempty" bson:"_id,omitempty"` Title string `json:"title" bson:"title,omitempty"` Content string `json:"content" bson:"content,omitempty"` ChangedAt int64 `json:"changed_at" bson:"changed_at"` } However the official go driver example does not

问题 I have three unique indexes in my collection. When user accidentally insert a data having a duplicate in the field B , how do I know that the duplication comes from field B ? On unique index constraint violation, mongo-go-driver behavior is returning err WriteException , which basically consist of an array of WriteError and some other object. The WriteError itself (from mongo-go-driver) : // WriteError is an error that occurred during the execution of a write operation. This error type is

问题 I try to create a MongoDB query filter with the nested operators (OR/AND/...). But lib requires to create a bson.D and pass bson.E elements into it. If I need to have OR/AND inside AND/OR - I need to put bson.M + bson.D inside bson.D like this: filter := bson.M{"$and": bson.D{{"p", 10}, bson.M{"$or": bson.D{{"s", 30}, {"a", 1}}}}} .. and of course it doesn't work: cannot use primitive.M literal (type primitive.M) as type primitive.E in slice literal . Probably the same problem will happen if

问题 Im trying to do Pagination with MongoDB I write this code: findOptions := options.Find() findOptions.SetLimit(20) findOptions.SetSort(bson.M{{"_id", 1}}) cursor, err34 := collection.Find(context.Background(), bson.M{{"_id", bson.M{{"$gte", last_id}}}}, findOptions) Now It keeps complaining: missing type in composite literal go AND missing key in map literal go It complains for this part: findOptions.SetSort(bson.M{{"_id", 1}}) and bson.M{{"_id", bson.M{{"$gte", last_id}}}}, findOptions) I'm

问题 Hi there :) I'm working on a golang app linked to mongo DB (I use the official driver: mongo-go ) and here's my problem,I want to execute this function db.rmTickets.find().forEach(function(doc) { doc.created=new Date(doc.created) doc.updated=new Date(doc.updated) doc.deadline=new Date(doc.deadline) doc.dateEstimationDelivery=new Date(doc.dateEstimationDelivery) doc.dateTransmitDemand=new Date(doc.dateTransmitDemand) doc.dateTransmitQuotation=new Date(doc.dateTransmitQuotation) doc