php editor Apple will introduce you how to correctly create mongo models and clients. When developing with MongoDB, creating models and clients is a very important step, as they determine your flexibility and efficiency in subsequent operations. First, you need to enable MongoDB support by installing the MongoDB extension. You can then use the API provided by MongoDB to create models and clients. When creating a model, you need to define relevant information such as collection names, fields, and indexes. When creating a client, you need to specify MongoDB connection information, such as host name, port number, and authentication information. By creating models and clients correctly, you will be able to better operate the MongoDB database and improve development efficiency and code quality.
Question content
I have a model that I want to insert and read from mongodb:
type TripFeedback struct { ID primitive.ObjectID `json:"_id" bson:"_id"` UserID string `json:"user_id" bson:"user_id"` WaybillID uint64 `json:"waybill_id" bson:"waybill_id"` Rating Rating `json:"rating" bson:"rating"` Comment string `json:"comment" bson:"comment"` CreatedAt time.Time `json:"created_at" bson:"created_at"` }
I want the ID field to auto-increment inside mongo, so I leave the ID field empty:
feedback := model.NewTripFeedback( createRequest.UserID, createRequest.WaybillID, rating, createRequest.Comment, createRequest.ReceivedAt, ) _, err = r.collection.Create(ctx, feedback)
Additionally, when creating the repository I do this:
// NewFeedbackRepository connects to mongo db and feedback collection. func NewFeedbackRepository(ctx context.Context, client *mongo.Client) (*FeedbacksRepository, error) { r := FeedbacksRepository{ c: client.Database(dbName).Collection(feedbackCollectionName), metrics: NewMetrics(), } if err := r.migrate(ctx); err != nil { return nil, err } return &r, nil } // migrate ensures presence of dossier collection in database. func (r *FeedbacksRepository) migrate(ctx context.Context) error { mdb := r.c.Database() cs, lcErr := mdb.ListCollectionNames(ctx, bson.M{"name": feedbackCollectionName}) if lcErr != nil { return fmt.Errorf("migrate: list collections error: %w", lcErr) } if len(cs) == 0 { if err := mdb.CreateCollection(ctx, feedbackCollectionName); err != nil { return fmt.Errorf("migrate: create collection error: %w", err) } } return nil }
Can you tell me what I'm doing wrong? I haven't really understood how to properly use the _id field in mongo db. I want it to be created and handled inside mongo
write errors : [E11000 duplicate key error collection: drive.feedback index: _id_ dup key: { _id: ObjectId('000000000000000000000000') }]"
Solution
If not passed in, MongoDB will generate the ID. In your structure, the IDs you pass in are all zeros.
You can do two things:
You can generate it yourself:
feedback := model.NewTripFeedback( ID: primitive.NewObjectID(), createRequest.UserID,
Or, you didn't pass it in:
type TripFeedback struct { ID *primitive.ObjectID `json:"_id" bson:"_id,omitempty"` UserID string `json:"user_id" bson:"user_id"` ...
Then, if the ID is not initialized, the ID will be generated.
The above is the detailed content of How to create mongo model and client correctly?. For more information, please follow other related articles on the PHP Chinese website!

This article explains Go's package import mechanisms: named imports (e.g., import "fmt") and blank imports (e.g., import _ "fmt"). Named imports make package contents accessible, while blank imports only execute t

This article explains Beego's NewFlash() function for inter-page data transfer in web applications. It focuses on using NewFlash() to display temporary messages (success, error, warning) between controllers, leveraging the session mechanism. Limita

This article details efficient conversion of MySQL query results into Go struct slices. It emphasizes using database/sql's Scan method for optimal performance, avoiding manual parsing. Best practices for struct field mapping using db tags and robus

This article demonstrates creating mocks and stubs in Go for unit testing. It emphasizes using interfaces, provides examples of mock implementations, and discusses best practices like keeping mocks focused and using assertion libraries. The articl

This article explores Go's custom type constraints for generics. It details how interfaces define minimum type requirements for generic functions, improving type safety and code reusability. The article also discusses limitations and best practices

This article details efficient file writing in Go, comparing os.WriteFile (suitable for small files) with os.OpenFile and buffered writes (optimal for large files). It emphasizes robust error handling, using defer, and checking for specific errors.

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

This article explores using tracing tools to analyze Go application execution flow. It discusses manual and automatic instrumentation techniques, comparing tools like Jaeger, Zipkin, and OpenTelemetry, and highlighting effective data visualization


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version
Visual web development tools

Notepad++7.3.1
Easy-to-use and free code editor

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
