Introduction

Wrapper and Util for MongoDB driver to perform CRUD operations.

Mongo reference documentation: https://www.mongodb.com/docs/manual/reference

Initialization

err := mdu.Init(
		&mdu.Config{CtxTimeout: 5 * time.Second},
		"mango_test_db",
		options.Client().ApplyURI("mongodb://localhost:27017"))
if err != nil {
    panic(err)
}

MongoDB Collection Definition

By adding mdu.DefaultModel in model will include following attributes and values are generated automatically:

• Mongo Object ID:
  • ID primitive.ObjectID `json:"id" bson:"_id,omitempty"
• Created Date:
  • CreatedAt time.Time `json:"created_at" bson:"created_at"
• Updated Date:
  • UpdatedAt time.Time `json:"updated_at" bson:"updated_at"

Example Model:

type product struct {
	mdu.DefaultModel `bson:",inline"`
	Name             string `json:"name" bson:"name"`
	Price            int    `json:"price" bson:"price"`
}

Create

testProduct := &product{
    Name:  "Test Create",
    Price: 100,
}
productsColl := mdu.Coll(testProduct)
id, err := productsColl.Create(mdu.Ctx(), testProduct)

Update

testProduct.Name = "Test Update"
productsColl := mdu.Coll(testProduct)
err := productsColl.Update(mdu.Ctx(), testProduct)

Find

productsColl := mdu.Coll(&product{})
err := productsColl.FindByID(mdu.Ctx(), id, testProduct)

Delete

productsColl := mdu.Coll(&product{})
err = productsColl.Delete(mdu.Ctx(), testProduct)

FindAll

productsColl := mdu.Coll(&product{})
var results []product
err := productsColl.FindAll(mdu.Ctx(), &results, bson.D{})

APIs

• FindByID: FindByID method finds a doc and decodes it to a model, otherwise returns an error.
• First: First method searches and returns the first document in the search results.
• Create: Create method inserts a new model into the database.
• Update: Update function persists the changes made to a model to the database using the specified context.
• Delete: Delete method deletes a model (doc) from a collection using the specified context.
• FindAll: FindAll finds, decodes and returns the results using the specified context.