goose

A golang struct tags(schema) style mongo package hyper interface base on mongo-driver, inspired by Node.JS package mongoose

Examples

You can check the /examples/ folder.

cd ./examples && go run ./simple.go

Document

Database

Once you connect database in main function, you can new a model in everywhere.

Connect to Mongo by .env file

func main() {
  err := godotenv.Load()
  if err != nil {
    t.Error(err)
  }
  db, err := goose.NewMongoDatabase(&goose.DatabaseOptions{
    UsingEnv: true,
  })
  if err != nil {
    t.Fatal(err)
  }
  defer db.Close()
  
  // do something else
}

Connect to Mongo

  mongoConnStringTemplate := "mongodb://%s:%s@%s:%s"
  connectionURI := fmt.Sprintf(mongoConnStringTemplate, "root", "example", "localhost", "27017")

  db, err := goose.NewMongoDatabase(&goose.DatabaseOptions{
    DatabaseName: "test",
    URL:          connectionURI,
  })
  if err != nil {
    t.Fatal(err)
  }
  defer db.Close()

  // do something else

Model

Init a model

// define struct as a schema
type User struct {
  ID    primitive.ObjectID `goose:"objectID,primary,required" bson="_id"`
  Name  string             `goose:"required" bson="name"`
  Email string             `goose:"required" bson="email"`
}

func main() {
  // init model with some data
  user := &User{
    ID:    primitive.NewObjectID(),
    Name:  "Pascal",
    Email: "pascal@example",
  }

  // new a model
  userModel := goose.NewModel("TestUsers", user)

  // update model data
  user.Name = "Pascal Lin"

  // save model, create or update
  err = userModel.Save()
  if err != nil {
    t.Fatal(err)
  }
}

Tags

Using goose, you can using tags to specific some data relationship and normal business logic, there is the tag list below:

TagName	Usage	Description
primary	goose:"primary"	define a primary key for you collection model, default will set model primary key _id
index	goose:"index"	add field indexes to collection
default	goose:"default='test'" or goose:"default=1" or goose:"default=1.1" or goose:"default=false"	set default value for model field, string should be quote by ' and not including ,; int and float will convert to 64 bit, you should not add bson:omitempty if default=0
populate	goose:"populate=Users" or goose:"populate=User" ref="Users" foreignKey="_id"	populate data from other collection, if not setting ref and foreignKey, populate should be populate=[COLLECTION_NAME] and default foreignKey is _id
createdAt	goose:"createdAt"	set field as created time
updatedAt	goose:"updatedAt"	set field as updated time
deletedAt	goose:"deletedAt"	set field as soft delete time
-	goose:"-"	do nothing

A whole example:

type Post struct {
  ID          primitive.ObjectID `goose:"primary" bson:"_id,omitempty"`
  UserID      primitive.ObjectID `goose:"populate=User" bson:"userId,omitempty" ref:"TestUsers" forignKey:"_id"`
  Title       string             `goose:"-" bson:"title,omitempty"`
  Description string             `goose:"default='No description.'"  bson:"description,omitempty"`
  CreatedTime time.Time          `goose:"index,createdAt" bson:"createdTime,omitempty"`
  UpdatedTime time.Time          `goose:"updatedAt" bson:"updatedTime,omitempty"`
  ViewCount   int64              `goose:"default=0" bson:"viewCount"`
  Rate        float64            `goose:"default=0" bson:"rate"`
  IsPublished bool               `goose:"default=false" bson:"isPublished"`
}

Collection

You can still using collection from mongo-driver database as usual. such as,

singleResult := goose.DB.Collection("TestUsers").FindOne(context.Background(), bson.M{"_id": userID})
var userResult User
singleResult.Decode(&userResult)
fmt.Println("user: ", userResult)

Development

Run godoc documents

git clone https://github.com/pascallin/goose.git

go get -v  golang.org/x/tools/cmd/godoc

godoc -http=:6060

# visit http://localhost:6060/pkg/github.com/pascallin/goose/pkg/mongo/

Test

go test -v ./test

Todo list

• remove env (seems stupid idea)
• context handling
• test coverage