apigen

apigen is a tool written in go that parses go structs and generates code for querying the database based on GORM ORM. It also generates sql for creating postgres TYPES (enums) for enumerated constants in the module.

Features

• generates services for all structs in your models unless skipped in the configuration file(apigen.toml)
• Created database connection helper with sane defaults.
• Preloads all relationships(even nested relationships - for now) by default. Because the parser knows foreign keys and tree, we are able to do that for all foreignKey and many2many fields.
• Allows for customizing all queries by specifying optional Where, ordering, grouping, select options ...services.Options These options are passed to the callable handlers that are designed with the decorator pattern.
• Generates typescript interfaces for your models.

Installation

As a CLI tool

go install github.com/abiiranathan/apigen@latest

As a library

go get -u github.com/abiiranathan/apigen

Initialize project and create a configuration file apigen.toml

apigen init

The configuration file has the following format:

# Note that toml(v2) requires single quotes for strings

[Models]
# package containing your models.
Pkg='github.com/abiiranathan/apigen/models'

# List of models to skip when generating services and handlers
Skip=['User', 'Payment']

[Output]
# The directory to put the generated code. (Default is current working directory)
OutDir='.'

# Name for your services package
ServiceName='services'

# Overrides for enumerated constants
# These will be used for the typescript fields.
[overrides]
  [overrides.types]
    Sex='"Male" | "Female"'

  [overrides.fields]
    gender = 'Sex'

Generate code

If apigen.toml is the root of your project.

apigen generate

Or

apigen --config config.toml generate

to specify the custom path to the configuration file.

Using the generated code

import(
    // These will point to the generated code
    "github.com/yourname/cool-api/gen/handlers"
	"github.com/yourname/cool-api/gen/services"

    "github.com/gofiber/fiber/v2"
	"gorm.io/gorm/logger"
)

func main() {
	db, err := services.PostgresConnection(dsn, "Africa/kampala", logger.Silent)
	if err != nil {
		panic(err)
	}

	err = db.AutoMigrate(&models.User{}, ...more models)
	if err != nil {
		log.Fatalf("Error performing database migrations: %v\n", err)
	}

	app := fiber.New()
	api := app.Group("/api/v1")
	svc := services.NewService(db)

    users, err := svc.Users.GetAll()

	app.Listen(":8000")

}