ent/examples/entcpkg

entcpkg example

An example of using entc (ent codegen) as package rather than an executable.

In this example, we have a file named entc.go under the ./ent directory, that holds the configuration for the codegen:

// +build ignore

package main

import (
	"log"

	"github.com/facebookincubator/ent/entc"
	"github.com/facebookincubator/ent/entc/gen"
	"github.com/facebookincubator/ent/schema/field"
)

func main() {
	err := entc.Generate("./schema", &gen.Config{
		Header: `
			// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
			// This source code is licensed under the Apache 2.0 license found
			// in the LICENSE file in the root directory of this source tree.

			// Code generated (@generated) by entc, DO NOT EDIT.
		`,
		IDType: &field.TypeInfo{Type: field.TypeInt},
	})
	if err != nil {
		log.Fatal("running ent codegen:", err)
	}
}

As you can see, the file is tagged with // +build ignore in order to not include it in the ent package. In order to run the codegen, run the file itself (using go run) or run go generate ./ent. The generate.go file holds the go run command:

package ent

//go:generate go run entc.go

The generate.go file is preferred if you have many generate pragmas in your project.