ent 基本使用九 代码生成
ent 提供了cli 工具，可以方便我们进行schema 以及代码生成，同时目前提供的cli已经够用了
安装 cli
go get github.com/facebookincubator/ent/cmd/entc
创建schema
entc init User Pet
生成代码
基于schema 的定义（字段，索引，边，配置）
entc generate ./ent/schema
说明：
生成的代码包含了crud、migrate、entity、client
版本兼容处理
使用独立的cli以及生成的代码，可能会和我们的框架不兼容 ，处理方法使用go:generate
参考配置：
package ent
//go:generate go run github.com/facebookincubator/ent/cmd/entc generate ./schema
代码生成选项
- 命令参数
generate go code for the schema directory
Usage:
entc generate [flags] path
Examples:
entc generate ./ent/schema
entc generate github.com/a8m/x
Flags:
--header string override codegen header
-h, --help help for generate
--idtype [int string] type of the id field (default int)
--storage strings list of storage drivers to support (default [sql])
--target string target directory for codegen
--template strings external templates to execute
- 存储配置
目前ent 生成可以支持sql方言以及Gremlin方言，后期应该还会扩展的 - 外部模版
当前官方提供了一个graphql 的 demo
entc 做为包依赖
entc 可以做为一个包在我们的项目中使用
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: "// Your Custom Header",
IDType: &field.TypeInfo{Type: field.TypeInt},
})
if err != nil {
log.Fatal("running ent codegen:", err)
}
}
查看schema 的描述信息
- 命令
entc describe ./ent/schema
- 参考
City:
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
| Field | Type | Unique | Optional | Nillable | Default | UpdateDefault | Immutable | StructTag | Validators |
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
| id | <nil> | false | false | false | false | false | false | json:"id,omitempty" | 0 |
| name | string | false | false | false | false | false | false | json:"name,omitempty" | 0 |
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
+---------+--------+---------+---------+----------+--------+----------+
| Edge | Type | Inverse | BackRef | Relation | Unique | Optional |
+---------+--------+---------+---------+----------+--------+----------+
| streets | Street | false | | O2M | false | true |
+---------+--------+---------+---------+----------+--------+----------+
Street:
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
| Field | Type | Unique | Optional | Nillable | Default | UpdateDefault | Immutable | StructTag | Validators |
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
| id | <nil> | false | false | false | false | false | false | json:"id,omitempty" | 0 |
| name | string | false | false | false | false | false | false | json:"name,omitempty" | 0 |
+-------+--------+--------+----------+----------+---------+---------------+-----------+-----------------------+------------+
+------+------+---------+---------+----------+--------+----------+
| Edge | Type | Inverse | BackRef | Relation | Unique | Optional |
+------+------+---------+---------+----------+--------+----------+
| city | City | true | streets | M2O | true | true |
+------+------+---------+---------+----------+--------+----------+
