Entity

Create Entity

For example, we create an Entity student in the module demo-student

1. Cli command

$ vona :create:bean entity student --module=demo-student

2. Menu command

TIP

Context Menu - [Module Path]: Vona Create/Entity

Entity Definition

@Entity<IEntityOptionsStudent>('demoStudent')
export class EntityStudent extends EntityBase {}

• Inherited from the EntityBase class
• Use the Entity decorator
• Set the corresponding data table name

table name

Vona is a modular system, and different modules can manage their own data tables independently. In order to avoid table name conflicts, Vona has agreed on a default combination mechanism for data table names. Of course, you can also provide your own table name, but you need to evaluate the risk of table name conflicts yourself

1. General format

tableName = moduleName + entityName

For example, the entity book of the module demo-student has a corresponding data table name of: demoStudentBook

2. Simplified rules

If entityName has the same name as moduleName, the duplicate part will be automatically removed

For example, the entity student of the module demo-student has a corresponding data table name of: demoStudent

@Api.field

Generally speaking, when defining a field, you need to specify the field type, validation rules, and Swagger/Openapi metadata

In Entity You only need to use the @Api.field decorator to provide all the above information, making the code more concise and intuitive

The parameter usage mechanism of the @Api.field decorator is similar to the Controller request parameter, see:

• Validation
• Swagger/Openapi

Field type and validation rules

1. Automatically infer Zod Schema: Basic type/Dto/Entity

If the field type is Basic type/Dto/Entity, then the system will automatically infer the corresponding Zod Schema and automatically generate Swagger/Openapi

• Example: string

class EntityStudent {
  @Api.field()
  name: string;
}

• Example: EntityBook

class EntityStudent {
  @Api.field()
  book: EntityBook;
}

• List of automatically inferred types

Name	Description
string	z.string()
number	z.number()
boolean	z.boolean()
Dto	z.object({...})
Entity	z.object({...})

2. Specify Zod Schema

We can also explicitly specify Zod Schema and automatically generate Swagger/Openapi

• Example: number, >=18

class EntityStudent {
  @Api.field(z.number().min(18))
  age: number;
}

3. Extending Zod Schema properties

We can also extend new properties based on the existing Zod Schema

• Example: number, optional, default value is 18

class EntityStudent {
  @Api.field(v.default(18), v.optional())
  age?: number;
}

The above code is equivalent to:

class EntityStudent {
  @Api.field(z.number().optional().default(18))
  age?: number;
}

Also equivalent to:

class EntityStudent {
  @Api.field(v.default(18), z.number().optional())
  age?: number;
}

4. Special tool: Array

For Array type parameters, Vona also provides convenient tools

• Example: number[]

class EntityStudent {
  @Api.field(v.array(Number))
  bookIds: number[];
}

Equivalent to:

class EntityStudent {
  @Api.field(v.array(z.number()))
  bookIds: number[];
}

• Example: EntityBook[]

class EntityStudent {
  @Api.field(v.array(EntityBook))
  books: EntityBook[];
}

These utility methods for extending Zod Schema are put into the decorator group v to reduce the mental burden

Swagger/Openapi

Vona also provides many extension tools for setting metadata related to Openapi

Name	Description
v.default	default
v.optional	optional
v.openapi	openapi
v.title	title
v.description	description
v.example	example

1. Example: v.title

title='Name'

class EntityStudent {
  @Api.field(v.title('Name'))
  name: string;
}

2. Example: v.openapi

We can use v.openapi to set more metadata at once

title='Name', example='Tom'

class EntityStudent {
  @Api.field(v.openapi({ title: 'Name', example: 'Tom' }))
  name: string;
}

I18n

Vona provides I18n for Openapi. For example, title is Name, and the steps to support multiple languages ​​are as follows:

1. Provide language resources

For how to add language resources, see: I18n

• English: src/module/demo-student/src/config/locale/en-us.ts

export default {
  Name: 'Name',
};

• Chinese: src/module/demo-student/src/config/locale/zh-cn.ts

export default {
  Name: '姓名',
};

2. Use $locale

Use the $locale method for language translation, and support automatic type hints for language resources

import { $locale } from '../.metadata/index.ts';

@Api.field(v.title($locale('Name')))

• English

• Chinese

Entity Options

Name	Description
table	The table name corresponding to entity
independent	Whether to display independently in Swagger/Openapi, the default is false
openapi	Metadata related to Swagger/Openapi
fields	Define Fields options

• independent: If the Controller Action references entity, then the entity will be automatically output to Swagger/Openapi. If independent: true is specified, the entity will always be output to Swagger/Openapi

1. Example: openapi

Provide description information for entity so that it can be displayed in Swagger/Openapi

@Entity({
  openapi: { description: 'Student' },
})
class EntityStudent {}

• Support I18n

(Creating language resources: omitted)

import { $locale } from '../.metadata/index.ts';

@Entity({
  openapi: { description: $locale('Student') },
})
class EntityStudent {}

2. Example: fields

Change the validation rules of the field age to: number, optional, default value is 16

Change the openapi metadata of the field name to: title: 'Student Name'

@Entity({
  fields: {
    age: z.number().optional().default(16),
    name: { title: 'Student Name' },
  },
})
class EntityStudent {}

App config configuration

Entity options can be configured in App config

src/backend/config/config/config.dev.ts

// onions
config.onions = {
  entity: {
    'demo-student:student': {
      openapi: {
        description: 'Student',
      },
      fields: {
        age: z.number().optional().default(16),
        name: { title: 'Student Name' },
      },
    },
  },
};

Base class: EntityBase

By default, entity inherits from the base class EntityBase. EntityBase provides several commonly used fields. You can implement your own base class according to business needs

Name	Type	Description
id	TableIdentity	TableIdentity is a union type of string and number
createdAt	Date	Creation time
updatedAt	Date	Update time
deleted	boolean	Soft deletion
iid	number	Instance ID/Tenant ID

• id: Use the TableIdentity type to support business systems of any size

id: TableIdentity

The key field id uses the TableIdentity type to support business systems of any size. When we use int64 as the database field type, the value read from the database is of string type

export type TableIdentity = string | number;

• Set the default field type

When creating a data table, the system will use number or bigint as the type of the id field according to the current configuration, and the default is bigint

src/backend/config/config/config.dev.ts

// modules
config.modules = {
  'a-orm': {
    'table': {
      identityType: 'bigint',
    },
  },
};