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https://github.com/Melchyore/adonis-auto-preload

Auto-preload multiple relationships when retrieving Lucid models
https://github.com/Melchyore/adonis-auto-preload

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Auto-preload multiple relationships when retrieving Lucid models

Host: GitHub
URL: https://github.com/Melchyore/adonis-auto-preload
Owner: Melchyore
License: mit
Created: 2022-08-28T10:04:36.000Z (about 2 years ago)
Default Branch: main
Last Pushed: 2022-12-19T14:16:10.000Z (almost 2 years ago)
Last Synced: 2024-07-10T19:57:27.479Z (4 months ago)
Language: TypeScript
Homepage:
Size: 835 KB
Stars: 30
Watchers: 2
Forks: 1
Open Issues: 0
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md

Awesome Lists containing this project

awesome-adonisjs - Adonis Auto-Preload - Auto-preload multiple relationships when retrieving Lucid models (Packages)

README

        


  Adonis Auto-Preload


  
Auto-preload multiple relationships when retrieving Lucid models


  


    

      

    

    

      

    

    

      

    

    

  



## **Pre-requisites**

> Node.js >= 16.17.0

## **Installation**

```sh

npm install @melchyore/adonis-auto-preload

# or

yarn add @melchyore/adonis-auto-preload

# or

pnpm install @melchyore/adonis-auto-preload

```

## **Configure**

```sh

node ace configure @melchyore/adonis-auto-preload

```

## **Usage**

Extend from the AutoPreload mixin and add a new `static $with` attribute.

Adding `as const` to `$with` array will let the compiler know about your relationship names and infer them so you will have better intellisense when using `without` and `withOnly` methods.

Relationships will be auto-preloaded for `find`, `all` and `paginate` queries.

### **Using relation name**

```ts

// App/Models/User.ts

import { BaseModel, column, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

import { AutoPreload } from '@ioc:Adonis/Addons/AutoPreload'

import Post from 'App/Models/Post'

class User extends compose(BaseModel, AutoPreload) {

  public static $with = ['posts'] as const

  @column({ isPrimary: true })

  public id: number

  @column()

  public email: string

  @hasMany(() => Post)

  public posts: HasMany

}

```

```ts

// App/Controllers/Http/UsersController.ts

import User from 'App/Models/User'

export default class UsersController {

  public async show() {

    return await User.find(1) // ⬅ Returns user with posts attached.

  }

}

```

### **Using function**

You can also use functions to auto-preload relationships. The function will receive the model query builder as the only argument.

```ts

// App/Models/User.ts

import { BaseModel, column, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

import { AutoPreload } from '@ioc:Adonis/Addons/AutoPreload'

import Post from 'App/Models/Post'

class User extends compose(BaseModel, AutoPreload) {

  public static $with = [

    (query: ModelQueryBuilderContract) => {

      query.preload('posts')

    }

  ]

  @column({ isPrimary: true })

  public id: number

  @column()

  public email: string

  @hasMany(() => Post)

  public posts: HasMany

}

```

```ts

// App/Controllers/Http/UsersController.ts

import User from 'App/Models/User'

export default class UsersController {

  public async show() {

    return await User.find(1) // ⬅ Returns user with posts attached.

  }

}

```

## **Nested relationships**

You can auto-preload nested relationships using the dot "." between the parent model and the child model. In the following example, `User` -> hasMany -> `Post` -> hasMany -> `Comment`.

```ts

// App/Models/Post.ts

import { BaseModel, column, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

class Post extends BaseModel {

  @column({ isPrimary: true })

  public id: number

  @column()

  public userId: number

  @column()

  public title: string

  @column()

  public content: string

  @hasMany(() => Comment)

  public comments: HasMany

}

```

```ts

// App/Models/User.ts

import { BaseModel, column, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

import { AutoPreload } from '@ioc:Adonis/Addons/AutoPreload'

import Post from 'App/Models/Post'

class User extends compose(BaseModel, AutoPreload) {

  public static $with = ['posts.comments'] as const

  @column({ isPrimary: true })

  public id: number

  @column()

  public email: string

  @hasMany(() => Post)

  public posts: HasMany

}

```

When retrieving a user, it will preload both `posts` and `comments` (`comments` will be attached to their `posts` parents objects).

You can also use functions to auto-preload nested relationships.

```ts

public static $with = [

  (query: ModelQueryBuilderContract) => {

    query.preload('posts', (postsQuery) => {

      postsQuery.preload('comments')

    })

  }

]

```

## **Mixin methods**

The `AutoPreload` mixin will add 3 methods to your models. We will explain all of them below.

We will use the following model for our methods examples.

```ts

// App/Models/User.ts

import { BaseModel, column, hasOne, HasOne, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

import { AutoPreload } from '@ioc:Adonis/Addons/AutoPreload'

import Profile from 'App/Models/Profile'

import Post from 'App/Models/Post'

class User extends compose(BaseModel, AutoPreload) {

  public static $with = ['posts', 'profile'] as const

  @column({ isPrimary: true })

  public id: number

  @column()

  public email: string

  @hasOne(() => Profile)

  public profile: HasOne

  @hasMany(() => Post)

  public posts: HasMany

}

```

### **without**

This method takes an array of relationship names as the only argument. All specified relationships will not be auto-preloaded. You cannot specify relationships registered using functions.

```ts

// App/Controllers/Http/UsersController.ts

import User from 'App/Models/User'

export default class UsersController {

  public async show() {

    return await User.without(['posts']).find(1) // ⬅ Returns user with profile and without posts.

  }

}

```

### **withOnly**

This method takes an array of relationship names as the only argument. Only specified relationships will be auto-preloaded. You cannot specify relationships registered using functions.

```ts

// App/Controllers/Http/UsersController.ts

import User from 'App/Models/User'

export default class UsersController {

  public async show() {

    return await User.withOnly(['profile']).find(1) // ⬅ Returns user with profile and without posts.

  }

}

```

### **withoutAny**

Exclude all relationships from being auto-preloaded.

```ts

// App/Controllers/Http/UsersController.ts

import User from 'App/Models/User'

export default class UsersController {

  public async show() {

    return await User.withoutAny().find(1) // ⬅ Returns user without profile and posts.

  }

}

```

> **Note**

>

> You can chain other model methods with mixin methods. For example, `await User.withoutAny().query().paginate(1)`

## **Limitations**

- Consider the following scenario: `User` -> hasMany -> `Post` -> hasMany -> `Comments`. If you auto-preload `user` and `comments` from `Post` and you auto-preload `posts` from `User`, you will end-up in a infinite loop and your application will stop working.

## **Route model binding**

When using route model binding, you cannot use `without`, `withOnly` and `withoutAny` methods in your controller. But, you can make use of [findForRequest](https://github.com/adonisjs/route-model-binding#change-lookup-logic) method.

```ts

// App/Models/User.ts

import { BaseModel, column, hasOne, HasOne, hasMany, HasMany } from '@ioc:Adonis/Lucid/Orm'

import { compose } from '@ioc:Adonis/Core/Helpers'

import { AutoPreload } from '@ioc:Adonis/Addons/AutoPreload'

import Profile from 'App/Models/Profile'

import Post from 'App/Models/Post'

class User extends compose(BaseModel, AutoPreload) {

  public static $with = ['posts', 'profile'] as const

  @column({ isPrimary: true })

  public id: number

  @column()

  public email: string

  @hasOne(() => Profile)

  public profile: HasOne

  @hasMany(() => Post)

  public posts: HasMany

  public static findForRequest(ctx, param, value) {

    const lookupKey = param.lookupKey === '$primaryKey' ? 'id' : param.lookupKey

    return this

      .without(['posts']) // ⬅ Do not auto-preload posts when using route model binding.

      .query()

      .where(lookupKey, value)

      .firstOrFail()

  }

}

```

## **Run tests**

```sh

npm run test

```

## **Author**

👤 **Oussama Benhamed**

* Twitter: [@Melchyore](https://twitter.com/Melchyore)

* Github: [@Melchyore](https://github.com/Melchyore)

## 🤝 **Contributing**

Contributions, issues and feature requests are welcome!
Feel free to check [issues page](https://github.com/Melchyore/adonis-auto-preload/issues). You can also take a look at the [contributing guide](https://github.com/Melchyore/adonis-auto-preload/blob/master/CONTRIBUTING.md).

## **Show your support**

Give a ⭐️ if this project helped you!



  



## 📝 **License**

Copyright © 2022 [Oussama Benhamed](https://github.com/Melchyore).


This project is [MIT](https://github.com/Melchyore/adonis-auto-preload/blob/master/LICENSE.md) licensed.