graphql-auto-transformer

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graphql-auto-transformer

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A custom transformer of the amplify-cli. It can control accessibility of auto generated fields.

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graphql-auto-transformer
========================

A custom transformer of the amplify-cli. It can control accessibility of auto generated fields.

```
directive @auto(creatable: Boolean = false, updatable: Boolean = false) on FIELD_DEFINITION
```

## Motivation

If you are familiar with amplify-cli, you know several fields of object are generated by some directives.
For example, `@model` generates `createdAt` and `updatedAt`, `@versioned` generates `version`, `@auth` generates `owner` and so on.
Currently, the official way to access these fields from GraphQL API is to define these types as nullable types.

```
type Post @model {
  id: ID!
  text: String
  createdAt: AWSDateTime
}
```

However above solution isn't ideal because users can modify `createdAt` at any time.

```
input CreatePostInput {
  id: ID
  text: String
  createdAt: AWSDateTime
}

input UpdatePostInput {
  id: ID!
  text: String
  createdAt: AWSDateTime
}
```

We want to strip `createdAt` field from `CreatePostInput` and `UpdatePostInput`.

What is worse, we cannot use nullable type as a part of a database index. So, we should write:

```
type Post
  @model
  @key(name: "byUser", fields: ["userId", "createdAt"]) {
    id: ID!
    userId: ID!
    text: String
    createdAt: AWSDateTime!
}
```

Predictabley, the result is bad.  https://github.com/aws-amplify/amplify-cli/issues/1657

## Usage

### 1. Install package

```
npm install graphql-auto-transformer -D
```

or

```
yarn add graphql-auto-transformer -D
```

### 2. Setup custom transformer

Edit `amplify/backend/api/<YOUR_API>/transform.conf.json` and append `"./graphql-auto-transformer"` to `transformers` field.

```
    "transformers": [
      "graphql-auto-transformer"
    ]
```

### 3. Use @auto directive

Append `@auto` to target fields.

```
type Post @model {
  id: ID!
  text: String
  createdAt: AWSDateTime! @auto
}
```

generates:

```
input CreatePostInput {
  id: ID
  text: String
}

input UpdatePostInput {
  id: ID!
  text: String
}
```

If you want to allow optional creation/update like `id` field, use `creatable` and `updatable` parameter.

```
type Post @model {
  id: ID!
  text: String
  createdAt: AWSDateTime! @auto(creatable: true)
}
```

generates:

```
input CreatePostInput {
  id: ID
  text: String
  createdAt: AWSDateTime
}

input UpdatePostInput {
  id: ID!
  text: String
}
```

## License

Fork of `graphql-versioned-transformer`

Apache-2.0

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