graphql-assert-transformer

graphql-assert-transformer
========================

A custom transformer of the amplify-cli. It can validate fields.

``directive @assert(condition: String!, message: String, type: String) on FIELD_DEFINITION`

`Usage`

`$3`

`npm install graphql-assert-transformer -D`

or

`yarn add graphql-assert-transformer -D`

`$3`

Edit amplify/backend/api//transform.conf.json and append "./graphql-assert-transformer" to transformers field.

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

`$3`

Append @assert to target fields.

`type Post @model { id: ID! title: String @assert(condition: ".length() > 3 && .matches(\"[a-zA-Z0-9]+\")") text: String @assert(condition: ".length() > 10") episode: Int @assert(condition: ". % 2 == 0") }`

You can refer the field itself by .. This transformer doesn't check type soundness, writing correct boolean expressions are up to you.

#### 3.1 How it works

AppSync uses Apache Velocity for resolver mapping. It supports basic operators like logical operators. Besides, It supports Java methods. Thus, you can do whatever you want. But I'm not sure which Java version is used inside AppSync, you may find missing methods.

| GraphQL Type | Java Class | | ------------ | ----------------------------------------------------------------------------------------- | | ID | java.lang.String | | String | java.lang.String | | Int | java.lang.Integer | | Float | java.lang.Double | | Boolean | java.lang.Boolean | | Array | java.util.ArrayList | | Enum | java.lang.String |

`$3`

This step isn't necessary once https://github.com/aws-amplify/amplify-cli/pull/3236 merged.

`export NODE_PATH=./node_modules``

License

Fork of https://github.com/amazon-archives/aws-reinvent-2019-mobile-workshops/tree/master/MOB405/01%20-%20Finished

ISC

graphql-assert-transformer
========================

A custom transformer of the amplify-cli. It can validate fields.

``directive @assert(condition: String!, message: String, type: String) on FIELD_DEFINITION`

`Usage`

`$3`

`npm install graphql-assert-transformer -D`

or

`yarn add graphql-assert-transformer -D`

`$3`

Edit amplify/backend/api//transform.conf.json and append "./graphql-assert-transformer" to transformers field.

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

`$3`

Append @assert to target fields.

You can refer the field itself by .. This transformer doesn't check type soundness, writing correct boolean expressions are up to you.

#### 3.1 How it works

`$3`

This step isn't necessary once https://github.com/aws-amplify/amplify-cli/pull/3236 merged.

`export NODE_PATH=./node_modules``

License

Fork of https://github.com/amazon-archives/aws-reinvent-2019-mobile-workshops/tree/master/MOB405/01%20-%20Finished

ISC