jsonapi-serializer - Return slug instead of id for relationship

 In the `jsonapi-serializer` library for serializing JSON API data, you can customize how relationships are represented, including returning the slug instead of the id for a relationship. You can achieve this by using the `keyForAttribute` and `relationshipLinks` options when defining your serializer.


Here's how you can return a slug instead of an id for a relationship using `jsonapi-serializer`:


Assuming you have a model with a relationship like this:


```javascript

// Model

{

  id: 1,

  name: "Example Model",

  slug: "example-model"

}

```


1. Define your serializer and specify how relationships should be serialized:


```javascript

const JSONAPISerializer = require("jsonapi-serializer").Serializer;


const serializer = new JSONAPISerializer("model", {

  attributes: ["name", "slug"], // Include the attributes you want

  keyForAttribute: "underscored", // You can customize the key format

  relationshipLinks: {

    // Customize the relationship links

    slug: (data) => `/models/${data.slug}`,

  },

});

```


2. Use the serializer to serialize your data:


```javascript

const data = {

  id: 1,

  name: "Example Model",

  slug: "example-model",

};


const serializedData = serializer.serialize(data);

console.log(serializedData);

```


The output will now have a "slug" attribute in the "model" relationship, and the links will be customized to use the slug:


```json

{

  "data": {

    "id": "1",

    "type": "model",

    "attributes": {

      "name": "Example Model",

      "slug": "example-model"

    },

    "relationships": {

      "slug": {

        "data": {

          "type": "model",

          "id": "example-model"

        },

        "links": {

          "self": "/models/example-model"

        }

      }

    }

  }

}

```


By customizing the `relationshipLinks` option, you can control the links for the relationship and return the slug instead of the id.

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