Add custom property and resolver in Laravel Lighthouse query

Best Answer

Level 58

To add a custom property and resolver in a Laravel Lighthouse query, you can follow these steps:

Define the Custom Property in Your GraphQL Schema: First, you need to define the validate property in your GraphQL schema. You can do this by adding it to your Customer type definition.
```
type Customer {
    id: ID!
    name: String!
    identification_number: String!
    validate: Boolean!
}
```

Create a Resolver for the Custom Property: Next, you need to create a resolver that will handle the logic for the validate property. This resolver will use the identification_number to make an API call and return the validation result.

Create a new resolver class, for example, CustomerValidator.php:

namespace App\GraphQL\Resolvers;

use App\Models\Customer;

class CustomerValidator
{
    public function validate(Customer $customer)
    {
        // Replace this with your actual API call logic
        $identificationNumber = $customer->identification_number;
        $isValid = $this->callExternalApi($identificationNumber);

        return $isValid;
    }

    private function callExternalApi($identificationNumber)
    {
        // Simulate an API call
        // In a real scenario, you would use something like Guzzle to make the HTTP request
        // and process the response accordingly.
        return $identificationNumber === 'valid_id';
    }
}

Register the Resolver in Your GraphQL Schema: You need to tell Lighthouse to use your custom resolver for the validate field. You can do this by using the @field directive in your schema.
```
type Customer {
    id: ID!
    name: String!
    identification_number: String!
    validate: Boolean! @field(resolver: "App\\GraphQL\\Resolvers\\CustomerValidator@validate")
}
```
Update Your GraphQL Query: Now, you can query the validate property along with other properties of the Customer model.
```
query {
    customer(id: 1) {
        id
        name
        identification_number
        validate
    }
}
```
Test Your Implementation: Finally, test your implementation by running the GraphQL query and ensuring that the validate property is correctly resolved based on the identification_number.

By following these steps, you can add a custom property to your GraphQL query in Laravel Lighthouse and resolve it using an API call.