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Learn how to seamlessly inject the current DateTime into your Laravel Lighthouse mutations with a custom scalar type.
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Injecting the Current DateTime into Laravel Lighthouse Mutations

Laravel Lighthouse is a powerful GraphQL server for Laravel, enabling you to create and manage GraphQL APIs with ease. One common challenge developers face is how to inject dynamic values, like the current date and time, into mutations. In this guide, we will explore how to achieve just that by creating a custom scalar type in Laravel Lighthouse.

Understanding the Problem

When working with GraphQL mutations in Laravel Lighthouse, there are often situations where you want to provide default values based on the current time. For instance, when inserting or updating a customer record, you might want to automatically include a timestamp for when the customer was added or updated – a feature that enhances data consistency and reliability. The challenge is to find a straightforward way to inject this dynamic now datetime into the mutation without manually passing it each time.

Crafting the Solution

To solve this problem, we'll create a custom scalar type that allows you to specify a default value for your mutation inputs. This custom scalar will recognize when "now" is passed and replace it with the current date and time. Here’s how to create the custom scalar step by step:

Step 1: Define Your Custom Scalar

We will create a new scalar class that handles our custom logic. This class will implement methods to serialize, parse values, and parse literals.

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In this code snippet, we are defining a class CustomValue that extends the ScalarType. It provides basic functions to serialize and parse input values, while also handling the now case specifically.

Step 2: Update Your GraphQL Schema

Now that we have our custom scalar ready, let's use it in our GraphQL schema. You will need to update the input type to incorporate the custom scalar:

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In this example, date can either be explicitly set or default to the current datetime if the value "now" is provided.

Step 3: Use the Custom Scalar in Your Mutation

Once the custom scalar is implemented and the schema is updated, you can use it in your mutation calls. Here is how you could structure your mutation to create or update a customer:

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When you execute this mutation, the date field will automatically be set to the current datetime, thanks to the logic defined in the CustomValue scalar.

Conclusion

Injecting the current datetime into your Laravel Lighthouse mutations is made easy by creating a custom scalar type. This approach not only automates the input process but also enhances the scalability of your GraphQL API. With just a few lines of code, you can ensure that the date field always reflects the accurate time, streamlining the process for developers. Try implementing this in your Laravel application today and see how it simplifies your data handling!