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Discover how to efficiently validate two inputs in Laravel using a custom validation rule, ensuring your application remains robust and user-friendly.
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Validating Two Request Inputs Against a Single Column in Laravel: A Step-by-Step Guide

When developing applications with Laravel, you may encounter scenarios where you need to validate two separate inputs against a single database column. This is a common requirement, especially when dealing with resources that require a combination of parameters to ensure uniqueness. If you've found yourself stuck in a situation where you must validate both resource_name and permission_type before checking them against a combined value in the name column, you're in the right place!

The Challenge

In Laravel, validating inputs can often be straightforward, but when the validation depends on the combination of multiple inputs, it can become tricky. In your case, you want to ensure that a name is formed by concatenating resource_name and permission_type. The problem arises in that you need to validate both inputs prior to validating the concatenated result against the database.

Your objectives are:

Ensure resource_name is a required field and meets specific criteria (e.g., length, character type).

Ensure permission_type is also a required field.

Validate the combined result (resource_name.permission_type) against the name column in the permissions table.

The Solution

Here’s how you can handle this efficiently by using a custom validation rule along with hidden input fields in your form. We’ll break it down into clear steps.

Step 1: Create the Hidden Input

First, you’ll need to include a hidden input field in your form. This field will hold the concatenated name value, which is formed by resource_name and permission_type.

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By initializing this hidden field, you will allow the validation rules to trigger properly even when the value is not explicitly provided in the request.

Step 2: Update Your Form Request Validation Rules

Next, modify your Form Request class to include validation rules. Here’s how you can set it up:

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Step 3: Create the Custom Validation Rule

Now, you need to create the custom validator, UniqueTwoInputsInOneColumn. This rule checks if the combined input already exists in the database. Here’s a complete code snippet for this rule:

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Step 4: Testing Your Implementation

Initial Setup: Make sure your database has the necessary structure to test against.

Form Submission: Submit your form with valid resource_name and permission_type inputs.

Validation Feedback: Ensure that the validation works correctly and appropriate error messages are displayed when needed.

Conclusion

By following these steps, you can effectively validate two request inputs against a single column in Laravel, ensuring both robustness and user-friendliness in your applications. Custom validation rules offer the flexibility needed to cater to complicated validation scenarios that are common in modern web applications. Happy coding!