How can I implement custom exceptions in a Rails API?

How can I implement custom exceptions in a Rails API?

You can create custom exception classes in your Rails API by inheriting from StandardError. Then, you can rescue these exceptions in your application controller.

Can you show me an example of a custom exception class?

Sure! Here's a simple example:

class NotFoundError < StandardError
  def initialize(msg="Resource not found")
    super
  end
end

How do I handle this exception in my controller?

You can rescue the exception in your controller like this:

class ApplicationController < ActionController::API
  rescue_from NotFoundError, with: :handle_not_found

  private

  def handle_not_found
    render json: { error: 'Resource not found' }, status: :not_found
  end
end

What about logging these exceptions?

You can log exceptions by adding a logging statement in your rescue method. For example, use Rails.logger.error to log the error message.