How can I implement custom error handling in a Rails API?

How can I implement custom error handling in a Rails API?

You can create custom error classes and use rescue_from in your ApplicationController to handle specific errors.

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

Sure! Here's a simple example:

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

How do I use this custom error in my controller?

You can use it like this:

class UsersController < ApplicationController
  rescue_from NotFoundError, with: :render_not_found

  def show
    user = User.find(params[:id]) || raise(NotFoundError)
    render json: user
  end

  private

  def render_not_found
    render json: { error: 'User not found' }, status: :not_found
  end
end

What about handling validation errors?

For validation errors, you can create a custom error class for validation and handle it similarly in your controller.