What are some examples of using lambda functions in Rails?

What are some examples of using lambda functions in Rails?

Lambda functions in Rails are anonymous functions that can be used for various purposes. For example, you can use them for callbacks, scopes, or even as arguments to methods. Would you like to see a specific example?

Yes, please provide an example of a lambda function used in a Rails model.

Sure! In a Rails model, you can define a scope using a lambda like this: scope :active, -> { where(active: true) }. This allows you to easily query for active records.

That's helpful! Can you give me another example, perhaps in a controller?

Absolutely! In a controller, you might use a lambda to filter parameters: params.require(:user).permit(:name, :email).tap { |user_params| user_params[:role] = 'guest' if user_params[:role].blank? }. This ensures a default role is set.