[jonathanhefner]

I created a gem which wraps all this up in a nice API: https://github.com/jonathanhefner/talent_scout

So the final code from the article would look like:

  class ProductSearch < TalentScout::ModelSearch
    criteria(:search) { |search| where("title ILIKE '%?%'", search) }

    criteria(:from_price) { |from_price| where("price > ?", from_price) }

    criteria(:to_price) { |to_price| where("price < ?", to_price) }

    criteria(:properties) { |properties| joins(:product_properties).where(property_id: properties) }

    criteria(:category_id) { |category_id| where(category_id: category_id) }

    order :price, default: :desc
  end

Brevity is an obvious benefit, but reliability even more so. For example, the code in the article has at least two major mistakes:

1) `from_price` will silently never be applied

2) `sort_type` and `sort_direction` defaults are mixed up and always nil, either of which will raise an exception, but only when the corresponding request params are omitted

Another benefit of using the gem: instances of the `ProductSearch` class from above can be used with the stock Rails form builder (i.e. `form_for` and `form_with model:`).