scope_builder_scope.rb

class ProductSearch < ScopeBuilder::Scope
  param :name, :string
  param :category, :integer
  param :status, :string

  order_by :name, :created_at

  private

  def apply_name_param(scope, value)
    scope.search_by_name(value)
  end

  def apply_category_param(scope, value)
    scope.where(category_id: value)
  end

  def apply_status_param(scope, value, context)
    scope.where(status: value) if context[:user].admin?
  end

  def prepare(scope, params, context)
    scope.where('deleted_at IS NULL')
  end
end

scope = ProductSearch.new(Product, user: user)

result = scope.build(name: "iPhone", status: "available", order: ["name", "created_at"], dir: "desc")
# result.valid? # => true | false
# result.errors # => ActiveModel::Errors
# result.params # => ProductSearch::Params

render json: { data: result.scope }