class Pagy

def setup_vars(name_min)

Setup and validates the passed vars: var must be present and value.to_i must be >= to min 
def setup_vars(name_min)
  name_min.each do |name, min|
    raise VariableError.new(self, name, ">= #{min}", @vars[name]) \
          unless @vars[name] && instance_variable_set(:"@#{name}", @vars[name].to_i) >= min
  end
end