Simple hash conditions for columns in model table.

gistfile1.rb

sql = '1 = 1'
values = {}

if params[:foo].present?
  sql << 'AND foo >= :foo' 
  values[:foo] = params[:foo]
end

if params[:bar].present?
  sql << 'AND bar < :bar' 
  values[:bar] = params[:bar]
end

Homage.paginate(
 ...
 :conditions => [sql, values]
)