def search
    unless params[:order]
      params[:order] = 'created_at'
    end

    cond = ["1=1"]
    if not (params[:filename] ||= nil).to_s.empty?
      cond[0] << " AND filename LIKE ?"
      cond << "%" + params[:filename] + "%"
    end
    if not (params[:created_at_min] ||= nil).to_s.empty?
      cond[0] << " AND created_at > ?"
      cond << params[:created_at_min]
    end
    if not (params[:created_at_max] ||= nil).to_s.empty?
      cond[0] <<  " AND created_at < ?"
      cond << params[:created_at_max]
    end
    if not (params[:location_min] ||= nil).to_s.empty? and not (params[:location_max] ||= nil).to_s.empty?
      cond[0] << " AND wgs84location && ?::box3d"
      cond << "BOX3D(" +params[:location_min] +", " + params[:location_max] +")"
    end

    @order = params[:order]
    @condition = cond
    @result_pages, @results = paginate(Image, :per_page => 5, :select => "id, filename, created_at, wgs84location", :order => params[:order] +" DESC", :conditions => cond)
  end