on('input change', ....)on('input change keyup', function(event) {
if (event.type == 'keyup' && event.which != 8 && event.which != 46)
return true;
....
})
(:sybmol.to_s << 1.to_s).to_sym
(:sybmol.to_s << "1").to_sym
(:sybmol.to_s + "1").to_sym
params.require(:model).permit(:address => [])pp params[:address]['1'] # => 'asdf'
# "address"=>{"1"=>"asdf"}
