CODEWITHSUNDEEP
springspring-mvc
Chandan
Chandan

Reputation: 229

Spring RedirectAttributes

How can we use spring RedirectAttributes to add a attribute with same name and multiple values, like if I have HTTP request parameter say place=london&place=paris, and I want to redirect these "place" params in a redirectAttribute.

redirectAttribute.addAttribute("place",places??)

I don't want to use flash attributes.

Is it possible?

Upvotes: 1

Views: 1599

Answers (2)

Pablo Tirado
Pablo Tirado

Reputation: 81

You can use the mergeAttributes method:

String[] attrArray = {"london", "paris"};
Map<String, String[]> attrMap = new HashMap<>();
attrMap.put("place", attrArray);
redirectAttrs.mergeAttributes(attrMap);

This will create a URL with request parameters like this: place=london%2Cparis (where %2C is the ASCII keycode in hexadecimal for a comma), which is equivalent to place=london&place=paris.

Upvotes: 0

Cameron
Cameron

Reputation: 61

I'm really frustrated that there doesn't appear to be a cleaner solution, but I faced the same problem and ended up doing:

((HashMap<String, Object>) redirectAttrs).putIfAbsent("place", 
                                                      Arrays.asList("london", "paris"));

This works because it bypasses the way that RedirectAttributes normally converts everything to a String when you add it, since they forgot to override the putIfAbsent method...

It works (for now), but I certainly don't recommend it.

Upvotes: 1

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