How to retrieve the parent key name from it's child key?

Question

In this case, I want to retrieve the m1 key by referring to it's child key with the value of amoxicillin from firebase. I haven't tried to code it because i don't know where to begin.

{
  "Medicines" : {
    "m1" : {
      "class" : "antibiotic",
      "name" : "amoxcillin"
    },
    "m2" : {
      "class" : "analgesic",
      "name" : "paracetamol"

Possible duplicate of [How to iterate over a JSONObject?](https://stackoverflow.com/questions/9151619/how-to-iterate-over-a-jsonobject) — denvercoder9, Mar 04 '18 at 15:57

denvercoder9 · Answer 1 · 2018-03-04T15:56:48.173

0

Let's say you have an array of medicines:

Medicine[] medicines

You could iterate over each object in it and check if the class is amoxicillin or not:

for (int i = 0; i < medicines.length; i++) {
    Medicine medicine = medicines[i];

    if (medicine.getClass().equals("amoxicillin")) {
        // do smth here.. add the medicine to a separate array
        // or do smth with the index
        // for your case you should iterate over the jsonObject
        // and catch the key here
    }
}

edited Mar 04 '18 at 15:56

answered Mar 04 '18 at 15:41

denvercoder9

2,979
3
28
41

I have edited my question just now, i forgot adding the db structure – Mr. Benbenbenbenben Mar 04 '18 at 15:54
My answer is still more or less the same. Read the comments in the code. You need to iterate over the jsonObject and get the key when class matches – denvercoder9 Mar 04 '18 at 15:57
Uhmm the json is actually from firebase, i just can't add an image to illustrate clearly, my bad. – Mr. Benbenbenbenben Mar 04 '18 at 16:28

score 0 · Answer 2 · answered Mar 04 '18 at 15:45

0

Have a field for the parent in the child class(Model) then ie

    parent : { 
           child : { 
                  ...
                  parent: "parent_key" 
                  ...
                   }
     }

answered Mar 04 '18 at 15:45

Daniel Dube

31
2

I have edited my question just now, i forgot adding the db structure – Mr. Benbenbenbenben Mar 04 '18 at 15:52
{ "Medicines" : { "m1" : { "class" : "antibiotic", "name" : "amoxcillin", "parent" : "m1" }, "m2" : { "class" : "analgesic", "name" : "paracetamol", "parent" : "m2" – Daniel Dube Mar 04 '18 at 16:03

How to retrieve the parent key name from it's child key?

2 Answers2