Array of pointers in Parse.com using REST API

Question

I have a an object 'Post' which can have many 'Comments'. I want to add these comment objects (pointers) to an array in Post.

Currently I have added them in the following way using 'PUT':

{
  "comments": {
      "__op": "AddUnique",
      "objects": {
          "__type": "Pointer",
          "className": "Comment",
          "objectId": comment.commentId
      }
    }
  };

When I look in the object browser at the column defined as 'Array' in the 'Post' object I see it represented in the following way:

[
    {
        "$each": {
            "__type": "Pointer",
            "className": "Comment",
            "objectId": "FuH4dAgSfJ"
        }
    },
    {
        "$each": {
            "__type": "Pointer",
            "className": "Comment",
            "objectId": "ogxH4RjcJQ"
        }
    },
    {
        "$each": {
            "__type": "Pointer",
            "className": "Comment",
            "objectId": "bPECgp3o9D"
        }
    }
]

What am I doing wrong here?

LK__ · Accepted Answer · 2014-03-11 22:39:21Z

3

The answer was that the syntax I used was wrong. Correct syntax should be (array syntax was missing within object):

{
  "comments": {
      "__op": "AddUnique",
      "objects": [
          {
              "__type": "Pointer",
              "className": "Comment",
              "objectId": comment.commentId
          }
      ]
    }
  };

answered Mar 11, 2014 at 22:39

LK__

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1 Comment

Abhinav Gujjar Over a year ago

So - how do you retrieve these pointed to objects once they are in an array ? I have a similar requirement

Marius Waldal · Accepted Answer · 2014-03-06 14:18:05Z

0

I think AddUnique is used for adding objects to an array stored in parse.

Try the same with AddRelation instead.

answered Mar 6, 2014 at 14:18

Marius Waldal

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2 Comments

LK__ Over a year ago

"AddUnique is used for adding objects to an array stored in parse" - as far as I understand, this is exactly what I am trying to do, no? I am confused here :-)

Marius Waldal Over a year ago

Hmm, no. You are not adding objects to an array, you are adding pointers to objects of another class. Go here and scroll down to "Relations": parse.com/docs/rest#objects-types

Robert Rowntree · Accepted Answer · 2014-03-06 23:45:47Z

hmmm "POST.comments" should be an array with just pointer entries and NOT with that "$each".

I use pointers and can copy a sample entry in the pointer col from the data browser containing similar pointer array .

[{"_type":"Pointer","className":"Pages","objectId":"SFHR2SsEby"},{"_type":"Pointer","className":"Pages","objectId":"X5YC0BROWT"},{"_type":"Pointer","className":"Pages","objectId":"4HuMAAt0nG"},{"_type":"Pointer","className":"Pages","objectId":"a5cesZeYzi"},{"_type":"Pointer","className":"Pages","objectId":"RZQ0vcgctS"},{"_type":"Pointer","className":"Pages","objectId":"hPbHjpl43p"},{"_type":"Pointer","className":"Pages","objectId":"FAPI5PEwmb"},{"_type":"Pointer","className":"Pages","objectId":"r5tYGhZIOE"}]

above sample from "Books" class where there is a "pages" property thats an array of pointers like you mean to have. In row 1, in the Pages column, next to the property name ,in grey there appears the label "Array" to declare the type of the column.

Maybe prior to when you started trying to use array of pointers in the "comments" field, you assigned some other data type to 'comments' that had the effect of assigning a diff native type to the column ( NOT an ARRAY ). Once typed , i dont think you can overload to array....

Just make a new field like "comments-2" and load the array of pointers there and see if you get a diff result.

OR a wild guess that your process is in some loop construct thats popping the extra "$each" property in front of the normal array element.

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