Create new object with relation in Parse with React Native

Question

There seems to be no documentation on how to create a new Parse Object with a Relation with Parse-ReactNative using ParseReact.Mutation.Create. I resorted to this:

function createRow(relatedObject, data) {
  ParseReact.Mutation.Create('objectClass', data)
    .dispatch()
    .then(function(newRow) {
      ParseReact.Mutation.AddRelation(newRow, 'relationColumn', relatedObject)
    });
}

Which is creating the new objectClass Parse Object, but the column relationColumn doesn't display the relation with the given relatedObject.

Any idea on how this can be done, preferably in one query with the ParseReact.Mutation.Create?

Kevin Zhao · Accepted Answer · 2015-10-24 22:59:51Z

2

+100

so my code is working with ParseReact.Mutation.AddRelation, here it is:

ParseReact.Mutation.AddRelation({
                          "className": newRow.className,
                          "objectId": newRow.id.objectId}, 'groceryRequestRelation',[{
                          "__type":"Pointer",
                          "className":"ClassThePointerPointingTo",
                          "objectId":"ObjectIdOfClassThePointerIsPointingTo"
                        }]).dispatch()

@naoisegolden you didn't put .dispatch() at the end of the AddRelation so that might be an issue.

Another thing that took me forever to figure out was I was using the wrong objectId within my AddRelation, I should be using the objectId of the class that the pointer is pointing to, but I was using the objectId of the class that the relation belongs to...

If this still doesn't work for you, try the REST way to do this:

var data = {
      "groceryRequestRelation":{"__op":"AddRelation",
      "objects":
      [{
        "__type":"Pointer",
        "className":"ClassThePointerIsPointingTo",
        "objectId":"ObjectIdOfClassThePointerIsPointingTo"
      }
      ]
    }
  };

        var url = "https://api.parse.com";
        url += "/1/classes/Classname/objectId";
        fetch(url, {
            method: 'put',
            headers: {
                'Accept': 'application/json',
                'X-Parse-Application-Id': PARSE_APP_ID,
                'X-Parse-REST-API-Key': PARSE_REST_KEY,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        })
        .then((response) => {
          console.log("inside add relation rest")
          console.log(response);
          return response.json();
        })
        .then((responseText) => {
          console.log(responseText);
        })
        .catch((error) => {
          console.warn(error);
        })
        .done();

answered Oct 24, 2015 at 22:59

Kevin Zhao

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3 Comments

mutp Over a year ago

Adding dispatch() for AddRelation did the trick for me. Thanks Kevin!

mutp Over a year ago

You can also pass an array of objects as the last parameter in AddRelation. For ex. you can pass an array of User objects if you want to add that relation to a class.

Kevin Zhao Over a year ago

@muttapp np, glad to help!

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