WIP: Attempt at fixing the problem in ember data where creating multiple new records at once fails when one new record has a 'belongsTo' relationship to another. This approach is based around applying observers on the ids of records that other records 'belongTo' and only saving them when those records are saved and an id is returned from the ser…

ember data dependent createRecords

createRecords: function(store, type, records) {
    var adapter = this, serializer = this.serializer, initialRecordsToCreate = [];

    if (get(this, 'bulkCommit') === false) {

      records.forEach(function(record) {

        var deferSave = false

        record.eachRelationship(function(name, relationship) {
          var key = serializer._keyForBelongsTo(record.constructor, name),
              child, createDependentRecords;

          if (relationship.kind === 'belongsTo') {
            if (!serializer.embeddedType(type, name)) {
              child = get(record, relationship.key);

              createDependentRecords = function() {
                adapter.createRecords(store, type, [record]);
                child.removeObserver('id', createDependentRecords);
              };

              if(child && !get(child, 'id')) {
                child.addObserver('id', adapter,  createDependentRecords);
                deferSave = true;
              }
            }
          }
        }, this);

        if(!deferSave) {
          initialRecordsToCreate.push(record);
        }

      });
      return this._super(store, type, initialRecordsToCreate);
    }

    var root = this.rootForType(type),
        plural = this.pluralize(root);

    var data = {};
    data[plural] = [];
    records.forEach(function(record) {
      data[plural].push(this.serialize(record, { includeId: true }));
    }, this);

    return this.ajax(this.buildURL(root), "POST", {
      data: data
    }).then(function(json) {
      adapter.didCreateRecords(store, type, records, json);
    }).then(null, DS.rejectionHandler);
  },