code: function (store, record, Model, json, handledRecords) {
      if (handledRecords.indexOf(record) === -1) {
        handledRecords.push(record);
        Model.eachRelationship(function (name, meta) {
          var related, fixtures, relatedTypeKey, ids;
          if (!meta.async && record[name]) {
            fixtures = Ember.A(this.fixturesForType(store, meta.type));
            ids = coerceId(record[name]);
            if (meta.kind === 'hasMany') {
              if (ids && ids.length) {
                related = fixtures.filter(function (r) {
                  return ids.indexOf(coerceId(r.id)) !== -1;
                });
              }
            }
            else if (meta.kind === 'belongsTo') {
              related = fixtures.find(function (r) {
                return coerceId(r.id) === ids;
              });
              if (related) {
                related = [related];
              }
            }
            if (related) {
              relatedTypeKey = pluralize(meta.type.typeKey);
              if (!json[relatedTypeKey]) {
                json[relatedTypeKey] = [];
              }
              related.forEach(function (record) {
                if (json[relatedTypeKey].indexOf(record) === -1) {
                  json[relatedTypeKey].push(record);
                }
                this.completeJsonForRecord(store, record, meta.type, json, handledRecords);
              }, this);
            }
          }
        }, this);
      }
    }
docs: Complete a record adding in the given json the related records which are not defined as async
  
  @method completeJsonForRecord
  @param {DS.Store} store
  @param {DS.Model} record
  @param {subclass of DS.Model} Model
  @param {Object} json
  @param {Array.<DS.Model>} handledRecords