extend record array for pagination/infinite scroll

pagination-patch-recordarray.js

DS.AdapterPopulatedRecordArray.reopen({
  queryPageParam: 'page_number',
  metaPageParam: 'currentPage',
  metaTotalPagesParam: 'totalNumPages',
  isPaginating: false,

  nextPage: function (append) {
    var meta = this.get('meta');
    if(meta[this.get('metaPageParam')]<meta[this.get('metaTotalPagesParam')]-1)
      return this.getPage(meta[this.get('metaPageParam')] + 1, append);
  },

  getPage: function (pageNumber, append) {
    if(this.get('isPaginating')) {
      return false;
    }

    var self = this;
    var query = JSON.parse(JSON.stringify(this.get('query'))); // Ugly way of cloning

    append = append===undefined?true:false;
    query[this.get('queryPageParam')] = pageNumber;

    this.store.findQuery(this.get('type'), query).then(function(nextRecordArray) {
      self.loadPaginatedRecords(nextRecordArray, append);
    });

    this.set('isPaginating', true);
  },

  loadPaginatedRecords: function(nextRecordArray, append) {
    if(!append) {
      this.get('content').forEach(function(record) {
        this.removeRecord(record);
      }, this);
    }

    nextRecordArray.get('content').forEach(function(record) {
      this.get('content').pushObject(record);
      this.manager.recordArraysForRecord(record).add(this);
    }, this);

    this.set('meta', nextRecordArray.get('meta'));
    this.set('isPaginating', false);
    nextRecordArray.destroy();
  }
});

DS.PromiseArray.reopen({
  nextPage: function() {
    return this.get('content').nextPage.apply(this.get('content'), arguments);
  },
});