ember.js - Ember 表与 Ember 模型/Ember 数据集成

Question

我正在尝试将 ember-models 链接到 ember-table，以从服务器提取分页记录，并在向下滚动时将它们添加到表中。

我可以通过请求我的 api url 和页码来让它工作，就像 http://addepar.github.io/ember-table/ 上的 ajax 示例一样。但我不知道如何将它与 ember-model 集成来创建 ember 对象，然后将它们添加到表中。

这是我的代码，用于发出 ajax 请求并添加到表中。谁能告诉我如何更改它以使用 ember-model/ember-data 代替。

App.TableAjaxExample = Ember.Namespace.create()

App.TableAjaxExample.LazyDataSource = Ember.ArrayProxy.extend

  createGithubEvent: (row, event) ->

    row.set 'id',       event.id
    row.set 'name',  event.name
    row.set 'isLoaded',   yes

  requestGithubEvent: (page) ->

    content = @get 'content'
    start   = (page - 1) * 30
    end     = start + 30
    per_page = 40
    # something like this ???
    #App.Detail.find(type: 'companies', page: page, per_page: per_page).on 'didLoad', ->
    url = "http:/myurl.dev/admin/details.json?type=companies&page=#{page}&per_page=30"
    Ember.$.getJSON url, (json) =>
      json.details.forEach (event, index) =>
        row = content[start + index]
        @createGithubEvent row, event
    [start...end].forEach (index) ->
      content[index] = Ember.Object.create eventId: index, isLoaded: no

  objectAt: (index) ->

    content = @get 'content'
    #if index is content.get('length') - 1
    #  content.pushObjects(new Array(30))
    row = content[index]
    return row if row and not row.get('error')
    @requestGithubEvent Math.floor(index / 30 + 1)
    content[index]

App.TableAjaxExample.TableController =
Ember.Table.TableController.extend

  hasHeader: yes
  hasFooter: no
  numFixedColumns: 0
  numRows: 21054
  rowHeight: 35

  columns: Ember.computed ->

    columnNames = ['id', 'name']
    columns = columnNames.map (key, index) ->
      Ember.Table.ColumnDefinition.create
        columnWidth: 150
        headerCellName: key.w()
        contentPath: key

    columns
  .property()

  content: Ember.computed ->
    App.TableAjaxExample.LazyDataSource.create

      content: new Array(@get('numRows'))
  .property 'numRows'

有可能吗，或者这会减慢速度吗？

感谢您的帮助。瑞克

Answer 1

这是我使用 Ember Data 和 RESTAdapter 得到的 JSBin:http://jsbin.com/eVOgUrE/3/edit

它的工作方式与 AJAX 加载示例非常相似，但使用 Ember Data 来加载数据。我创建了一个 RowProxy 对象，该对象立即返回到 Ember 表，以便它可以渲染一行。 Ember Data 加载充满数据的页面后，它会在更新 View 的 RowProxy 上设置 object 属性。

window.App = Ember.Application.create();

// The main model that will be loaded into Ember Table 
App.Gallery = DS.Model.extend({
  name: DS.attr('string'),
  smallUrl: DS.attr('string')
});

// This is a temporary buffer object that sits between
// Ember Table and the model object (Gallery, in this case).
App.RowProxy = Ember.Object.extend({
  object:null,
  getObjectProperty : function(prop){
    var obj = this.get('object');
    if(obj){ console.log(prop + " : " + obj.get(prop)); }
    return obj ? obj.get(prop) : 'loading...';
  },
  isLoaded : function(){ return !!this.get('object'); }.property('object'),
  name : function(){ return this.getObjectProperty('name'); }.property('object.name'),
  id : function(){ return this.getObjectProperty('id'); }.property('object.id'),
  smallUrl : function(){ return this.getObjectProperty('smallUrl'); }.property('object.smallUrl')
});

App.ApplicationController = Ember.Controller.extend({
  tableController: Ember.computed(function() {
    return Ember.get('App.TableAjaxExample.TableController').create({
      // We need to pass in the store so that the table can use it
      store : this.get('store')
    });
  })
});

App.TableAjaxExample = Ember.Namespace.create();

App.TableAjaxExample.ImageTableCell = Ember.Table.TableCell.extend({
  templateName: 'img-table-cell',
  classNames: 'img-table-cell'
});

App.TableAjaxExample.LazyDataSource = Ember.ArrayProxy.extend({
  requestPage : function(page){
    var content, end, start, url, _i, _results,
      _this = this;

    content = this.get('content');
    start = (page - 1) * 3;
    end = start + 3;

    // Find galleries and then update the RowProxy to hold a gallery as 'object'
    this.get('store').find('gallery',{page_size:3,page:page}).then(function(galleries){
      return galleries.forEach(function(gallery, index) {    
        var position = start + index;
        content[position].set('object',gallery);
      });  
    });

    // Fill the 'content' array with RowProxy objects
    // Taken from the 'requestGithubEvent' method of the original example
    return (function() {
      _results = [];
      for (var _i = start; start <= end ? _i < end : _i > end; start <= end ? _i++ : _i--){ _results.push(_i); }
      return _results;
    }).apply(this).forEach(function(index) {
      return content[index] = App.RowProxy.create({
        index: index
      });
    });
  },

  objectAt: function(index) {
    var content, row;
    content = this.get('content');
    row = content[index];
    if (row && !row.get('error')) {
      return row;
    }
    this.requestPage(Math.floor(index / 3 + 1));
    return content[index];
  }
});

App.TableAjaxExample.TableController = Ember.Table.TableController.extend({
  hasHeader: true,
  hasFooter: false,
  numFixedColumns: 0,
  numRows: 19,
  rowHeight: 35,
  columns: Ember.computed(function() {
    var avatar, columnNames, columns;

    avatar = Ember.Table.ColumnDefinition.create({
      columnWidth: 80,
      headerCellName: 'smallUrl',
      tableCellViewClass: 'App.TableAjaxExample.ImageTableCell',
      contentPath: 'smallUrl'
    });
    columnNames = ['id', 'name'];
    columns = columnNames.map(function(key, index) {
      return Ember.Table.ColumnDefinition.create({
        columnWidth: 150,
        headerCellName: key.w(),
        contentPath: key
      });
    });
    columns.unshift(avatar);
    return columns;
  }).property(),
  content: Ember.computed(function() {
    return App.TableAjaxExample.LazyDataSource.create({
      content: new Array(this.get('numRows')),
      store : this.get('store')
    });
  }).property('numRows')
});


App.ApplicationAdapter = DS.RESTAdapter.extend({
  host: 'http://files.cloudhdr.com/api/v1/public',
  // This is here to use underscores in API params
  pathForType: function(type) {
    var underscored = Ember.String.underscore(type);
    return Ember.String.pluralize(underscored);
  }
});

// Everything below is all here to use underscores in API params.
// You may or may not need this.

DS.RESTSerializer.reopen({
  modelTypeFromRoot: function(root) {
    console.log("modelTypeFromRoot " + root);
    var camelized = Ember.String.camelize(root);
    return Ember.String.singularize(camelized);
  }
});

App.ApplicationSerializer = DS.RESTSerializer.extend({
  normalize: function(type, hash, property) {
    var normalized = {}, normalizedProp;

    for (var prop in hash) {
      if (prop.substr(-3) === '_id') {
        // belongsTo relationships
        normalizedProp = prop.slice(0, -3);
      } else if (prop.substr(-4) === '_ids') {
        // hasMany relationship
        normalizedProp = Ember.String.pluralize(prop.slice(0, -4));
      } else {
        // regualarAttribute
        normalizedProp = prop;
      }

      normalizedProp = Ember.String.camelize(normalizedProp);
      normalized[normalizedProp] = hash[prop];
    }

    return this._super(type, normalized, property);
  }
});