将集合而不是数组传递给 fetch().then() 回调

Question

从服务器获取数据的模块和returns一个Promise

MedicineManager.module("Entities", function (Entities, MedicineManager, Backbone, Marionette, $, _) {
    Entities.Suggestion = Backbone.Model.extend({
        default: {
            suggestion: ""
        }
    });

    Entities.SuggestionCollection = Backbone.Collection.extend({
        model: Entities.Suggestion,
        comparator: "suggestion"
    });

    var API = {
        getSuggestions: function (medicine) {
            var suggestions = new Entities.SuggestionCollection();
            suggestions.url="/medicine_suggestions/?id=" + medicine;
            return suggestions.fetch();
        }
    };

    MedicineManager.reqres.setHandler("suggestion:entities", function (medicine) {
        return API.getSuggestions(medicine);
    });

});

调用上述模块获取数据的模块

MedicineManager.module("MedicinesApp.Suggest", function (Suggest, MedicineManager,
    Backbone, Marionette, $, _) {


            MedicineManager.request("suggestion:entities", "paracetamol").then(function (medicines) {


            });
});

我如何获取集合而不是数组作为 then() 中回调函数的参数，因为传递给回调的 medicines 参数在获取值后给出了一个数组。

Answer 1

将成功回调与选项一起传递，backbone:

将使用集合作为第一个参数调用它

Entities.SuggestionCollection = Backbone.Collection.extend({
  model: Entities.Suggestion,
  comparator: "suggestion"
});

var API = {
  getSuggestions: function(medicine, options) {
    var suggestions = new Entities.SuggestionCollection([],{
      url : "/medicine_suggestions/?id=" + medicine
    });
    return suggestions.fetch(options);
  }
};
 MedicineManager.reqrest.setHandler("suggestion:entities",API.getSuggestions);

你可以像这样使用：

MedicineManager.request("suggestion:entities", "paracetamol", {
  success: function(medicines) {}
});

Answer 2

而不是直接返回 xhr 承诺，filter it via .then 将您的 collection 设置为承诺值：

var API = {
    getSuggestions: function (medicine) {
        var suggestions = new Entities.SuggestionCollection();
        suggestions.url="/medicine_suggestions/?id=" + medicine;
        return suggestions.fetch().then(function() {
            return suggestions;
        });
    }
};

MedicineManager.request(...).then(function (medicines) { }); 中的第一个参数 (medicines) 将是您的 collection。

将集合而不是数组传递给 fetch().then() 回调

pass a collection instead of array to fetch().then() callback

javascript

promise

deferred

backbone.js

marionette