Javascript 主干：必须指定“url”属性或函数

我正在获取一些数据并用它创建一个集合，如下所示：

reader: function(fileName){
        console.log(fileName);
        _this = this;
        $.ajax({
            type: "GET",
            url: "some/rest/url",
            data: {"fileName": fileName},
            success: function(response) {
                console.log("reader");
                console.log(response);
                importCollection = new ImportCollection(response);
                importCollection.sync();
            }
        });
    },

我的收藏如下：

define([
        "underscore",
        "backbone",
        "models/import",
    "helpers/localstorage"
   ],
function(_, Backbone, ImportModel, localstorage) {

return Backbone.Collection.extend({

    model: ImportModel,
    url: "some/rest/url",

    projectId: null,

    fetch: function(options){
        //TODO remove this hardcode
        console.log(options.url);
        this.url = this.url + "/PU000101/reader";

        Backbone.Collection.prototype.fetch.call(this,options);
    }

});

});

define([
"models/base"

我的模型是这样的：

define([
        "underscore",
        "backbone",
        "models/import",
    "helpers/localstorage"
   ],
function(_, Backbone, ImportModel, localstorage) {

return Backbone.Collection.extend({

    model: ImportModel,
    url: "some/rest/url",

    projectId: null,

    fetch: function(options){
        //TODO remove this hardcode
        console.log(options.url);
        this.url = this.url + "/PU000101/reader";

        Backbone.Collection.prototype.fetch.call(this,options);
    }

});

});

define([
"models/base"

],， functionBaseModel{

return BaseModel.extend({

    idAttribute: "id",
    url: "some/rest/url",


});

});

理想情况下，我希望在同步时发生的是，集合会将其所有模型发布到后端进行验证，但我一直遇到这样的错误：必须指定url属性或函数如果直接调用sync，则需要传入它期望的参数。现在，您没有向importCollection传递任何内容.sync调用，因此当主干尝试解析此处要使用的url时

if (!options.url) {
  params.url = _.result(model, 'url') || urlError();
}

它找不到url，将执行urlError。您需要调用重载的fetch方法，或者在同步调用中传递正确的参数。请注意，fetch for Backbone.Collection通过以下方式调用同步：

return this.sync('read', this, options);