Ember.RSVP.所有错误数组方法都必须提供一个数组

Question

从discuss.emberjs.com 交叉发布

我试图保存一个模型，然后在成功保存后保存一些与初始模型相关的其他模型。这些都在标准输入字段中，我不知道如何绑定到ED，所以我只是使用标准的jQuery选择器来查找输入并保存模型。所有模型都在正确保存，但由于Array Methods must be provided an Array错误，Ember.RSVP.all正在调用REJECT。我不确定我应该在哪里提供数组。。。

一路上我检查了各种元素，var promises是一系列预期的承诺。我唯一能想到的是，传递到解析回调中的results值应该是一个数组吗？如果是这样的话，我不知道如何使它成为一个数组，而不是仅仅传递Ember.A()或[]

这是我的控制器中的相关代码。

submit: function () {
    var self = this;
    var division = this.get('model');
    var isNew = division.get('isNew');
    if(isNew) {
        division.setProperties({
            vendor: self.get('parentVendor'),
            vendorCategory: self.get('selectedCategory'),
            isActive: true,
            createdBy: 1,
            createdDate: moment().format()
        });
    } else {
        division.setProperties({
            vendorCategory: self.get('selectedCategory'),
            modifiedBy: 1,
            modifiedDate: moment().format()
        });
    }
    division.validate().then(function () {
        if (division.get('isValid')) {
            division.save().then(function(result) {
                /*
                    this bit of hackishness loops through each of the attribute input fields, creates a new DS.model for that attribute, 
                    saves the model, then returns the resulting promise to the promises array so they can be processed by RSVP.all to 
                    ensure that all the attributes save properly.
                 */
                // map the promises array
                var promises = $('input.attribute').map(function () {
                    var elem = $(this)[0];
                    var vendorTypeAttrId = $(elem).attr('data-attribute-id'),
                        attrValue = $(elem).val();
                    // create the model
                    var model = self.store.createRecord('vendor-division-attribute', {
                        division: result,
                        vendorTypeAttribute: self.get('categoryAttributes').findBy('id', vendorTypeAttrId),
                        value: attrValue,
                        createdBy: 1,
                        createdDate: moment().format()
                    });
                    // return the save promise
                    var p = model.save();
                    return p;
                });
                // Make sure all promises are resolved before continuing
                Ember.RSVP.all(promises).then(function (results) {
                    // it worked! keep calm and move along
                    self.send('closeModal');
                    var msg = isNew ? division.get('name') + ' Created!' : 'Changes saved!';
                    Bootstrap.NM.push(msg, 'success');
                }).catch(function(reason) {
                    // something went wrong - display the error
                    if (typeof reason.error !== 'undefined') {
                        // DSP error
                        if (Ember.keys(reason.error).length > 0) {
                            error = reason.error[0].message;
                        } else {
                            error = 'An error occured while saving your changes';
                        }
                    } else if (typeof reason.message !== 'undefined') {
                        error = reason.message;
                    } else {
                        error = reason;
                    }
                    console.log(error);
                    Bootstrap.NM.push('Error saving Vendor Division: ' + error, 'danger');
                });
            }, function(reason) {
                var error;
                if (typeof reason.error !== 'undefined') {
                    // DSP error
                    if (Ember.keys(reason.error).length > 0) {
                        error = reason.error[0].message;
                    } else {
                        error = 'An error occured while saving your changes';
                    }
                } else if (typeof reason.message !== 'undefined') {
                    error = reason.message;
                } else {
                    error = reason;
                }
                console.log(error);
                Bootstrap.NM.push('Error saving Vendor Division: ' + error, 'danger');
            });
        }
    });
}

Answer 1

您的promises数组实际上并不是一个数组。jQuery返回一个类似数组的对象，而不是一个真正的数组。尝试在控制台中运行此代码，您会看到：

var a = $('a').map(function() { return 1; });
console.log(Array.isArray(a));
console.log(a instanceof Array);

幸运的是，jQuery提供了一个很好的makeArray函数来解决这个问题。在声明promises之后，但在调用Ember.RSVP.all之前，插入以下行：

promises = $.makeArray(promises);