Backbone.js验证集合

Question

Backbone.js为模型提供验证。但是没有一种简单的方法来检查收集中的所有模型是否有效。否.isValid收藏属性。

我用这样一个黑客：

_.isEmpty(_.filter(myCollection.models, function(m) {return m.validationError;})) 

是否有“验证”收集更优化的方式？

Answer 1

如何使用some方法？

var hasErrors = _.some(myCollection.models, function(m) { 
    return m.validationError; 
}); 

Answer 2

lodash.js支持建设这样的（用“_.pluck”回调简写）：

_.some(myCollection.models, 'validationError'); 

Answer 3

我知道这是一个老问题，但请看看我决定这个问题。总之，它可以作为github回购backbone-collection-validation。现在，细节。为了验证收集这样

Collection = Backbone.Collection.extend({ 
    validate: function (collection) { 
    var nonExistIds = []; 
    _.forEach(collection, function (model) { 
     var friends = model.get('friends'); 
     if (friends && friends.length) { 
     for (var i = friends.length - 1; i >= 0; i--) { 
      if (!this.get(friends[i])) { 
      nonExistIds.push(friends[i]); 
      } 
     } 
     } 
    }, this); 
    if (nonExistIds.length) { 
     return 'Persons with id: ' + nonExistIds + ' don\'t exist in the collection.'; 
    } 
    } 
}) 

您需要与此

//This implementation is called simple because it 
// * allows to set invalid models into collection. Validation only will trigger 
// an event 'invalid' and nothing more. 
var parentSet = Backbone.Collection.prototype.set; 

Backbone.Collection.prototype.set = function (models, options) { 
    var parentResult = parentSet.apply(this, arguments); 
    if (options && options.validate) { 
    if (!_.isFunction(this.validate)) { 
     throw new Error('Cannot validate a collection without the `validate` method'); 
    } 
    var errors = this.validate(this.models); 
    if (errors) { 
     this.trigger('invalid', this, errors); 
    } 
    } 
    return parentResult; 
}; 

扩展您的骨干或与此

//This implementation is called advanced because it 
// * doesn't allow to set invalid models into collection. 

var parentSet = Backbone.Collection.prototype.set; 

Backbone.Collection.prototype.set = function (models, options) { 
    if (!options || !options.validate) { 
    return parentSet.apply(this, arguments); 
    } else { 
    if (!_.isFunction(this.validate)) { 
     throw new Error('Cannot validate a collection without the `validate` method'); 
    } 

    var clones = []; 
    _.forEach(this.models, function (model) { 
     clones.push(model.clone()); 
    }, this); 
    var exModels = this.models; 
    this.reset(clones); 
    var exSilent = options.silent; 
    options.silent = true; 
    parentSet.apply(this, arguments); 

    var errors = this.validate(this.models); 

    this.reset(exModels); 
    if (typeof exSilent === 'undefined') { 
     delete options.silent; 
    } else { 
     options.silent = exSilent; 
    } 
    if (errors) { 
     this.trigger('invalid', this, errors); 
     return this; 
    } else { 
     return parentSet.apply(this, arguments); 
    } 
    } 
}; 

Answer 4

的BackboneJS收藏delegates一些UnderscoreJS方法，如some。你可以这样使用它：

var hasErrors = myCollection.some(function(model) { 
    return model.validationError; 
});