猫鼬/MongoDB。无法保存字符串数组

Question

更新：

终于找到了。下面的代码是完全有效的。只是在另一个模块中对 Layouts.blocks 进行了破坏性更新...

---

这里发生了一些非常奇怪的事情。

这是Layouts 架构的相关部分

blocks: [{
   full: {type: Boolean},
  fields: [{type: String}]
}]

和.pre保存另一个模型的中间件代码

Map.pre('save', function(next){
  var that = this;
  var Layouts = connection.model('layouts');
  var openFields = ['one', 'two'];
  Layouts.find({_company: that._company, object: that._id, default: true}, function(err, layouts){
    if (err) return next(err);
    var layout = layouts[0];

    console.log(layout.blocks);

    layout.blocks.set(0, {full: false, fields: openFields});
    layout.markModified('blocks');

    console.log(layout.blocks);

    layout.save(function(err){
      console.log('saved: ', err);
      next(err);
    });
  });
});

console.log 值是

[{ full: true, _id: 54147307f07097462fb93912, fields: [] }]
[{ full: false,
  _id: 54147307f07097462fb93918,
  fields: [ 'one', 'two' ] }]
saved:  null

然后我检查保存的布局并得到：

blocks: [ { full: false, _id: 54147307f07097462fb93918, fields: [] } ],

所以，_id 和 full 已保存，但 fields 未保存！

如果我直接更新会发生类似的事情

Layouts.update({_company: that._company, object: that._id, default: true},
    {$set: {'blocks.0.fields': openFields}},
    function(err){
      next(err);
  });

有什么建议吗？

Answer 1

我尝试实现您指定的相同架构，并尝试以三种不同的方式更新我的布局对象，所有这些都有效。这是我的实现和测试。从您提交的代码中看不到您的错误所在。

var mongoose = require('mongoose');                                              
mongoose.connect('mongodb://localhost/layout-test');                                    

var LayoutSchema = new mongoose.Schema({                                         
    blocks: [{                                                                   
        full: {type: Boolean},                                                   
        fields: [{                                                               
            type: String                                                         
        }],                                                                      
    }],                                                                          
});                                                                              
var Layout = mongoose.model('Layout', LayoutSchema);                             
var LAYOUT_DATA = {                                                                 
    blocks: [                                                                
        {full: true},                                                        
    ],                                                                       
};

// Updating the object, setting the first item of blocks
var test1 = function() {                                                        
    new Layout(LAYOUT_DATA).save(function(err, layout) {                                                             
        Layout.update({                                                          
            _id: layout._id                                                      
        }, {                                                                     
            $set: { 
                'blocks.0.full': false,                                                        
                'blocks.0.fields': ['one', 'two'],                               
            },                                                                   
        }, function(err, nbrOfUpdates) {                                                
            Layout.findById(layout._id, function(err, layout) {        
                if (layout.blocks[0].fields.length === 0) {
                    throw Error();
                }                                                                
            });                                                                  
        });                                                                      
    });                                                                          
};                                                                               

// Replacing the old blocks with a new array                                                                      
var test2 = function() {                                                       
    new Layout(LAYOUT_DATA).save(function(err, layout) {                                                 
        layout.blocks = [{                                                       
            full: false,                                                         
            fields: ['one', 'two'],                                              
        }];                                                              
        layout.save(function(err, layout) {  
            if (layout.blocks[0].fields.length === 0) {
                throw Error();
            }                                                                    
        });                                                                      
    });                                                                          
};         

// Pushing a new object to the blocks array and splicing away the old one
var test3 = function() {                                                      
    new Layout(layout).save(function(err, layout) {                                                 
        layout.blocks.push({                                                     
            full: false,                                                         
            fields: ['one', 'two'],                                              
        });                                                                      
        layout.blocks.splice(0, 1);                                              
        layout.save(function(err, layout) {           
            if (layout.blocks[0].fields.length === 0) {
                throw Error();
            }                                                 
        });                                                                      
    });                                                                          
};