Question

我有一个用例，我想用虚拟定义一个架构，然后在多个地方使用该架构。为此，我在猫鼬文档中找到了.add属性，如here所示。

这不是我期望的行为，默认情况下，虚拟机不会填充。我查看了生成的特定架构，发现使用“ .add”创建它后，它不会保留原始架构的所有字段。特别是在“虚拟”对象中，“路径”属性变为空对象而不是字符串，而在“树”对象中，虚拟完全消失了。

我仔细检查了实际的依赖关系，发现这是“ .add”内部工作方式的结果，即它调用了一个名为“ merge”的函数，该函数将许多属性复制到新架构上。值得注意的是，合并功能对架构上的“树”对象不执行任何操作，对于虚拟机，它会复制名称/选项/获取器/设置程序，但对“路径”不执行任何操作。我手动将缺少的部分添加到了合并功能中，它解决了我的问题，但是我想知道我是不是使用不正确，还是这是猫鼬库中的错误，因为直接更新依赖项不是对我来说有效的解决方案。

这是我实例化架构的一个例子

const testBase= data.db.Schema({
    test: {type: String, required: true}
});
testBase.virtual('testVirtual')
.get(function () {
    return "test";
});
testBase.set('toObject', {virtuals: true});
testBase.set('toJSON', {virtuals: true});

const testParent = data.db.Schema();
testParent.add(testBase);
testParent.set('toObject', {virtuals: true});
testParent.set('toJSON', {virtuals: true});

在此示例中，如果我在模型中使用“ testBase”作为架构，则它将正确使用虚拟，而如果使用“ testParent”，则不会。当我期望它们的行为相同时。

获取两个模式的JSON可以在testBase上看到

{
"$id": 24,
"_indexes": [],
"_userProvidedOptions": {
    "toJSON": {
        "virtuals": true
    },
    "toObject": {
        "virtuals": true
    }
},
"aliases": {},
"callQueue": [],
"childSchemas": [],
"inherits": {},
"methodOptions": {},
"methods": {},
"nested": {},
"obj": {
    "test": {
        "required": true
    }
},
"options": {
    "_id": true,
    "autoIndex": null,
    "bufferCommands": true,
    "capped": false,
    "discriminatorKey": "__t",
    "id": true,
    "minimize": true,
    "noId": false,
    "noVirtualId": false,
    "read": null,
    "shardKey": null,
    "strict": true,
    "toJSON": {
        "virtuals": true
    },
    "toObject": {
        "virtuals": true
    },
    "typeKey": "type",
    "validateBeforeSave": true,
    "versionKey": "__v"
},
"paths": {
    "_id": {
        "$immutable": null,
        "_index": null,
        "getters": [],
        "instance": "ObjectID",
        "options": {
            "auto": true
        },
        "path": "_id",
        "setters": [
            null
        ],
        "validators": []
    },
    "test": {
        "$immutable": null,
        "_index": null,
        "enumValues": [],
        "getters": [],
        "instance": "String",
        "isRequired": true,
        "options": {
            "required": true
        },
        "originalRequiredValue": true,
        "path": "test",
        "regExp": null,
        "setters": [],
        "validators": [
            {
                "message": "Path `{PATH}` is required.",
                "type": "required"
            }
        ]
    }
},
"plugins": [],
"query": {},
"s": {
    "hooks": {
        "_posts": {},
        "_pres": {}
    }
},
"singleNestedPaths": {},
"statics": {},
"subpaths": {},
"tree": {
    "_id": {
        "auto": true
    },
    "test": {
        "required": true
    },
    "testVirtual": {
        "getters": [
            null
        ],
        "options": {},
        "path": "testVirtual",
        "setters": []
    }
},
"virtuals": {
    "testVirtual": {
        "getters": [
            null
        ],
        "options": {},
        "path": "testVirtual",
        "setters": []
    }
}

}

而这对于testParent

{
"$id": 25,
"_indexes": [],
"_userProvidedOptions": {
    "toJSON": {
        "virtuals": true
    },
    "toObject": {
        "virtuals": true
    }
},
"aliases": {},
"callQueue": [],
"childSchemas": [],
"inherits": {},
"methodOptions": {},
"methods": {},
"nested": {},
"options": {
    "_id": true,
    "autoIndex": null,
    "bufferCommands": true,
    "capped": false,
    "discriminatorKey": "__t",
    "id": true,
    "minimize": true,
    "noId": false,
    "noVirtualId": false,
    "read": null,
    "shardKey": null,
    "strict": true,
    "toJSON": {
        "virtuals": true
    },
    "toObject": {
        "virtuals": true
    },
    "typeKey": "type",
    "validateBeforeSave": true,
    "versionKey": "__v"
},
"paths": {
    "_id": {
        "$immutable": null,
        "_index": null,
        "getters": [],
        "instance": "ObjectID",
        "options": {
            "auto": true
        },
        "path": "_id",
        "setters": [
            null
        ],
        "validators": []
    },
    "test": {
        "$immutable": null,
        "_index": null,
        "enumValues": [],
        "getters": [],
        "instance": "String",
        "isRequired": true,
        "options": {
            "required": true
        },
        "originalRequiredValue": true,
        "path": "test",
        "regExp": null,
        "setters": [],
        "validators": [
            {
                "message": "Path `{PATH}` is required.",
                "type": "required"
            }
        ]
    }
},
"plugins": [],
"query": {},
"s": {
    "hooks": {
        "_posts": {},
        "_pres": {}
    }
},
"singleNestedPaths": {},
"statics": {},
"subpaths": {},
"tree": {
    "_id": {
        "auto": true
    },
    "test": {
        "required": true
    }
},
"virtuals": {
    "testVirtual": {
        "getters": [
            null
        ],
        "options": {},
        "path": {},
        "setters": []
    }
}

}

如果您比较缺少的架构，则可以看到哪些字段丢失。如果有人知道按照这些方式使用此功能或示例的正确方法，我将不胜感激。（我的测试是使用猫鼬5.7.8版完成的）

猫鼬如何使用.add与虚拟重用架构

0 个答案: