使用 Breeze 元数据助手如何在客户端手动构造继承

Question

使用 mongoose 和 Node.js 我制作了一个 Base 实体子分类为 User 实体和 Person 实体，并且都引用了 Family 实体，我的问题是使用 breeze-MetadataHelper 我如何定义一个家庭可以拥有 navigationProperties 数组，该数组采用 Person 或 User 实体。简而言之，我正在失去 OOP，所以有没有一种方法可以在客户端上使用 Breeze 构建具有多态支持的继承，这就是我想出的方法。

   var addFamilyItemType = (): any => {
            var entityType = {
                name: this.entityNames.Family,
                dataProperties: {
                    id: {type: DT.MongoObjectId},
                    name: {type: DT.String, required: true, max: 50}
                },

                navigationProperties: {
                //this is where i want one navigation since they are a subclass
                // members: {type: [], hasMany: true}
                    users: {type: [this.entityNames.User], hasMany: true},
                    people: {type: [this.entityNames.Person], hasMany: true}
                }
            };

            helper.addTypeToStore(store, entityType);
            return entityType;
        };

  var addUserItemType = (): any => {
            var entityType = {
                name: this.entityNames.User,
                dataProperties: {
                    id: {type: DT.MongoObjectId},
                    email: {type: DT.String, required: true, max: 50},
                    username: {type: DT.String, required: true, max: 20},
                    password: {type: DT.String, 'default': ''}
                },
                navigationProperties: {
                    family: {
                        entityTypeName: this.entityNames.Family,
                        associationName: 'User_Family',
                        foreignKeyNames: ['familyId']
                    }
                }
            };

            helper.addTypeToStore(store, entityType);
            return entityType;
        };

 var addPersonItemType = (): any => {
            var entityType = {
                name: this.entityNames.Person,
                dataProperties: {
                    id: {type: DT.MongoObjectId},
                    email: {type: DT.String, max: 50},
                    profileImageURL: {type: DT.String,'default':''}                       
                },
                navigationProperties: {
                    family: {
                        entityTypeName: this.entityNames.Family,
                        associationName: 'Person_Family',
                        foreignKeyNames: ['familyId']
                    }
                }
            };

            helper.addTypeToStore(store, entityType);
            return entityType;
        };

Answer 1

我找到的解决方案是向 FamilyModel 对象添加一个 getter 属性调用的成员，这将 return 在调用 registerEntityTypeCtor 时合并数组 User 和 Person，我想breeze 开箱即用地支持继承。

var metadataStore = this.metadata.createMetadataStore();
var registerType = metadataStore.registerEntityTypeCtor.bind(metadataStore);

registerType(this.metadata.entityNames.Family, FamilyModel);

使用 Breeze 元数据助手如何在客户端手动构造继承

Using Breeze metadata helper how to construct inheritance on client side by hand

javascript

inheritance

mongoose

node.js

breeze