[譯]JSON數據范式化（normalizr）
開發復雜的應用時，不可避免會有一些數據相互引用。建議你盡可能地把 state 范式化，不存在嵌套。把所有數據放到一個對象里，每個數據以 ID 為主鍵，不同數據相互引用時通過 ID 來查找。把 應用的 state 想像成數據庫 。這種方法在 normalizr 文檔里有詳細闡述。
normalizr ：將嵌套的JSON格式扁平化，方便被Redux利用；
目標
我們的目標是將：
[{
id: 1,
title: 'Some Article',
author: {
id: 1,
name: 'Dan'
}
}, {
id: 2,
title: 'Other Article',
author: {
id: 1,
name: 'Dan'
}
}]- 數組的每個對象都糅合了三個維度 文章 、 作者
- 按照數據范式，應當將這兩個維度拆分出來，兩者的聯系通過id關聯起來即可
我們描述上述的結構： - 返回的是一個數組（array） - 數組的對象中包含另外一個schema —— user
應該比較合理的，應該是轉換成：
{
result: [1, 2],
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
author: 1
},
2: {
id: 2,
title: 'Other Article',
author: 1
}
},
users: {
1: {
id: 1,
name: 'Dan'
}
}
}
}如何使用
觀看示例最好的，就是官方的測試文件： https://github.com/gaearon/normalizr/blob/master/test/index.js
先引入 normalizr ：
import { normalize, Schema, arrayOf } from 'normalizr'; 定義 schema ：
var article = new Schema('articles'),
user = new Schema('users'),
collection = new Schema('collections'),
feedSchema,
input;定義規則：
article.define({
author: user,
collections: arrayOf(collection)
});
collection.define({
curator: user
});
feedSchema = {
feed: arrayOf(article)
};測試：
input = {
feed: [{
id: 1,
title: 'Some Article',
author: {
id: 3,
name: 'Mike Persson'
},
collections: [{
id: 1,
title: 'Awesome Writing',
curator: {
id: 4,
name: 'Andy Warhol'
}
}, {
id: 7,
title: 'Even Awesomer',
curator: {
id: 100,
name: 'T.S. Eliot'
}
}]
}, {
id: 2,
title: 'Other Article',
collections: [{
id: 2,
title: 'Neverhood',
curator: {
id: 120,
name: 'Ada Lovelace'
}
}],
author: {
id: 2,
name: 'Pete Hunt'
}
}]
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [1, 2]
},
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
author: 3,
collections: [1, 7]
},
2: {
id: 2,
title: 'Other Article',
author: 2,
collections: [2]
}
},
collections: {
1: {
id: 1,
title: 'Awesome Writing',
curator: 4
},
2: {
id: 2,
title: 'Neverhood',
curator: 120
},
7: {
id: 7,
title: 'Even Awesomer',
curator: 100
}
},
users: {
2: {
id: 2,
name: 'Pete Hunt'
},
3: {
id: 3,
name: 'Mike Persson'
},
4: {
id: 4,
name: 'Andy Warhol'
},
100: {
id: 100,
name: 'T.S. Eliot'
},
120: {
id: 120,
name: 'Ada Lovelace'
}
}
}
});優勢
假定請求 /articles 返回的數據的schema如下：
articles: article*
article: {
author: user,
likers: user*
primary_collection: collection?
collections: collection*
}
collection: {
curator: user
} 如果不做范式化，store需要事先知道API的各種結構，比如 UserStore 會包含很多樣板代碼來獲取新用戶，諸如下面那樣：
switch (action.type) {
case ActionTypes.RECEIVE_USERS:
mergeUsers(action.rawUsers);
break;
case ActionTypes.RECEIVE_ARTICLES:
action.rawArticles.forEach(rawArticle => {
mergeUsers([rawArticle.user]);
mergeUsers(rawArticle.likers);
mergeUsers([rawArticle.primaryCollection.curator]);
rawArticle.collections.forEach(rawCollection => {
mergeUsers(rawCollection.curator);
});
});
UserStore.emitChange();
break;
}store表示累覺不愛啊！！ 每個store都要對返回的 進行各種foreach 才能獲取想要的數據。
來一個范式吧：
const article = new Schema('articles');
const user = new Schema('users');
article.define({
author: user,
contributors: arrayOf(user),
meta: {
likes: arrayOf({
user: user
})
}
});
// ...
const json = getArticleArray();
const normalized = normalize(json, arrayOf(article)); 經過范式整頓之后，你愛理或者不愛理，users對象總是在 action.entities.users 中：
const { action } = payload;
if (action.response && action.response.entities && action.response.entities.users) {
mergeUsers(action.response.entities.users);
UserStore.emitChange();
break;
}更多示例（來自測試文件）
規范化單個文件
var article = new Schema('articles'),
input;
input = {
id: 1,
title: 'Some Article',
isFavorite: false
};
Object.freeze(input);
normalize(input, article).should.eql({
result: 1,
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
isFavorite: false
}
}
}
});規范化內嵌對象，并刪除額外key
有時候后端接口會返回很多額外的字段，甚至會有重復的字段；比如下方示例中 typeId 和 type.id 是重復的；注意方法中 形參 key 是經過 artcle.define 定義過的。
var article = new Schema('articles'),
type = new Schema('types'),
input;
// 定義內嵌規則
article.define({
type: type
});
input = {
id: 1,
title: 'Some Article',
isFavorite: false,
typeId: 1,
type: {
id: 1,
}
};
Object.freeze(input);
// assignEntity刪除后端返回額外數據的
var options = {
assignEntity: function(obj, key, val) {
obj[key] = val;
delete obj[key + 'Id'];
}
};
normalize(input, article, options).should.eql({
result: 1,
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
isFavorite: false,
type: 1
}
},
types: {
1: {
id: 1
}
}
}
});添加額外數據
和上個示例相反的是， mergeIntoEntity 用于將多份同質數據不同信息融合到一起，用于解決沖突。
下方示例中， author 和 reviewer 是同一個人，只是前者留下的聯系方式是手機，后者留下的聯系方式是郵箱，但無論如何都是同一個人；
此時就可以使用 mergeIntoEntity 將兩份數據融合到一起；（注意這里是用 valueOf 規則 ）
var author = new Schema('authors'),
input;
input = {
author: {
id: 1,
name: 'Ada Lovelace',
contact: {
phone: '555-0100'
}
},
reviewer: {
id: 1,
name: 'Ada Lovelace',
contact: {
email: 'ada@lovelace.com'
}
}
}
Object.freeze(input);
var options = {
mergeIntoEntity: function(entityA, entityB, entityKey) {
var key;
for (key in entityB) {
if (!entityB.hasOwnProperty(key)) {
continue;
}
if (!entityA.hasOwnProperty(key) || isEqual(entityA[key], entityB[key])) {
entityA[key] = entityB[key];
continue;
}
if (isObject(entityA[key]) && isObject(entityB[key])) {
merge(entityA[key], entityB[key])
continue;
}
console.warn('Unequal data!');
}
}
};
normalize(input, valuesOf(author), options).should.eql({
result: {
author: 1,
reviewer: 1
},
entities: {
authors: {
1: {
id: 1,
name: 'Ada Lovelace',
contact: {
phone: '555-0100',
email: 'ada@lovelace.com'
}
}
}
}
});按指定的屬性規范化
有時候對象沒有 id 屬性，或者我們并不想按 id 屬性規范化，可以使用 idAttribute 指定；
下面的例子，就是使用 slug 作為規范化的key：
var article = new Schema('articles', { idAttribute: 'slug' }),
input;
input = {
id: 1,
slug: 'some-article',
title: 'Some Article',
isFavorite: false
};
Object.freeze(input);
normalize(input, article).should.eql({
result: 'some-article',
entities: {
articles: {
'some-article': {
id: 1,
slug: 'some-article',
title: 'Some Article',
isFavorite: false
}
}
}
});創建自定義的屬性
有時候想自己創建一個key，雖然今天和去年創建的文章名稱都是 Happy ，但明顯是不一樣的，為了按時間區分出來，可以 使用自定義函數生成想要的key 。
function makeSlug(article) {
var posted = article.posted,
title = article.title.toLowerCase().replace(' ', '-');
return [title, posted.year, posted.month, posted.day].join('-');
}
var article = new Schema('articles', { idAttribute: makeSlug }),
input;
input = {
id: 1,
title: 'Some Article',
isFavorite: false,
posted: {
day: 12,
month: 3,
year: 1983
}
};
Object.freeze(input);
normalize(input, article).should.eql({
result: 'some-article-1983-3-12',
entities: {
articles: {
'some-article-1983-3-12': {
id: 1,
title: 'Some Article',
isFavorite: false,
posted: {
day: 12,
month: 3,
year: 1983
}
}
}
}
});規范化數組
后端返回的數據往往是一串數組居多，此時規范化起到很大的作用，規范化的同時將數據壓縮了一遍；
var article = new Schema('articles'),
input;
input = [{
id: 1,
title: 'Some Article'
}, {
id: 2,
title: 'Other Article'
}];
Object.freeze(input);
normalize(input, arrayOf(article)).should.eql({
result: [1, 2],
entities: {
articles: {
1: {
id: 1,
title: 'Some Article'
},
2: {
id: 2,
title: 'Other Article'
}
}
}
});抽取多個schema
上面講的情形比較簡單，只涉及抽出結果是單個schema的情形；現實中，你往往想抽象出多個schema，比如下方，我想抽離出 tutorials （教程） 和 articles （文章）兩個 schema，此時需要 通過 schemaAttribute 選項指定區分這兩個 schema 的字段 ：
var article = new Schema('articles'),
tutorial = new Schema('tutorials'),
articleOrTutorial = { articles: article, tutorials: tutorial },
input;
input = [{
id: 1,
type: 'articles',
title: 'Some Article'
}, {
id: 1,
type: 'tutorials',
title: 'Some Tutorial'
}];
Object.freeze(input);
normalize(input, arrayOf(articleOrTutorial, { schemaAttribute: 'type' })).should.eql({
result: [
{id: 1, schema: 'articles'},
{id: 1, schema: 'tutorials'}
],
entities: {
articles: {
1: {
id: 1,
type: 'articles',
title: 'Some Article'
}
},
tutorials: {
1: {
id: 1,
type: 'tutorials',
title: 'Some Tutorial'
}
}
}
});這個示例中，雖然文章的id都是1，但很明顯它們是不同的文章，因為一篇是普通文章，一篇是教程文章；因此要按schema維度抽離數據；
這里的 arrayOf(articleOrTutorial) 中的 articleOrTutorial 是包含多個屬性的對象，這表示 input 應該是 articleOrTutorial 中的一種情況；
有時候原始數據屬性 和 我們定義的有些差別，此時可以將 schemaAttribute 的值設成函數，將原始屬性經過適當加工；比如原始屬性是 tutorial , 而抽離出的 schema 名字為 tutorials ，相差一個 s ：
function guessSchema(item) {
return item.type + 's';
}
var article = new Schema('articles'),
tutorial = new Schema('tutorials'),
articleOrTutorial = { articles: article, tutorials: tutorial },
input;
input = [{
id: 1,
type: 'article',
title: 'Some Article'
}, {
id: 1,
type: 'tutorial',
title: 'Some Tutorial'
}];
Object.freeze(input);
normalize(input, arrayOf(articleOrTutorial, { schemaAttribute: guessSchema })).should.eql({
result: [
{ id: 1, schema: 'articles' },
{ id: 1, schema: 'tutorials' }
],
entities: {
articles: {
1: {
id: 1,
type: 'article',
title: 'Some Article'
}
},
tutorials: {
1: {
id: 1,
type: 'tutorial',
title: 'Some Tutorial'
}
}
}
});上述是數組情況，針對普通的對象也是可以的，將規則 改成 valueOf 即可：
var article = new Schema('articles'),
tutorial = new Schema('tutorials'),
articleOrTutorial = { articles: article, tutorials: tutorial },
input;
input = {
one: {
id: 1,
type: 'articles',
title: 'Some Article'
},
two: {
id: 2,
type: 'articles',
title: 'Another Article'
},
three: {
id: 1,
type: 'tutorials',
title: 'Some Tutorial'
}
};
Object.freeze(input);
normalize(input, valuesOf(articleOrTutorial, { schemaAttribute: 'type' })).should.eql({
result: {
one: {id: 1, schema: 'articles'},
two: {id: 2, schema: 'articles'},
three: {id: 1, schema: 'tutorials'}
},
entities: {
articles: {
1: {
id: 1,
type: 'articles',
title: 'Some Article'
},
2: {
id: 2,
type: 'articles',
title: 'Another Article'
}
},
tutorials: {
1: {
id: 1,
type: 'tutorials',
title: 'Some Tutorial'
}
}
}
});schemaAttribute 是函數的情況就不列舉了，和上述一致；
規范化內嵌情形
上面的對象比較簡單，原本就是扁平化的；如果對象格式稍微復雜一些，比如每篇文章有多個作者的情形。此時需要使用 define 事先聲明 schema 之間的層級關系：
var article = new Schema('articles'),
user = new Schema('users'),
input;
article.define({
author: user
});
input = {
id: 1,
title: 'Some Article',
author: {
id: 3,
name: 'Mike Persson'
}
};
Object.freeze(input);
normalize(input, article).should.eql({
result: 1,
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
author: 3
}
},
users: {
3: {
id: 3,
name: 'Mike Persson'
}
}
}
});</code></pre>
上面是不是覺得簡單了？那么給你一個比較復雜的情形，萬變不離其宗。我們最終想抽離出 articles 、 users 以及 collections 這三個 schema，所以只要定義這三個schema就行了，
然后使用 define 方法聲明這三個schema之間千絲萬縷的關系；
最外層的feed只是屬性，并不需要定義；
var article = new Schema('articles'),
user = new Schema('users'),
collection = new Schema('collections'),
feedSchema,
input;
article.define({
author: user,
collections: arrayOf(collection)
});
collection.define({
curator: user
});
feedSchema = {
feed: arrayOf(article)
};
input = {
feed: [{
id: 1,
title: 'Some Article',
author: {
id: 3,
name: 'Mike Persson'
},
collections: [{
id: 1,
title: 'Awesome Writing',
curator: {
id: 4,
name: 'Andy Warhol'
}
}, {
id: 7,
title: 'Even Awesomer',
curator: {
id: 100,
name: 'T.S. Eliot'
}
}]
}, {
id: 2,
title: 'Other Article',
collections: [{
id: 2,
title: 'Neverhood',
curator: {
id: 120,
name: 'Ada Lovelace'
}
}],
author: {
id: 2,
name: 'Pete Hunt'
}
}]
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [1, 2]
},
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
author: 3,
collections: [1, 7]
},
2: {
id: 2,
title: 'Other Article',
author: 2,
collections: [2]
}
},
collections: {
1: {
id: 1,
title: 'Awesome Writing',
curator: 4
},
2: {
id: 2,
title: 'Neverhood',
curator: 120
},
7: {
id: 7,
title: 'Even Awesomer',
curator: 100
}
},
users: {
2: {
id: 2,
name: 'Pete Hunt'
},
3: {
id: 3,
name: 'Mike Persson'
},
4: {
id: 4,
name: 'Andy Warhol'
},
100: {
id: 100,
name: 'T.S. Eliot'
},
120: {
id: 120,
name: 'Ada Lovelace'
}
}
}
});</code></pre>
內嵌+數組傾斜
var article = new Schema('articles'),
tutorial = new Schema('tutorials'),
articleOrTutorial = { articles: article, tutorials: tutorial },
user = new Schema('users'),
collection = new Schema('collections'),
feedSchema,
input;
article.define({
author: user,
collections: arrayOf(collection)
});
tutorial.define({
author: user,
collections: arrayOf(collection)
});
collection.define({
curator: user
});
feedSchema = {
feed: arrayOf(articleOrTutorial, { schemaAttribute: 'type' })
};
input = {
feed: [{
id: 1,
type: 'articles',
title: 'Some Article',
author: {
id: 3,
name: 'Mike Persson'
},
collections: [{
id: 1,
title: 'Awesome Writing',
curator: {
id: 4,
name: 'Andy Warhol'
}
}, {
id: 7,
title: 'Even Awesomer',
curator: {
id: 100,
name: 'T.S. Eliot'
}
}]
}, {
id: 1,
type: 'tutorials',
title: 'Some Tutorial',
collections: [{
id: 2,
title: 'Neverhood',
curator: {
id: 120,
name: 'Ada Lovelace'
}
}],
author: {
id: 2,
name: 'Pete Hunt'
}
}]
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [
{ id: 1, schema: 'articles' },
{ id: 1, schema: 'tutorials' }
]
},
entities: {
articles: {
1: {
id: 1,
type: 'articles',
title: 'Some Article',
author: 3,
collections: [1, 7]
}
},
tutorials: {
1: {
id: 1,
type: 'tutorials',
title: 'Some Tutorial',
author: 2,
collections: [2]
}
},
collections: {
1: {
id: 1,
title: 'Awesome Writing',
curator: 4
},
2: {
id: 2,
title: 'Neverhood',
curator: 120
},
7: {
id: 7,
title: 'Even Awesomer',
curator: 100
}
},
users: {
2: {
id: 2,
name: 'Pete Hunt'
},
3: {
id: 3,
name: 'Mike Persson'
},
4: {
id: 4,
name: 'Andy Warhol'
},
100: {
id: 100,
name: 'T.S. Eliot'
},
120: {
id: 120,
name: 'Ada Lovelace'
}
}
}
});</code></pre>
內嵌 + 對象（再內嵌）
看到下面的 valuesOf(arrayOf(user)) 了沒有，它表示該屬性是一個對象，對象里面各個數組值是 User對象數組；
var article = new Schema('articles'),
user = new Schema('users'),
feedSchema,
input;
article.define({
collaborators: valuesOf(arrayOf(user))
});
feedSchema = {
feed: arrayOf(article),
suggestions: valuesOf(arrayOf(article))
};
input = {
feed: [{
id: 1,
title: 'Some Article',
collaborators: {
authors: [{
id: 3,
name: 'Mike Persson'
}],
reviewers: [{
id: 2,
name: 'Pete Hunt'
}]
}
}, {
id: 2,
title: 'Other Article',
collaborators: {
authors: [{
id: 2,
name: 'Pete Hunt'
}]
}
}, {
id: 3,
title: 'Last Article'
}],
suggestions: {
1: [{
id: 2,
title: 'Other Article',
collaborators: {
authors: [{
id: 2,
name: 'Pete Hunt'
}]
}
}, {
id: 3,
title: 'Last Article'
}]
}
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [1, 2, 3],
suggestions: {
1: [2, 3]
}
},
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
collaborators: {
authors: [3],
reviewers: [2]
}
},
2: {
id: 2,
title: 'Other Article',
collaborators: {
authors: [2]
}
},
3: {
id: 3,
title: 'Last Article'
}
},
users: {
2: {
id: 2,
name: 'Pete Hunt'
},
3: {
id: 3,
name: 'Mike Persson'
}
}
}
});</code></pre>
還有更加復雜的，這次用上 valuesOf(userOrGroup, { schemaAttribute: 'type' }) 了：
var article = new Schema('articles'),
user = new Schema('users'),
group = new Schema('groups'),
userOrGroup = { users: user, groups: group },
feedSchema,
input;
article.define({
collaborators: valuesOf(userOrGroup, { schemaAttribute: 'type' })
});
feedSchema = {
feed: arrayOf(article),
suggestions: valuesOf(arrayOf(article))
};
input = {
feed: [{
id: 1,
title: 'Some Article',
collaborators: {
author: {
id: 3,
type: 'users',
name: 'Mike Persson'
},
reviewer: {
id: 2,
type: 'groups',
name: 'Reviewer Group'
}
}
}, {
id: 2,
title: 'Other Article',
collaborators: {
author: {
id: 2,
type: 'users',
name: 'Pete Hunt'
}
}
}, {
id: 3,
title: 'Last Article'
}],
suggestions: {
1: [{
id: 2,
title: 'Other Article'
}, {
id: 3,
title: 'Last Article'
}]
}
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [1, 2, 3],
suggestions: {
1: [2, 3]
}
},
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
collaborators: {
author: { id: 3, schema: 'users' },
reviewer: { id: 2, schema: 'groups' }
}
},
2: {
id: 2,
title: 'Other Article',
collaborators: {
author: { id: 2, schema: 'users' }
}
},
3: {
id: 3,
title: 'Last Article'
}
},
users: {
2: {
id: 2,
type: 'users',
name: 'Pete Hunt'
},
3: {
id: 3,
type: 'users',
name: 'Mike Persson'
}
},
groups: {
2: {
id: 2,
type: 'groups',
name: 'Reviewer Group'
}
}
}
});</code></pre>
遞歸調用
比如某某人關注了另外的人， 用戶 寫了一系列文章，該文章 被其他用戶 訂閱就是這種情況：
var article = new Schema('articles'),
user = new Schema('users'),
collection = new Schema('collections'),
feedSchema,
input;
user.define({
articles: arrayOf(article)
});
article.define({
collections: arrayOf(collection)
});
collection.define({
subscribers: arrayOf(user)
});
feedSchema = {
feed: arrayOf(article)
};
input = {
feed: [{
id: 1,
title: 'Some Article',
collections: [{
id: 1,
title: 'Awesome Writing',
subscribers: [{
id: 4,
name: 'Andy Warhol',
articles: [{
id: 1,
title: 'Some Article'
}]
}, {
id: 100,
name: 'T.S. Eliot',
articles: [{
id: 1,
title: 'Some Article'
}]
}]
}, {
id: 7,
title: 'Even Awesomer',
subscribers: [{
id: 100,
name: 'T.S. Eliot',
articles: [{
id: 1,
title: 'Some Article'
}]
}]
}]
}]
};
Object.freeze(input);
normalize(input, feedSchema).should.eql({
result: {
feed: [1]
},
entities: {
articles: {
1: {
id: 1,
title: 'Some Article',
collections: [1, 7]
}
},
collections: {
1: {
id: 1,
title: 'Awesome Writing',
subscribers: [4, 100]
},
7: {
id: 7,
title: 'Even Awesomer',
subscribers: [100]
}
},
users: {
4: {
id: 4,
name: 'Andy Warhol',
articles: [1]
},
100: {
id: 100,
name: 'T.S. Eliot',
articles: [1]
}
}
}
});</code></pre>
上面還算好的，有些schema直接就遞歸聲明了，比如 兒女和父母 的關系：
var user = new Schema('users'),
input;
user.define({
parent: user
});
input = {
id: 1,
name: 'Andy Warhol',
parent: {
id: 7,
name: 'Tom Dale',
parent: {
id: 4,
name: 'Pete Hunt'
}
}
};
Object.freeze(input);
normalize(input, user).should.eql({
result: 1,
entities: {
users: {
1: {
id: 1,
name: 'Andy Warhol',
parent: 7
},
7: {
id: 7,
name: 'Tom Dale',
parent: 4
},
4: {
id: 4,
name: 'Pete Hunt'
}
}
}
});</code></pre>
自動merge屬性
在一個數組里面，如果id屬性一致，會自動抽取并合屬性成一個：
var writer = new Schema('writers'),
book = new Schema('books'),
schema = arrayOf(writer),
input;
writer.define({
books: arrayOf(book)
});
input = [{
id: 3,
name: 'Jo Rowling',
isBritish: true,
location: {
x: 100,
y: 200,
nested: ['hello', {
world: true
}]
},
books: [{
id: 1,
soldWell: true,
name: 'Harry Potter'
}]
}, {
id: 3,
name: 'Jo Rowling',
bio: 'writer',
location: {
x: 100,
y: 200,
nested: ['hello', {
world: true
}]
},
books: [{
id: 1,
isAwesome: true,
name: 'Harry Potter'
}]
}];
normalize(input, schema).should.eql({
result: [3, 3],
entities: {
writers: {
3: {
id: 3,
isBritish: true,
name: 'Jo Rowling',
bio: 'writer',
books: [1],
location: {
x: 100,
y: 200,
nested: ['hello', {
world: true
}]
}
}
},
books: {
1: {
id: 1,
isAwesome: true,
soldWell: true,
name: 'Harry Potter'
}
}
}
});</code></pre>
如果合并過程中有沖突會有提示，并自動剔除沖突的屬性；比如下方同一個作者寫的書，一個對象里描述“賣得好”，而在另外一個對象里卻描述“賣得差”，明顯是有問題的：
var writer = new Schema('writers'),
book = new Schema('books'),
schema = arrayOf(writer),
input;
writer.define({
books: arrayOf(book)
});
input = [{
id: 3,
name: 'Jo Rowling',
books: [{
id: 1,
soldWell: true,
name: 'Harry Potter'
}]
}, {
id: 3,
name: 'Jo Rowling',
books: [{
id: 1,
soldWell: false,
name: 'Harry Potter'
}]
}];
var warnCalled = false,
realConsoleWarn;
function mockWarn() {
warnCalled = true;
}
realConsoleWarn = console.warn;
console.warn = mockWarn;
normalize(input, schema).should.eql({
result: [3, 3],
entities: {
writers: {
3: {
id: 3,
name: 'Jo Rowling',
books: [1]
}
},
books: {
1: {
id: 1,
soldWell: true,
name: 'Harry Potter'
}
}
}
});
warnCalled.should.eq(true);
console.warn = realConsoleWarn;</code></pre>
傳入不存在的schema規范
如果應用的schma規范不存在，你還傳入，就會創建一個新的父屬性：
var writer = new Schema('writers'),
schema = writer,
input;
input = {
id: 'constructor',
name: 'Constructor',
isAwesome: true
};
normalize(input, schema).should.eql({
result: 'constructor',
entities: {
writers: {
constructor: {
id: 'constructor',
name: 'Constructor',
isAwesome: true
}
}
}</code></pre> </div>
來自： https://yq.aliyun.com/articles/3168
本文由用戶 jopen 自行上傳分享，僅供網友學習交流。所有權歸原作者，若您的權利被侵害，請聯系管理員。
轉載本站原創文章，請注明出處，并保留原始鏈接、圖片水印。
本站是一個以用戶分享為主的開源技術平臺，歡迎各類分享！