使用lodash groupBy函數對數組中的對象進行分類

Question

我有一系列產品，每個產品都有一個類別對象。 我需要按類別組織並包括類別對象。 GroupBy函數僅包含一個參數。

產品系列

const data = [   
  {id: 1, 'name': 'produto1', category: {id: 1, name: 'shirts', description: 'super roupa'}},
  {id: 2, 'name': 'produto2', category: {id: 1, name: 'shirts', description: 'super roupa'}},
  {id: 3, 'name': 'produto3', category: {id: 2, name: 'jackets', description: 'super jackets'}},
  {id: 4, 'name': 'produto4', category: {id: 2, name: 'jackets', description: 'super jackets'}},    
]

預期結果：

[
  {
    category: {id: 1, name: 'clothes', description: 'super roupa'}, 
    products:[{id:1, name: 'produt1'}, {id: 2, name: 'produto1'} ]
  },
  {
    category: {id: 2, name: 'jackets', description: 'super jackets'}, 
    products:[{id:3, name: 'produt3'}, {id: 4, name: 'produto4'} ]
  },
]

Answer 1

由組category.id ，然后通過取映射每個組到對象category從第一項目組中的，並省略category從所有產品：

 const data = [{"id":1,"name":"produto1","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":2,"name":"produto2","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":3,"name":"produto3","category":{"id":2,"name":"jackets","description":"super jackets"}},{"id":4,"name":"produto4","category":{"id":2,"name":"jackets","description":"super jackets"}}] const result = _(data) .groupBy('category.id') .map(group => ({ category: _.head(group).category, products: _.map(group, o => _.omit(o, 'category')) })) .value() console.log(result) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js"></script> 

或與lodash / fp等效的_.flow()函數：

 const { flow, groupBy, map, head, omit } = _ const fn = flow( groupBy('category.id'), map(group => ({ category: head(group).category, products: map(omit('category'), group) })) ) const data = [{"id":1,"name":"produto1","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":2,"name":"produto2","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":3,"name":"produto3","category":{"id":2,"name":"jackets","description":"super jackets"}},{"id":4,"name":"produto4","category":{"id":2,"name":"jackets","description":"super jackets"}}] const result = fn(data) console.log(result) 

 <script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script> 

Answer 2

這是一個沒有lodash的解決方案：

您可以reduce數據數組。 解構的參數來獲取category和rest分開的屬性。 rest將具有id和name屬性。 然后使用每個唯一類別的id作為鍵創建一個累加器對象。 將值設置為輸出中所需的最終對象。 如果密鑰已經存在，請更新它的products數組。 否則，向累加器添加一個新密鑰。 然后，最后使用Object.values()將該累加器對象轉換為所需值的數組

 const data = [{"id":1,"name":"produto1","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":2,"name":"produto2","category":{"id":1,"name":"shirts","description":"super roupa"}},{"id":3,"name":"produto3","category":{"id":2,"name":"jackets","description":"super jackets"}},{"id":4,"name":"produto4","category":{"id":2,"name":"jackets","description":"super jackets"}}] const merged = data.reduce((acc, { category, ...rest }) => { acc[category.id] = acc[category.id] || { category, products: [] }; acc[category.id].products.push(rest); return acc; }, {}) console.log(Object.values(merged))