json - 如何使用 JavaScript 在 ReThinkDB 中的 ReQL 中的数组上应用过滤器

Question

在下面的 JSON 中，我想选择销售额 > 12500 的记录。如何在 ReThinkDB 和 ReQL 中做到这一点？

JSON是：

{
 "address": {  
    "address_line1":  "Address Line 1" ,
    "address_line2":  "Address Line 2" ,
    "city":  "Kochin" ,
    "country":  "India" ,
    "state":  "Kerala"
  } ,
  "id":  "bbe6a9c4-ad9d-4a69-9743-d5aff115b280" ,
  "name":  "Dealer 1" ,
  "products": [
         {
           "product_name":  "Stabilizer" ,
           "sales": 12000
         } ,
         {
           "product_name":  "Induction Cooker" ,
           "sales": 14000
         }
    ]
   }, {
    "address": {
          "address_line1":  "Address Line 1" ,
          "address_line2":  "Address Line 2" ,
          "city":  "Kochin" ,
          "country":  "India" ,
          "state":  "Kerala"
     } ,
     "id":  "f033a4c2-959c-4e2f-a07d-d1a688100ed7" ,
     "name":  "Dealer 2" ,
     "products": [
           {
            "product_name":  "Stabilizer" ,
            "sales": 13000
           } ,
           {
            "product_name":  "Induction Cooker" ,
            "sales": 11000
           }
      ]

}

Answer 1

To get all documents that have at least one sales value over 12,500 for any product, you can use the following filter in ReQL:

r.table('t')
 .filter(r.row('products').contains(function(product) {
   return product('sales').gt(12500);
 }))

This makes use of the fact that you can pass a function into contains. array.contains(fun) returns true exactly if fun returns true for at least one of the elements in array. You can find more examples at http://rethinkdb.com/api/javascript/contains/