Question

我有RethinkDB的数据/表，请说“新闻”，其中包含大量数据行：

[
  {
    "author": "author1",
    "category_id": "business",
    "country": "id",
    "created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
    "description": "description",
    "id": "74c25662-7f94-47ef-8a7e-5091924819a9"
  },

  {
    "author": "author2",
    "category_id": "business",
    "country": "id",
    "created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
    "description": "description2",
    "id": "74c25662-7f94-47ef-8a7e-5091924819a9"
  },

  {
    "author": "author3",
    "category_id": "sport",
    "country": "id",
    "created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
    "description": "description3",
    "id": "74c25662-7f94-47ef-8a7e-5091924819a9"
  },

  {
    "author": "author3",
    "category_id": "business",
    "country": "id",
    "created_at": "Wed Aug 15 2018 09:26:52 GMT+07:00",
    "description": "description4",
    "id": "74c25662-7f94-47ef-8a7e-5091924819a9"
  }
  .....
]

我需要为category_id和created_at（timestamp）创建索引，并查询某些类别并仅按天（确定日期）进行过滤。我想优化并加快查询结果

我可以通过javascript category_id和business 15这样的过滤器在day中进行过滤：

r.table("news").filter({category_id: 'business'}).filter(
    r.row("created_at").day().eq(15)
)

但是我如何为category_id和created_at创建索引并在created_at的某一天进行查询。

r.table("news").indexCreate( ???

谢谢

Answer 1

应该是这样的：

r.table('news').indexCreate('businessAndDate', function (doc) {
  return doc('category_id').add(doc('created_at').day().coerceTo('string'));
});

然后您可以：

r.table('news').getAll('business15', {index: 'businessAndDate'})

您可能希望在数据之间插入分隔符（例如'business-15'），并且不仅仅使用一天（否则，为什么要花整整的时间戳记？），这取决于您以及有多少{{ 1}}您愿意写。 ;）根据{{3}}，这称为任意索引。

RethinkDB随时间为两个字段建立索引

1 个答案: