数组中对象的 ArangoDB 聚合计数

Question

我正在尝试为图表中的以下文档生成构面（聚合计数）（基于集合而不是命名图表）：

{
  "relation": "decreases",
  "edge_type": "primary",
  "subject_lbl": "act(p(HGNC:AKT1), ma(DEFAULT:kin))",
  "object_lbl": "act(p(HGNC:CDKN1B), ma(DEFAULT:act))",
  "annotations": [
    {
      "type": "Disease",
      "label": "cancer",
      "id": "cancer"
    },
    {
      "type": "Anatomy",
      "label": "liver",
      "id": "liver"
    }
  ]
}

以下内容非常适合获取 edge_type 的构面（聚合计数）：

FOR doc in edges
COLLECT 
    edge_type = doc.edge_type WITH COUNT INTO edge_type_cnt
RETURN {edge_type, edge_type_cnt}

我尝试了以下方法来获取注释的计数[*]。键入值：

FOR doc in edges
COLLECT 
    edge_type = doc.edge_type WITH COUNT INTO edge_type_cnt,
    annotations = doc.annotations[*].type WITH COUNT INTO anno_cnt
RETURN {edge_type, edge_type_cnt, annotations, anno_cnt}

这会导致错误 - 知道我做错了什么吗？谢谢！

Answer 1

感谢这个帖子：https://groups.google.com/forum/#!topic/arangodb/vNFNVrYo9Yo linked to from this Question: 为我指明了正确的方向。

FOR doc in edges
    FOR anno in doc.annotations
    COLLECT anno_type = anno.type WITH COUNT INTO anno_cnt
RETURN {anno_type, anno_cnt}

结果：

Anatomy 4275
Cell  2183
CellLine  2093
CellStructure 2081
Disease 2126
Organism  2075
TextLocation  2121

遍历边缘然后注释数组是我遗漏的关键。

数组中对象的 ArangoDB 聚合计数

ArangoDB aggregation counts of objects in array

aggregation

arangodb