AQL 嵌套数组值

Question

我对 ArangoDB 和 AQL 还很陌生，我的问题与嵌套数组值有关。我不知道是否有办法做到这一点（或者即使我的查询被有效地编写）

为了简短起见，我有 2 个合集。一份用于 "Physicians"，一份用于 "Indications"。每次我的病人去看医生咨询时，his/her 症状列表都会记录在适应症集合中。但是，之前的诊断可能是由另一位医生做出的。在这种情况下，我的 AQL 语法如下所示：

FOR p in Patients
FILTER p._key=="cad010117"
RETURN {
   "name" : CONCAT(p.pfname, " ", p.plastname),
   "consultations" : (
       FOR i in Indications
       FILTER i.pat_id == p._key
          FOR d in Physicians
          FILTER i.ind_consul_doc == d._key

          RETURN {
              "Doctor" : CONCAT(d.dtitle, " ", d.dfirstname, " ", d.dlastname),
              "Consult Date" : i.ind_consul_dt,
              "Symptoms" : i.symptoms[*],
              "Past Diagnoses" : i.diagnosis[* RETURN {
                      "Condition" : CURRENT.diag, 
                      "Diagnosed on" : CURRENT.diag_dt, 
                      "Diagnosed by" : CURRENT.diag_doc
                  }
              ]
          }
   )

我对应的结果：

[
  {
    "name": "Alfred Jeffries",
    "consultations": [
      {
        "Doctor": "Dr Anthony Garcia",
        "Consult Date": "22nd Jun 2016",
        "Symptoms": [
          {
            "type": "hyperpyrexia",
            "details": "Temperature: 101",
            "duration": "3d"
          },
          {
            "type": "anxiety",
            "details": "Severe",
            "duration": "1w"
          },
          {
            "type": "mania",
            "details": "Moderate",
            "duration": "1w"
          },
          {
            "type": "diaphoresis",
            "details": "Increased sweating during the day only",
            "duration": "3d"
          }
        ],
        "Past Diagnoses": [
          {
            "Condition": "Bipolar Disorder",
            "Diagnosed on": "6th Jul 2016",
            "Diagnosed by": "dc666555"
          }
        ]
      }
    ]

我的问题是，对于过去的诊断数组 returned，diag_doc 字段是我 "Indications"集合，对应诊断医生"Physicians"集合中的一个_key值。使用 AQL return diag_doc 的完整详细信息的最佳方法是什么？提前谢谢你。

PS: 我正在使用 ArangoDB 3.1.12

Answer 1

您可以使用子查询从 Physicians 集合中检索数据：

"Past Diagnoses": (FOR d IN i.diagnosis RETURN 
  {
    "Condition" : d.diag, 
    "Diagnosed on" : d.diag_dt,
    "Diagnosed by" : FIRST(FOR doc IN Physicians FILTER doc._key == d.diag_doc RETURN doc)
  }
)

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