SOQL加入查询返回sobject，而不是字段。如何使用获得的ID？

Question

我在下面有SOQL，并且得到包含Sobject ID的结果。我的假设是查询也将返回Sobject的字段。例如，我的查询尝试获取”startDay__c“（日期）就像shigotoshousai sobject的字段一样。但是查询的结果只是sobject实例的ID。

(父母: ShigotoShousai 孩子: ShigotoAssign)

sObject[] result = [
  SELECT
  ShigotoShousai__r.id, 
  ShigotoShousai__r.startDay__c
  FROM ShigotoAssign__c
];

system.debug（结果）输出

shigotoAssign_c：{id = a06500000067anjaai，shigotoshousai_c = a05500000000dlhnoaav}，shigotoAssign_c：{id = a06500000067anoaai，shigotoshousai_c = A055000000DLHNTAAV}）

我有Shigotoshousai __c Sobject而不是其财产的身份证”startDay__c“。我认为输出会像：

shigotoAssign__c:{ShigotoShousai__c=a055000000DlHnOAAV, startDay__c=2010-10-10}, 
shigotoAssign__c:{ShigotoShousai__c=a055000000DlHnTAAV, startDay__c=2010-10-13})

但是查询结果刚刚返回了我的shigotoshousai__c sobject :(

现在我知道有S的ID值higotoShousai__c 并想访问其领域，所以我确实关注了。

ShigotoShousai__c foo = (ShigotoShousai__c)result[0].get('ShigotoShousai__c');
//now I assume I can access to some fields like below
system.debug(foo.workDate);

这给了我错误：

System.TypeException: Invalid conversion from runtime 
type Id to SOBJECT:shigotoShousai__c

然后，我认为ID不能用于参考Sobject（即Shigotoshousai__c）。

但是我有它的ID ..我该如何访问，说 startDay__c？有没有办法使用此ID？

Answer 1

问题在于，您将SOQL查询结果分配给了通用Sobject []，除了ID之外，它没有其自己的任何具体字段。只要您不尝试用动态SOQL做任何喜欢的事情，请尝试这样的事情：

ShigotoAssign__c[] result = [
  SELECT
  ShigotoShousai__r.id, 
  ShigotoShousai__r.startDay__c
  FROM ShigotoAssign__c
];

for(ShigotoAssign__c s : result) {
  System.debug(s.ShigotoShousai__r.startDay__c);
}

Answer 2

也只想分享我的信息，因为它与问题有关。希望有人能找到这一点。

以下查询涉及父母，孩子，孙子和我使用Apex达到每个值。现在，我可以在Visualforce页面上显示这些价值:)

    //WORK
    public String workName { get; set; }
    public String workContent { get; set; }
    public String workCategory { get; set; }
    public String workSponsor { get; set; }
    //WORK DETAIL
    public String workDetailStartDay { get; set; }
    public String workDetailStartHour { get; set; }
    public String workDetailStartMin { get; set; }
    public String workDetailEndDay { get; set; }
    public String workDetailEndHour { get; set; }
    public String workDetailEndMin { get; set; }
    public String workDetailCategory { get; set; }
    public String workDetailDivision { get; set; }
    //WORK ASSIGN

ShigotoAssign__c[] result = [
            SELECT
            ShigotoShousai__r.Shigoto__r.name,
            ShigotoShousai__r.Shigoto__r.workContent__c,
            ShigotoShousai__r.Shigoto__r.category__c,
            ShigotoShousai__r.Shigoto__r.sponsor__c,
            ShigotoShousai__r.id, ShigotoShousai__r.startDay__c, ShigotoShousai__r.startHour__c,
            ShigotoShousai__r.startMin__c,
            ShigotoShousai__r.endDay__c, ShigotoShousai__r.endHour__c, ShigotoShousai__r.endMin__c,
            ShigotoShousai__r.workCategory__c, ShigotoShousai__r.workDivision__c,
            ShigotoShousai__r.address__c,
            id, contactStat__c
            FROM ShigotoAssign__c
            WHERE id = :workAssigned.id
        ];

    //get WORK info to show on email template page
    workName = result[0].ShigotoShousai__r.Shigoto__r.name;
    workContent = result[0].ShigotoShousai__r.Shigoto__r.workContent__c;
    workSponsor = result[0].ShigotoShousai__r.Shigoto__r.sponsor__c;
    //get WORK DETAIL info to show on email template page
    workDetailStartDay = String.valueOf(result[0].ShigotoShousai__r.startDay__c);