Salesforce 获取选项列表字段的依赖关系

public static Map<String, List<String>> getFieldDependencies(String objectName, String controllingField, String dependentField) {  
    Map<String, List<String>> controllingInfo = new Map<String, List<String>>();  
  
    Schema.SObjectType objType = Schema.getGlobalDescribe().get(objectName);  
    List<Schema.PicklistEntry> controllingValues = objType.getDescribe().fields.getMap().get(controllingField).getDescribe().getPicklistValues();  
    List<Schema.PicklistEntry> dependentValues = objType.getDescribe().fields.getMap().get(dependentField).getDescribe().getPicklistValues();  
  
    for(Schema.PicklistEntry currControllingValue : controllingValues) {  
        controllingInfo.put(currControllingValue.getLabel(), new List<String>());  
    }  
  
    for(Schema.PicklistEntry currDependentValue : dependentValues) {  
        PicklistValueInfo info = (PicklistValueInfo) JSON.deserialize(JSON.serialize(currDependentValue), PicklistValueInfo.class);  
        String hexString = EncodingUtil.convertToHex(EncodingUtil.base64Decode(info.ValidFor)).toUpperCase();  

        Integer baseCount = 0;  
  
        for(Integer curr : hexString.getChars()) {  
            Integer val = 0;  
  
            if(curr >= 65) {  
                val = curr - 65 + 10;  
            } else {  
                val = curr - 48;  
            }  
  
            if((val & 8) == 8) {  
                controllingInfo.get(controllingValues[baseCount + 0].getLabel()).add(currDependentValue.getLabel());  
            }  
            if((val & 4) == 4) {  
                controllingInfo.get(controllingValues[baseCount + 1].getLabel()).add(currDependentValue.getLabel());  
            }  
            if((val & 2) == 2) {  
                controllingInfo.get(controllingValues[baseCount + 2].getLabel()).add(currDependentValue.getLabel());  
            }  
            if((val & 1) == 1) {  
                controllingInfo.get(controllingValues[baseCount + 3].getLabel()).add(currDependentValue.getLabel());  
            }  
            baseCount += 4;  
        }  
    }  
    System.debug('ControllingInfo: ' + controllingInfo);  
    return controllingInfo;  
}

调用示例：

String objectName = 'Lead';  // 字段所属的SObject
String controllingField = 'Industry_Picklist__c';  // 控制的字段API 
String dependentField = 'Secondary_Industry_Picklist__c';  // 被控制(依赖)的字段API
getFieldDependencies(objectName, controllingField, dependentField);

输出结果：

ControllingInfo: {工业=(汽车, 钢铁), 娱乐=(数码, 电商}

注意： 然而这种方式不能通过“记录类型”去筛选，返回的Map是整个选项列表的依赖关系。如果需要按“记录类型”去筛选，可以通过Meatadata的方式获取依赖关系，这个没有实验，这种方式比较繁琐且速度也比较慢，可以参考这个链接：apex-mdapi 中的getDependentPicklistValuesByRecordType()

参考文档：(1) How To Query Salesforce Picklist Field Values Using SOQL?、(2) Get lists of dependent picklist options in Apex