Question

我有一个sObject元素列表。我想删除具有相同记录名称的重复元素以及原始记录。

就像假设我有一个记录名称为的元素列表一样 Chair1，Chair2，Chair3，Chair4，Chair5，Chair6，Chair7，Chair1，Chair2

我想打印一个只有没有重复元素的列表。对于这种情况，我应该得到名单Chair3，Chair4，Chair5，Chair6，Chair7。

我使用以下代码来实现此功能。但我得到的记录为：Chair1，Chair2，Chair3，Chair4，Chair5，Chair6，Chair7。

在理想情况下，我们不应该获取记录Chair1，Chair2，因为这些记录已经有重复记录。

List <Chair__c> chairList = [SELECT
                             ID,
                             Name
                             FROM Chair__c
                             ORDER BY Name ASC];
System.debug('chairListOrderbyName::'+chairList);

List <String> chairNameList = new List <String>();

for(Integer i = 0; i < chairList.size();i++) {

    for(Integer j = 0;j < chairList.size();j++) {

    if(chairList[i].Name.equalsIgnoreCase(chairList[j].Name) && i != j) {

        chairList.remove(i);
        chairList.remove(j);
    }
}
}
System.debug('chairList::'+chairList);

Answer 1

如果您真正需要名称，则可以使用GROUP BY和HAVING使用纯SOQL执行此操作。像

这样的东西

SELECT Name
FROM Chair__c
GROUP BY Name
HAVING COUNT(Id) = 1 // only unique entries

如果你需要完整的sObjects，那么我会帮助Set<String>并循环结果。如果名称不在集合中 - 添加它。但如果它已经存在 - ＆gt;删除它！

实际上，让它成为地图，类似的想法......

Map<Set, Chair__c> chairs = new Map<Set, Chair__c>();
for(Chair__c c : [SELECT ...]){
    if(chairs.containsKey(c.Name)){
        chairs.remove(c.Name);
    } else {
        chairs.put(c.Name, c);
    }
}
System.debug(JSON.serializePretty(chairs));
System.debug(chairs.values());

Answer 2

尝试使用File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\exception.py" in inner 35. response = get_response(request) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response 128. response = self.process_exception_by_middleware(e, request) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response 126. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\base.py" in view 69. return self.dispatch(request, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\decorators.py" in _wrapper 62. return bound_func(*args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view 21. return view_func(request, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view 21. return view_func(request, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\decorators.py" in bound_func 58. return func.__get__(self, type(self))(*args2, **kwargs2) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\base.py" in dispatch 89. return handler(request, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\edit.py" in post 172. return super().post(request, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\edit.py" in post 142. return self.form_valid(form) File "C:\Users\Rahul\yantra_packs\yantra_packs\packsapp\views.py" in form_valid 227. MaterialRequest.objects.filter(id=s_o).update(is_allocated = True) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\manager.py" in manager_method 82. return getattr(self.get_queryset(), name)(*args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\query.py" in filter 836. return self._filter_or_exclude(False, *args, **kwargs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\query.py" in _filter_or_exclude 854. clone.query.add_q(Q(*args, **kwargs)) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\query.py" in add_q 1253. clause, _ = self._add_q(q_object, self.used_aliases) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\query.py" in _add_q 1277. split_subq=split_subq, File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\query.py" in build_filter 1215. condition = self.build_lookup(lookups, col, value) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\query.py" in build_lookup 1085. lookup = lookup_class(lhs, rhs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\lookups.py" in __init__ 18. self.rhs = self.get_prep_lookup() File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\lookups.py" in get_prep_lookup 68. return self.lhs.output_field.get_prep_value(self.rhs) File "C:\Users\Rahul\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_value 947. return int(value) Exception Type: TypeError at /employee/allotment-form/ Exception Value: int() argument must be a string, a bytes-like object or a number, not 'MaterialRequest'代替Set<String>。请参考下面的解决方案

List<String>

从列表中删除所有重复和原始元素

2 个答案: