Javers v5.6.3
我有一个父实体,其中包含一个子实体列表。当我比较2个父母列表并且在一个孩子中发现一个更改时,我需要知道哪个父母包含更改后的孩子。
我的实体
:@TypeName("Parent")
class Parent {
@Id
private String parentId;
private Set<Child> children;
}
@TypeName("Child")
class Child {
@Id
private String childId;
private String someProp;
}
我要比较的内容:
为了简洁起见,切换到Groovy:
def list1 = [
new Parent(parentId:'p1', children: [new Child(childId: 'c1')]),
new Parent(parentId:'p2', children: [new Child(childId: 'c2', someProp: 'fig')])
]
def list2 = [
new Parent(parentId:'p1', children: [new Child(childId: 'c1', someProp: 'apple')]),
new Parent(parentId:'p2', children: [new Child(childId: 'c2', someProp: 'fig')])
]
我如何与众不同:
Javers javers = JaversBuilder.javers()
.withListCompareAlgorithm(ListCompareAlgorithm.AS_SET)
.build();
Diff diff = javers.compareCollections(list1, list2);
System.out.println(diff);
输出:
Diff:
* changes on Child/c1 :
- 'someProp' value changed from '' to 'apple'
我的问题:
我如何发现哪个父级包含Child / c1?
这类似于shouldDetectSalaryChange() example,除了我有很多老板。使用该示例,给定具有不同下属的老板列表,那么如何找出Great Developer
的老板?
我是否需要创建一个自定义的Parent
比较器,还是有一种从内置比较器中找出答案的方法?
答案 0 :(得分:1)
具有此映射,您无法发现哪个Parent包含Child / c1,因为Child类被映射为Entity。因此Javers不知道这种亲子关系。
您可以更改Child类到ValueObject的映射以使此关系明确:
@TypeName("Parent")
class Parent {
@Id
private String parentId
private Set<Child> children
}
@TypeName("Child")
class Child {
private String childId
private String someProp
}
然后:
Javers javers = JaversBuilder.javers()
.withListCompareAlgorithm(ListCompareAlgorithm.AS_SET)
.wi
.build()
Diff diff = javers.compareCollections(list1, list2, Parent)
println(diff)
打印:
Diff:
* new object: Parent/p1#children/5f6ade8312fb0c5d60f756841e23af65
* object removed: Parent/p1#children/9de1d946eab394f971263c33e297f86d
* changes on Parent/p1 :
- 'children' collection changes :
. 'Parent/p1#children/9de1d946eab394f971263c33e297f86d' removed
. 'Parent/p1#children/5f6ade8312fb0c5d60f756841e23af65' added