如何在地图中使用JaVers？

Question

我有两个地图，可以由不同的作者修改。在这个特定的用例中，我有一个限制，不能使用POJO或域对象，只能使用Maps。

    @Test
    fun `Shadow from a map`() {
        val javers = JaversBuilder.javers().build()
        val exercise = mutableMapOf("_id" to "1", "title" to "my exercise", "starred" to false)
        javers.commit("bob", exercise)
        
        exercise["starred"] = true
        javers.commit("bob", exercise)
        
        exercise["title"] = "my great exercise"
        exercise["starred"] = true
        javers.commit("alice", exercise)

        val training = mutableMapOf("_id" to "2", "title" to "my training")
        javers.commit("alice", training)
        
        training["title"] = "my great training"
        javers.commit("jack", training)


        val query: JqlQuery = QueryBuilder.byInstance(exercise).build()
        val shadows: List<Shadow<Map<*,*>>> = javers.findShadows(query)
        assertThat(shadows.size, `is`(3))
    }

测试执行显示以下错误：

MALFORMED_JQL: Invalid JQL query, object passed to byInstance(Object) query should be instance of Entity or ValueObject, got MapType{ baseType: 'class java.util.LinkedHashMap' } - '{_id=1, title=my great exercise, starred=true}'.
Did you mean byInstanceId(Object localId, Class entityClass)?
JaversException MALFORMED_JQL: Invalid JQL query, object passed to byInstance(Object) query should be instance of Entity or ValueObject, got MapType{ baseType: 'class java.util.LinkedHashMap' } - '{_id=1, title=my great exercise, starred=true}'.
Did you mean byInstanceId(Object localId, Class entityClass)?
    at org.javers.repository.jql.FilterDefinition$InstanceFilterDefinition.compile(FilterDefinition.java:91)
    at org.javers.repository.jql.JqlQuery.compile(JqlQuery.java:129)
    at org.javers.repository.jql.QueryCompiler.compile(QueryCompiler.java:19)
    at org.javers.repository.jql.ShadowStreamQueryRunner$StreamQuery.<init>(ShadowStreamQueryRunner.java:59)
    at org.javers.repository.jql.ShadowStreamQueryRunner.queryForShadowsStream(ShadowStreamQueryRunner.java:34)
    at org.javers.repository.jql.QueryRunner.queryForShadowsStream(QueryRunner.java:32)
    at org.javers.core.JaversCore.findShadowsAndStream(JaversCore.java:194)
    at org.javers.core.JaversCore.findShadows(JaversCore.java:188)

我应该如何构建JqlQuery来查找阴影？

Answer 1

您可以比较两个顶级map，但不能将map提交到Javers Repository (应该抛出异常)，因为map没有标识符。