remove id in EntityI interface & remove usless EntitiesCollections

This commit is contained in:
2019-10-02 11:16:28 +02:00
parent 6641ed78e7
commit 2a738e0595
12 changed files with 83 additions and 176 deletions

3
.idea/.gitignore generated vendored
View File

@@ -6,4 +6,5 @@
/compiler.xml
/uiDesigner.xml
/dataSources.xml
/sonarlint/
/sonarlint/
/jarRepositories.xml

View File

@@ -38,14 +38,14 @@ class Connection(
fun <A> inTransaction(f: (Connection) -> CompletableFuture<A>) = connect().inTransaction(f)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<R>,
values: List<Any?>,
block: (QueryResult, R?) -> Unit
): R? {
val primaryObject = values.firstOrNull {
it is EntityI<*> && typeReference.type.typeName == it::class.java.name
it is EntityI && typeReference.type.typeName == it::class.java.name
} as R?
val result = exec(sql, compileArgs(values))
val json = result.rows[0].getString(0)
@@ -62,14 +62,14 @@ class Connection(
}
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
sql: String,
values: List<Any?> = emptyList(),
noinline block: SelectOneCallback<R> = {}
): R? =
select(sql, object: TypeReference<R>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<R>,
values: Map<String, Any?>,
@@ -80,14 +80,14 @@ class Connection(
}
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
sql: String,
values: Map<String, Any?>,
noinline block: SelectOneCallback<R> = {}
): R? =
select(sql, object: TypeReference<R>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<List<R>>,
values: List<Any?>,
@@ -96,7 +96,7 @@ class Connection(
val result = exec(sql, compileArgs(values))
val json = result.rows[0].getString(0)
return if (json === null) {
listOf<EntityI<*>>() as List<R>
listOf<EntityI>() as List<R>
} else {
serializer.deserializeList(json, typeReference)
}.also {
@@ -104,14 +104,14 @@ class Connection(
}
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
sql: String,
values: List<Any?> = emptyList(),
noinline block: SelectCallback<R> = {}
): List<R> =
select(sql, object: TypeReference<List<R>>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
sql: String,
page: Int,
limit: Int,
@@ -131,7 +131,7 @@ class Connection(
return line.run {
val json = rows[0].getString(0)
val entities = if (json === null) {
listOf<EntityI<*>>() as List<R>
listOf<EntityI>() as List<R>
} else {
serializer.deserializeList(json, typeReference)
}
@@ -146,7 +146,7 @@ class Connection(
}
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
sql: String,
page: Int,
limit: Int,
@@ -155,7 +155,7 @@ class Connection(
): Paginated<R> =
select(sql, page, limit, object: TypeReference<List<R>>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<List<R>>,
values: Map<String, Any?>,
@@ -166,7 +166,7 @@ class Connection(
}
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
sql: String,
values: Map<String, Any?>,
noinline block: SelectCallback<R> = {}
@@ -201,10 +201,8 @@ class Connection(
private fun compileArgs(values: List<Any?>): List<Any?> {
return values.map {
if (it is EntityI<*>) {
serializer.serialize(it).apply {
serializer.collection.set<Any?, EntityI<Any?>>(it as EntityI<Any?>)
}
if (it is EntityI) {
serializer.serialize(it)
} else {
it
}

View File

@@ -13,33 +13,33 @@ interface EmbedExecutable {
/**
* Select One entity with list of parameters
*/
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: List<Any?> = emptyList(),
block: SelectOneCallback<R> = {}
): R?
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: Map<String, Any?>,
block: SelectOneCallback<R> = {}
): R?
/* Select Miltiples */
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: List<Any?> = emptyList(),
block: SelectCallback<R> = {}
): List<R>
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: Map<String, Any?>,
block: SelectCallback<R> = {}
): List<R>
/* Select Paginated */
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
page: Int,
limit: Int,
typeReference: TypeReference<List<R>>,

View File

@@ -7,14 +7,14 @@ import fr.postgresjson.entity.EntityI
interface Executable {
/* Select One */
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<R>,
values: List<Any?> = emptyList(),
block: SelectOneCallback<R> = {}
): R?
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<R>,
values: Map<String, Any?>,
@@ -23,14 +23,14 @@ interface Executable {
/* Select Miltiples */
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<List<R>>,
values: List<Any?> = emptyList(),
block: SelectCallback<R> = {}
): List<R>
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
sql: String,
typeReference: TypeReference<List<R>>,
values: Map<String, Any?>,
@@ -39,7 +39,7 @@ interface Executable {
/* Select Paginated */
fun <R: EntityI<*>> select(
fun <R: EntityI> select(
sql: String,
page: Int,
limit: Int,

View File

@@ -17,7 +17,7 @@ class Function(val definition: Function, override val connection: Connection): E
/**
* Select One entity with list of parameters
*/
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: List<Any?>,
block: (QueryResult, R?) -> Unit
@@ -28,13 +28,13 @@ class Function(val definition: Function, override val connection: Connection): E
return connection.select(sql, typeReference, values, block)
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
values: List<Any?> = emptyList(),
noinline block: SelectOneCallback<R> = {}
): R? =
select(object: TypeReference<R>() {}, values, block)
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
value: R,
noinline block: SelectOneCallback<R> = {}
): R? =
@@ -43,7 +43,7 @@ class Function(val definition: Function, override val connection: Connection): E
/**
* Select One entity with named parameters
*/
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: Map<String, Any?>,
block: (QueryResult, R?) -> Unit
@@ -54,13 +54,13 @@ class Function(val definition: Function, override val connection: Connection): E
return connection.select(sql, typeReference, values, block)
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
values: Map<String, Any?>,
noinline block: SelectOneCallback<R> = {}
): R? =
select(object: TypeReference<R>() {}, values, block)
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
vararg values: Pair<String, Any?>,
noinline block: SelectOneCallback<R> = {}
): R? =
@@ -71,7 +71,7 @@ class Function(val definition: Function, override val connection: Connection): E
/**
* Select list of entities with list of parameters
*/
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: List<Any?>,
block: (QueryResult, List<R>) -> Unit
@@ -82,7 +82,7 @@ class Function(val definition: Function, override val connection: Connection): E
return connection.select(sql, typeReference, values, block)
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
values: List<Any?> = emptyList(),
noinline block: SelectCallback<R> = {}
): List<R> =
@@ -91,7 +91,7 @@ class Function(val definition: Function, override val connection: Connection): E
/**
* Select list of entities with named parameters
*/
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: Map<String, Any?>,
block: (QueryResult, List<R>) -> Unit
@@ -102,13 +102,13 @@ class Function(val definition: Function, override val connection: Connection): E
return connection.select(sql, typeReference, values, block)
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
values: Map<String, Any?>,
noinline block: SelectCallback<R> = {}
): List<R> =
select(object: TypeReference<List<R>>() {}, values, block)
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
vararg values: Pair<String, Any?>,
noinline block: SelectCallback<R> = {}
): List<R> =
@@ -119,7 +119,7 @@ class Function(val definition: Function, override val connection: Connection): E
/**
* Select Multiple with pagination
*/
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
page: Int,
limit: Int,
typeReference: TypeReference<List<R>>,
@@ -137,7 +137,7 @@ class Function(val definition: Function, override val connection: Connection): E
return connection.select(sql, page, limit, typeReference, values, block)
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
page: Int,
limit: Int,
values: Map<String, Any?> = emptyMap(),
@@ -145,7 +145,7 @@ class Function(val definition: Function, override val connection: Connection): E
): Paginated<R> =
select(page, limit, object: TypeReference<List<R>>() {}, values, block)
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
page: Int,
limit: Int,
vararg values: Pair<String, Any?>,

View File

@@ -2,7 +2,7 @@ package fr.postgresjson.connexion
import fr.postgresjson.entity.EntityI
data class Paginated<T: EntityI<*>>(
data class Paginated<T: EntityI>(
val result: List<T>,
val offset: Int,
val limit: Int,

View File

@@ -12,7 +12,7 @@ class Query(override val name: String, private val sql: String, override val con
/* Select One */
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: List<Any?>,
block: (QueryResult, R?) -> Unit
@@ -20,13 +20,13 @@ class Query(override val name: String, private val sql: String, override val con
return connection.select(this.toString(), typeReference, values, block)
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
values: List<Any?> = emptyList(),
noinline block: SelectOneCallback<R> = {}
): R? =
select(object: TypeReference<R>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<R>,
values: Map<String, Any?>,
block: (QueryResult, R?) -> Unit
@@ -34,7 +34,7 @@ class Query(override val name: String, private val sql: String, override val con
return connection.select(this.toString(), typeReference, values, block)
}
inline fun <reified R: EntityI<*>> selectOne(
inline fun <reified R: EntityI> selectOne(
values: Map<String, Any?>,
noinline block: SelectOneCallback<R> = {}
): R? =
@@ -42,7 +42,7 @@ class Query(override val name: String, private val sql: String, override val con
/* Select Multiples */
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: List<Any?>,
block: (QueryResult, List<R>) -> Unit
@@ -50,13 +50,13 @@ class Query(override val name: String, private val sql: String, override val con
return connection.select(this.toString(), typeReference, values, block)
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
values: List<Any?> = emptyList(),
noinline block: SelectCallback<R> = {}
): List<R> =
select(object: TypeReference<List<R>>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
typeReference: TypeReference<List<R>>,
values: Map<String, Any?>,
block: (QueryResult, List<R>) -> Unit
@@ -64,13 +64,13 @@ class Query(override val name: String, private val sql: String, override val con
return connection.select(this.toString(), typeReference, values, block)
}
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
values: Map<String, Any?>,
noinline block: SelectCallback<R> = {}
): List<R> =
select(object: TypeReference<List<R>>() {}, values, block)
override fun <R: EntityI<*>> select(
override fun <R: EntityI> select(
page: Int,
limit: Int,
typeReference: TypeReference<List<R>>,
@@ -82,7 +82,7 @@ class Query(override val name: String, private val sql: String, override val con
/* Select Paginated */
inline fun <reified R: EntityI<*>> select(
inline fun <reified R: EntityI> select(
page: Int,
limit: Int,
values: Map<String, Any?> = emptyMap(),

View File

@@ -1,42 +0,0 @@
package fr.postgresjson.entity
import kotlin.reflect.KClass
class EntitiesCollections {
private val collections: MutableMap<KClass<*>, EntityCollection<Any, EntityI<Any?>>> = mutableMapOf()
fun <I, R: EntityI<I>> get(id: I, className: KClass<R>): R? {
val collection = collections[className]
val entity = collection?.get(id!!)
return entity as R?
}
inline fun <I, reified R: EntityI<I>> get(id: I): R? {
return get(id, R::class)
}
fun <I, R: EntityI<out I?>> set(entity: R): EntitiesCollections {
if (collections[entity.className] == null) {
collections[entity.className] = EntityCollection()
}
collections[entity.className]!!.set(entity as EntityI<Any?>)
return this
}
class EntityCollection<T, E: EntityI<T?>> {
private var collection: MutableMap<T, E> = mutableMapOf()
fun get(id: T): E? {
return collection[id]
}
fun set(entity: E) {
val id = entity.id
if (id !== null) {
collection[id] = entity
}
}
}
}

View File

@@ -6,13 +6,12 @@ import java.util.*
import kotlin.reflect.KClass
/* ID */
interface EntityI<T> {
var id: T?
val className: KClass<EntityI<T>>
@JsonIgnore() get() = this::class as KClass<EntityI<T>>
interface EntityI {
val className: KClass<EntityI>
@JsonIgnore() get() = this::class as KClass<EntityI>
}
abstract class Entity<T>(override var id: T? = null): EntityI<T>
abstract class Entity<T>(open var id: T? = null): EntityI
open class UuidEntity(override var id: UUID? = UUID.randomUUID()): Entity<UUID>(id)
open class IdEntity(override var id: Int? = null): Entity<Int>(id)
@@ -57,62 +56,62 @@ class EntityDeletedAtImp: EntityDeletedAt {
}
/* Author */
interface EntityCreatedBy<T: EntityI<*>> {
interface EntityCreatedBy<T: EntityI> {
var createdBy: T?
}
interface EntityUpdatedBy<T: EntityI<*>> {
interface EntityUpdatedBy<T: EntityI> {
var updatedBy: T?
}
interface EntityDeletedBy<T: EntityI<*>> {
interface EntityDeletedBy<T: EntityI> {
var deletedBy: T?
}
class EntityCreatedByImp<UserT: EntityI<*>>(
class EntityCreatedByImp<UserT: EntityI>(
override var createdBy: UserT?
): EntityCreatedBy<UserT>
class EntityUpdatedByImp<UserT: EntityI<*>>(
class EntityUpdatedByImp<UserT: EntityI>(
override var updatedBy: UserT?
): EntityUpdatedBy<UserT>
class EntityDeletedByImp<UserT: EntityI<*>>(
class EntityDeletedByImp<UserT: EntityI>(
override var deletedBy: UserT?
): EntityDeletedBy<UserT>
/* Mixed */
class EntityDeletedImp<UserT: EntityI<*>>(
class EntityDeletedImp<UserT: EntityI>(
override var deletedBy: UserT? = null
): EntityDeletedBy<UserT>,
EntityDeletedAt by EntityDeletedAtImp()
class EntityUpdatedImp<UserT: EntityI<*>>(
class EntityUpdatedImp<UserT: EntityI>(
override var updatedAt: DateTime? = null,
override var updatedBy: UserT? = null
): EntityUpdatedBy<UserT>,
EntityUpdatedAt by EntityUpdatedAtImp()
class EntityCreatedImp<UserT: EntityI<*>>(
class EntityCreatedImp<UserT: EntityI>(
override var createdAt: DateTime? = null,
override var createdBy: UserT? = null
): EntityCreatedBy<UserT>,
EntityCreatedAt by EntityCreatedAtImp()
/* Published */
interface Published<UserT: EntityI<*>> {
interface Published<UserT: EntityI> {
var publishedAt: DateTime?
var publishedBy: UserT?
}
class EntityPublishedImp<UserT: EntityI<*>>(
class EntityPublishedImp<UserT: EntityI>(
override var publishedBy: UserT?
): Published<UserT> {
override var publishedAt: DateTime? = null
}
/* Implementation */
abstract class EntityImp<T, UserT: EntityI<*>>(
abstract class EntityImp<T, UserT: EntityI>(
updatedBy: UserT?
): Entity<T>(),
EntityCreatedAt by EntityCreatedAtImp(),
@@ -122,7 +121,7 @@ abstract class EntityImp<T, UserT: EntityI<*>>(
EntityUpdatedBy<UserT> by EntityUpdatedByImp(updatedBy),
EntityDeletedBy<UserT> by EntityDeletedByImp(updatedBy)
abstract class UuidEntityExtended<T, UserT: EntityI<*>>(
abstract class UuidEntityExtended<T, UserT: EntityI>(
updatedBy: UserT?,
publishedBy: UserT?
):

View File

@@ -4,7 +4,7 @@ import fr.postgresjson.connexion.Requester
import fr.postgresjson.entity.EntityI
import kotlin.reflect.KClass
interface RepositoryI<E: EntityI<*>> {
interface RepositoryI<E: EntityI> {
val entityName: KClass<E>
var requester: Requester
fun getClassName(): String {

View File

@@ -1,29 +1,19 @@
package fr.postgresjson.serializer
import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.core.JsonProcessingException
import com.fasterxml.jackson.core.type.TypeReference
import com.fasterxml.jackson.databind.*
import com.fasterxml.jackson.databind.deser.std.StdDeserializer
import com.fasterxml.jackson.databind.DeserializationFeature
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.PropertyNamingStrategy
import com.fasterxml.jackson.databind.SerializationFeature
import com.fasterxml.jackson.databind.module.SimpleModule
import com.fasterxml.jackson.datatype.joda.JodaModule
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import fr.postgresjson.entity.EntitiesCollections
import fr.postgresjson.entity.EntityI
import fr.postgresjson.entity.IdEntity
import fr.postgresjson.entity.UuidEntity
import java.io.IOException
import java.util.*
class Serializer(val mapper: ObjectMapper = jacksonObjectMapper()) {
var collection: EntitiesCollections = EntitiesCollections()
init {
val module = SimpleModule()
module.addDeserializer(UuidEntity::class.java, EntityUuidDeserializer(collection))
module.addDeserializer(IdEntity::class.java, EntityIdDeserializer(collection))
mapper.registerModule(module)
mapper.propertyNamingStrategy = PropertyNamingStrategy.SNAKE_CASE
@@ -32,16 +22,16 @@ class Serializer(val mapper: ObjectMapper = jacksonObjectMapper()) {
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
fun <T> serialize(source: EntityI<T>, pretty: Boolean = false): String {
fun serialize(source: EntityI, pretty: Boolean = false): String {
return if (pretty) mapper.writerWithDefaultPrettyPrinter().writeValueAsString(source)
else mapper.writeValueAsString(source)
}
fun <E: EntityI<*>> deserialize(json: String, valueTypeRef: TypeReference<E>): E {
fun <E: EntityI> deserialize(json: String, valueTypeRef: TypeReference<E>): E {
return this.mapper.readValue(json, valueTypeRef)
}
inline fun <reified E: EntityI<*>> deserialize(json: String): E? {
inline fun <reified E: EntityI> deserialize(json: String): E? {
return this.mapper.readValue(json)
}
@@ -53,50 +43,11 @@ class Serializer(val mapper: ObjectMapper = jacksonObjectMapper()) {
return deserializeList(json, object: TypeReference<E>() {})
}
fun <E: EntityI<*>> deserialize(json: String, target: E): E {
fun <E: EntityI> deserialize(json: String, target: E): E {
return mapper.readerForUpdating(target).readValue<E>(json)
}
}
fun <T> EntityI<T>.serialize(pretty: Boolean = false) = Serializer().serialize(this, pretty)
inline fun <reified E: EntityI<*>> E.deserialize(json: String) = Serializer().deserialize(json, this)
inline fun <reified E: EntityI<*>> String.deserialize() = Serializer().deserialize<E>(this)
class EntityUuidDeserializer<T: UuidEntity> @JvmOverloads constructor(vc: Class<*>? = null): StdDeserializer<T>(vc) {
var collection: EntitiesCollections = EntitiesCollections()
constructor(collection: EntitiesCollections): this() {
this.collection = collection
}
@Throws(IOException::class, JsonProcessingException::class)
override fun deserialize(jp: JsonParser, ctxt: DeserializationContext): T {
val node = jp.codec.readTree<JsonNode>(jp)
val id = node.get("id").asText()
val entity = collection.get<UUID, UuidEntity>(UUID.fromString(id))
return (entity ?: ctxt.readValue(jp, UuidEntity::class.javaObjectType)) as T
}
}
class EntityIdDeserializer<T: IdEntity> @JvmOverloads constructor(vc: Class<*>? = null): StdDeserializer<T>(vc) {
var collection: EntitiesCollections = EntitiesCollections()
constructor(collection: EntitiesCollections): this() {
this.collection = collection
}
@Throws(IOException::class, JsonProcessingException::class)
override fun deserialize(jp: JsonParser, ctxt: DeserializationContext): T {
val node = jp.codec.readTree<JsonNode>(jp)
val id = node.get("id").asInt()
val entity = collection.get<Int, IdEntity>(id)
val obj = (entity ?: ctxt.readValue(jp, UuidEntity::class.javaObjectType)) as EntityI<Int>
collection.set(obj)
return obj as T
}
}
fun EntityI.serialize(pretty: Boolean = false) = Serializer().serialize(this, pretty)
inline fun <reified E: EntityI> E.deserialize(json: String) = Serializer().deserialize(json, this)
inline fun <reified E: EntityI> String.deserialize() = Serializer().deserialize<E>(this)

View File

@@ -7,7 +7,7 @@ import org.junit.jupiter.api.TestInstance
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class EntityTest() {
private class User(override var id: Int?): EntityI<Int?>
private class User(id: Int?): Entity<Int?>(id)
private class ObjTest(var name: String): UuidEntityExtended<Int?, User>(User(1), User(2))
@Test
@@ -15,7 +15,7 @@ class EntityTest() {
val obj: ObjTest? = ObjTest("plop")
assertTrue(obj is ObjTest)
assertTrue(obj is UuidEntityExtended<Int?, User>)
assertTrue(obj is EntityI<Int?>)
assertTrue(obj is EntityI)
assertTrue(obj is Entity<Int?>)
assertTrue(obj is Published<User>)
assertTrue(obj is EntityCreatedBy<User>)