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Add a findByIdOrNull extension to CrudRepository #299

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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
package org.springframework.data.repository

/**
* Retrieves an entity by its id.
*
* @param id the entity id.
* @return the entity with the given id or `null` if none found
* @author Sebastien Deleuze
*/
fun <T, ID> CrudRepository<T, ID>.findByIdOrNull(id: ID): T? = findById(id).orElse(null)
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
package org.springframework.data.repository

import com.nhaarman.mockito_kotlin.verify
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.Answers
import org.mockito.Mock
import org.mockito.junit.MockitoJUnitRunner
import org.springframework.data.repository.sample.User

/**
* @author Sebastien Deleuze
*/
@RunWith(MockitoJUnitRunner::class)
class CrudRepositoryExtensionsTests {

@Mock(answer = Answers.RETURNS_MOCKS)
lateinit var repository: CrudRepository<User, String>

@Test
fun `CrudRepository#findByIdOrNull() extension should call its Java counterpart`() {
repository.findByIdOrNull("foo")
verify(repository).findById("foo")
}
}