Closed as not planned
Description
I would like to perform type-safe queries using R2dbcTemplate. My goal is to achieve functionality similar to MongoDB's template, as you suggested—reference test code.
However, there’s an issue with handling column names, as described in this issue. I’m considering a default strategy for resolving column names, though this might limit the flexibility of custom column name strategies, similar to MongoDB’s template, which only considers property names.
Are there any considerations I should keep in mind?
extension
import org.springframework.data.relational.core.query.Criteria
import org.springframework.data.relational.core.query.Criteria.CriteriaStep
import org.springframework.data.util.ParsingUtils
import kotlin.reflect.KProperty
fun where(key: KProperty<*>): CriteriaStep = Criteria.where(key.toColumn())
internal fun KProperty<*>.toColumn(): String = ParsingUtils.reconcatenateCamelCase(this.name, "_")test
Since CriteriaBuilder doesn't override equals, I'm using toString for comparison.
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import org.springframework.data.relational.core.query.Criteria
class CriteriaExtensionsKtTest {
@Test
fun `where(KProperty) should equal Criteria where()`() {
val typedCriteria = where(Customer::firstName).`is`("John").toString()
val classicCriteria = Criteria.where("first_name").`is`("John").toString()
assertThat(typedCriteria).isEqualTo(classicCriteria)
}
class Customer(val firstName: String, val lastName: String)
}