feature #14: create route for unfollow article

src/main/kotlin/fr/dcproject/repository/Follow.kt

@@ -21,5 +21,16 @@ open class Follow <T: EntityI<UUID>>(override var requester: Requester): Reposit
                 "citizen_id" to follow.citizen.id
             )
     }
+
+    fun unfollow(follow: FollowEntity<T>) {
+        val reference = follow.target::class.simpleName!!.toLowerCase()
+        requester
+            .getFunction("unfollow")
+            .sendQuery(
+                "reference" to reference,
+                "target_id" to follow.target.id,
+                "citizen_id" to follow.citizen.id
+            )
+    }
 }
 class FollowArticleRepository(override var requester: Requester): Follow<ArticleEntity>(requester)

src/main/kotlin/fr/dcproject/routes/Follow.kt

@@ -7,6 +7,7 @@ import fr.dcproject.repository.FollowArticleRepository
 import io.ktor.application.call
 import io.ktor.http.HttpStatusCode
 import io.ktor.locations.KtorExperimentalLocationsAPI
+import io.ktor.locations.delete
 import io.ktor.locations.post
 import io.ktor.response.respond
 import io.ktor.routing.Route
@@ -28,4 +29,9 @@ fun Route.followArticle(repo: FollowArticleRepository) {
         repo.follow(FollowEntity(target = it.article, citizen = currentCitizen))
         call.respond(HttpStatusCode.Created)
     }
+
+    delete<Paths.ArticleFollowRequest> {
+        repo.unfollow(FollowEntity(target = it.article, citizen = currentCitizen))
+        call.respond(HttpStatusCode.NoContent)
+    }
 }