Comment count API endpoint

server/src/routes/comment.rs

@@ -4,7 +4,7 @@ use crate::types::{CommentQueryParams, NewComment};
 use crate::ServerState;
 
 use actix_web::get;
-use actix_web::web::{Data, Query};
+use actix_web::web::{Data, Path, Query};
 use actix_web::{post, web::Json, HttpResponse, Responder, Result};
 use log::info;
 
@@ -78,3 +78,22 @@ pub async fn new_comment(
         }
     }
 }
+
+#[get("/posts/{id}/comments/count")]
+pub async fn get_comment_count(
+    path: Path<i64>,
+    state: Data<ServerState>,
+) -> Result<impl Responder> {
+    let post_id = path.into_inner();
+
+    let count = sqlx::query!(
+        "SELECT COUNT(*) FROM comments WHERE parent_post_id = $1",
+        post_id
+    )
+    .fetch_one(&state.pool)
+    .await
+    .unwrap()
+    .count;
+
+    return Ok(HttpResponse::Ok().json(count));
+}