New route to delete grades

ui/src/lib/grades.js

@@ -0,0 +1,31 @@
+export class Grade {
+  constructor(res) {
+    if (res) {
+      this.update(res);
+    }
+  }
+
+  update({ id, login, id_user, id_work, date, score, comment }) {
+    this.id = id;
+    this.login = login;
+    this.id_user = id_user;
+    this.id_work = id_work;
+    this.date = date;
+    this.score = score;
+    this.comment = comment;
+  }
+
+  async delete() {
+    if (this.id) {
+      const res = await fetch(`api/works/${this.id_work}/grades/${this.id}`, {
+        method: 'DELETE',
+        headers: {'Accept': 'application/json'},
+      });
+      if (res.status == 200) {
+        return true;
+      } else {
+        throw new Error((await res.json()).errmsg);
+      }
+    }
+  }
+}

ui/src/lib/works.js

@@ -1,3 +1,5 @@
+import { Grade } from '$lib/grades';
+
 export class Work {
   constructor(res) {
     this.kind = "w";
@@ -110,7 +112,7 @@ export class Work {
       headers: {'Accept': 'application/json'},
     });
     if (res.status == 200) {
-      return await res.json();
+      return (await res.json()).map((g) => new Grade(g));
     } else {
       throw new Error((await res.json()).errmsg);
     }