added mappers, updated models

app/server/graphql/resolvers/mappers/bookChapterMapper.ts

@@ -0,0 +1,23 @@
+import { call } from '@app/common';
+import { prisma } from '@app/server/prisma/client';
+import { BookChapter as BookChapterSchema } from '@generated/types';
+import { BookChapter } from '@prisma/client';
+
+export async function toBookChapterMapping(model: BookChapter): Promise<BookChapterSchema> {
+  return {
+    id: model.id,
+    title: model.title,
+    createdAt: model.createdAt.toISOString(),
+    updatedAt: model.createdAt.toISOString(),
+    foreword: model.foreword,
+    footnote: model.footnote,
+    reviewsTotal: await call(async () => {
+      const reviewsCount = await prisma.review.count({
+        where: {
+          bookChapterId: model.id
+        }
+      });
+      return reviewsCount;
+    })
+  };
+}