added mappers, updated models

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

@@ -0,0 +1,22 @@
+import { call } from '@app/common';
+import { prisma } from '@app/server/prisma/client';
+import { Book as BookSchema } from '@generated/types';
+import { Book } from '@prisma/client';
+
+export async function toBookSchema(model: Book): Promise<BookSchema> {
+  return {
+    id: model.id,
+    workingId: model.workingId,
+    createdAt: model.createdAt.toISOString(),
+    updatedAt: model.updatedAt.toISOString(),
+    wordsTotal: model.wordsTotal,
+    chaptersTotal: await call(async () => {
+      const chaptersCount = await prisma.bookChapter.count({
+        where: {
+          bookId: model.id
+        }
+      });
+      return chaptersCount;
+    })
+  };
+}