added resolvers, updated model, updated navbar

app/server/graphql/resolvers/bookManyResolver.ts

@@ -0,0 +1,29 @@
+import { IdentityContext } from '@app/server/identity';
+import { prisma } from '@app/server/prisma/client';
+import { BookManyOutput, QueryBookManyArgs } from '@generated/types';
+import { toBookSchema } from './mappers/bookMapper';
+
+export async function BookManyResolver(
+  _: any,
+  { input }: QueryBookManyArgs,
+  { identity }: IdentityContext
+): Promise<BookManyOutput> {
+  const { filter } = input;
+  const terms = filter.terms?.toLowerCase();
+
+  const items = await prisma.book.findMany({
+    where: {
+      OR:
+        terms != null
+          ? [{ title: { contains: terms } }, { author: { username: terms } }]
+          : undefined
+    },
+    skip: filter.offset ?? 0,
+    take: filter.size ?? 10
+  });
+
+  return {
+    items: await Promise.all(items.map(value => toBookSchema(value))),
+    total: items.length
+  };
+}