implemented ratings, fixes

app/server/graphql/resolvers/reviewCreateResolver.ts

@@ -0,0 +1,26 @@
+import { ensureIdentity } from '@app/server/helpers';
+import { IdentityContext } from '@app/server/identity';
+import { prisma, uuid } from '@app/server/prisma/client';
+import { MutationReviewCreateArgs, Review } from '@generated/types';
+import { toReviewSchema } from './mappers/reviewMapper';
+
+export async function ReviewCreateResolver(
+  _: any,
+  { input }: MutationReviewCreateArgs,
+  { identity }: IdentityContext
+): Promise<Review> {
+  ensureIdentity(identity);
+
+  if (input.text.length > 700) throw new Error('Review is too long.');
+
+  const model = await prisma.review.create({
+    data: {
+      id: uuid(),
+      text: input.text,
+      bookId: input.bookId,
+      userId: identity.id
+    }
+  });
+
+  return toReviewSchema(model);
+}