Tidying Up Data Layer

README.md

@@ -104,5 +104,5 @@ Just finished up the database connection, next steps:
 The database and UI are now connected, some improvements to make:
 
 - [x] Change folders to link components, remove all client state
-- [ ] Clean up the database and data fetching patterns
+- [x] Clean up the database and data fetching patterns
 - [ ] Real homepage

src/app/drive-contents.tsx

@@ -4,14 +4,14 @@ import { ChevronRight, Upload } from "lucide-react";
 import Link from "next/link";
 
 import { Button } from "~/components/ui/button";
-import type { files, folders } from "~/server/db/schema";
+import type { File, Folder } from "~/server/db/schema";
 
 import { FileRow, FolderRow } from "./file-row";
 
 export default function DriveContents(props: {
-  files: (typeof files.$inferSelect)[];
-  folders: (typeof folders.$inferSelect)[];
-  parents: (typeof folders.$inferSelect)[];
+  files: File[];
+  folders: Folder[];
+  parents: Folder[];
 }) {
   const handleUpload = () => {
     alert("Upload functionality would be implemented here");

src/app/f/[folderId]/page.tsx

@@ -1,32 +1,9 @@
-import { eq } from "drizzle-orm";
 import { z } from "zod";
 
-import { db } from "~/server/db";
-import {
-  files as fileSchema,
-  folders as folderSchema,
-} from "~/server/db/schema";
+import * as queries from "~/server/db/queries";
 
 import DriveContents from "../../drive-contents";
 
-async function getAllParents(folderId: number) {
-  const parents = [];
-  let currentId: number | null = folderId;
-  while (currentId != null) {
-    const folders = await db
-      .selectDistinct()
-      .from(folderSchema)
-      .where(eq(folderSchema.id, currentId));
-
-    if (!folders[0]) throw new Error("parent folder not found");
-
-    parents.unshift(folders[0]);
-    currentId = folders[0]?.parent; // parent can be null
-  }
-
-  return parents;
-}
-
 export default async function GoogleDriveClone(props: {
   params: Promise<{ folderId: number }>;
 }) {
@@ -37,22 +14,10 @@ export default async function GoogleDriveClone(props: {
 
   if (!success) return <div>Invalid Folder ID</div>;
 
-  const folderId = data.folderId;
-  const parentsPromise = getAllParents(folderId);
-
-  const foldersPromise = db
-    .select()
-    .from(folderSchema)
-    .where(eq(folderSchema.parent, folderId));
-  const filesPromise = db
-    .select()
-    .from(fileSchema)
-    .where(eq(fileSchema.parent, folderId));
-
   const [folders, files, parents] = await Promise.all([
-    foldersPromise,
-    filesPromise,
-    parentsPromise,
+    queries.getAllFolders(data.folderId),
+    queries.getAllFiles(data.folderId),
+    queries.getAllParentsForFolder(data.folderId),
   ]);
 
   return <DriveContents folders={folders} files={files} parents={parents} />;

src/app/file-row.tsx

@@ -1,9 +1,9 @@
 import { FileIcon, Folder as FolderIcon } from "lucide-react";
 import Link from "next/link";
 
-import type { files, folders } from "~/server/db/schema";
+import type { File, Folder } from "~/server/db/schema";
 
-export function FileRow(props: { file: typeof files.$inferSelect }) {
+export function FileRow(props: { file: File }) {
   const { file } = props;
 
   return (
@@ -29,7 +29,7 @@ export function FileRow(props: { file: typeof files.$inferSelect }) {
   );
 }
 
-export function FolderRow(props: { folder: typeof folders.$inferSelect }) {
+export function FolderRow(props: { folder: Folder }) {
   const { folder } = props;
 
   return (

src/server/db/queries.ts

@@ -0,0 +1,38 @@
+import "server-only"; // Ensure this file is only run on the server
+
+import { eq } from "drizzle-orm";
+
+import { db } from "~/server/db";
+import {
+  files_table as fileSchema,
+  folders_table as folderSchema,
+} from "~/server/db/schema";
+
+export async function getAllParentsForFolder(folderId: number) {
+  const parents = [];
+  let currentId: number | null = folderId;
+  while (currentId != null) {
+    const folders = await db
+      .selectDistinct()
+      .from(folderSchema)
+      .where(eq(folderSchema.id, currentId));
+
+    if (!folders[0]) throw new Error("parent folder not found");
+
+    parents.unshift(folders[0]);
+    currentId = folders[0]?.parent; // parent can be null
+  }
+
+  return parents;
+}
+
+export function getAllFolders(folderId: number) {
+  return db
+    .select()
+    .from(folderSchema)
+    .where(eq(folderSchema.parent, folderId));
+}
+
+export function getAllFiles(folderId: number) {
+  return db.select().from(fileSchema).where(eq(fileSchema.parent, folderId));
+}

src/server/db/schema.ts

@@ -8,7 +8,7 @@ import {
 
 const createTable = singlestoreTableCreator((name) => `drive_tutorial_${name}`);
 
-export const files = createTable(
+export const files_table = createTable(
   "files",
   {
     id: bigint("id", { mode: "number", unsigned: true })
@@ -22,7 +22,7 @@ export const files = createTable(
   (table) => [index("parent_index").on(table.parent)],
 );
 
-export const folders = createTable(
+export const folders_table = createTable(
   "folders",
   {
     id: bigint("id", { mode: "number", unsigned: true })
@@ -33,3 +33,6 @@ export const folders = createTable(
   },
   (table) => [index("parent_index").on(table.parent)],
 );
+
+export type File = typeof files_table.$inferSelect;
+export type Folder = typeof folders_table.$inferSelect;