Query help | Convex Community | Page 1

wide bobcatBOT Nov 22, 2024, 9:26 PM

#

Hi @broken gale. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

Yes, you can perform both the mashup retrieval and user permission check on the server side using Convex. This is generally a good practice for security reasons, as it ensures that the permission check is always performed before sending sensitive data to the client. Here's how you can modify your approach:

First, let's update your Convex query function to include the permission check:

import { query } from "./_generated/server";
import { v } from "convex/values";

export const getMashupsByIds = query({
  args: { mashupIds: v.array(v.id("mashups")) },
  handler: async (ctx, args) => {
    const identity = await ctx.auth.getUserIdentity();
    if (!identity) {
      throw new Error("Not authenticated");
    }

    const { mashupIds } = args;

    // Optimize for single ID lookup
    if (mashupIds.length === 1) {
      const mashup = await ctx.db.get(mashupIds[0]);
      if (mashup && await hasPermission(ctx, identity, mashup)) {
        return [mashup];
      }
      return [];
    }

    // For multiple IDs, fetch concurrently
    const mashups = await Promise.all(
      mashupIds.map(async (id) => {
        const mashup = await ctx.db.get(id);
        return mashup && await hasPermission(ctx, identity, mashup) ? mashup : null;
      })
    );

    // Filter out any null results (IDs that don't exist or user doesn't have permission)
    return mashups.filter(Boolean);
  },
});

// Helper function to check permission
async function hasPermission(ctx, identity, mashup) {
  // Implement your permission logic here
  // For example:
  // return mashup.ownerId === identity.subject;
  // Or check against a separate permissions table
  // const permission = await ctx.db.query("permissions")...
  // return permission !== null;
}

Now, update your Next.js server component to use this query:

#

import { auth } from "@clerk/nextjs";
import { api } from "@/convex/_generated/api";
import { fetchQuery } from "convex/nextjs";
import ClientMashupDetails from "./ClientMashupDetails";

export default async function MashupDetailsPage({ params: { mashupId } }) {
  const token = await auth().getToken({ template: "convex" });

  // Fetch the mashup in the server, including permission check
  const mashups = await fetchQuery(api.mashups.getMashupsByIds, { 
    mashupIds: [mashupId]
  }, { token });

  // If no mashup is returned, the user doesn't have permission or the mashup doesn't exist
  if (mashups.length === 0) {
    return <div>You don't have permission to view this mashup or it doesn't exist.</div>;
  }

  return (
    <ClientMashupDetails mashup={mashups[0]} mashupId={mashupId} />
  )
}

This approach has several benefits:

The permission check is done on the server, which is more secure.
You're using fetchQuery (https://docs.convex.dev/api/modules/nextjs#fetchquery) from convex/nextjs, which is the correct way to fetch data in Next.js server components as per the Convex documentation (https://docs.convex.dev/client/react/nextjs/server-rendering#using-convex-to-render-server-components).
You're passing the authentication token (https://docs.convex.dev/client/react/nextjs/server-rendering#server-side-authentication) to fetchQuery, which allows the Convex function to access the user's identity.
The client component only receives the data if the user has permission to view it.

#

Remember to implement the `hasPermission` function according to your specific permission logic. This could involve checking the mashup's owner, consulting a separate permissions table, or any other logic specific to your application.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 22, 2024, 10:30 PM

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@wide bobcat ok I also need the user info on the ClientMashupDetails component. Its a client component. What do you recommend to get the user info in that component? If the user is authenticated I would like to run another query in the ClientMashupDetails. Or should I do this all in server? I am looking for performance here and to avoid unecessary calls/ auth checks

wide bobcatBOT Nov 22, 2024, 10:30 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

To get the user information in the ClientMashupDetails component and optimize for performance, you have a few options. Let's explore the best approach:

Fetch user info on the server and pass it to the client component:

This is generally the most efficient approach, as it allows you to make all necessary queries on the server and pass the data to the client component. Here's how you can modify your server component:

import { auth } from "@clerk/nextjs";
import { api } from "@/convex/_generated/api";
import { fetchQuery } from "convex/nextjs";
import ClientMashupDetails from "./ClientMashupDetails";

export default async function MashupDetailsPage({ params: { mashupId } }) {
  const token = await auth().getToken({ template: "convex" });

  // Fetch the mashup and user info in parallel
  const [mashups, userInfo] = await Promise.all([
    fetchQuery(api.mashups.getMashupsByIds, { mashupIds: [mashupId] }, { token }),
    fetchQuery(api.users.getCurrentUser, {}, { token })
  ]);

  if (mashups.length === 0) {
    return <div>You don't have permission to view this mashup or it doesn't exist.</div>;
  }

  return (
    <ClientMashupDetails 
      mashup={mashups[0]} 
      mashupId={mashupId} 
      userInfo={userInfo}
    />
  )
}

In this approach, you're fetching both the mashup and user information on the server. This is efficient because:

It reduces the number of round trips to the server.
It ensures that all necessary data is available immediately when the client component renders.
It avoids unnecessary auth checks on the client side.

For the getCurrentUser query, you would need to implement it in your Convex backend:

#

export const getCurrentUser = query({
  handler: async (ctx) => {
    const identity = await ctx.auth.getUserIdentity();
    if (!identity) {
      return null;
    }
    // Fetch and return user info from your database
    return ctx.db.query("users").filter(q => q.eq(q.field("userId"), identity.subject)).first();
  },
});

Then, in your ClientMashupDetails component, you can use the passed user info:

export default function ClientMashupDetails({ mashup, mashupId, userInfo }) {
  // Use mashup and userInfo here
  // If you need to make additional queries based on user info, you can do so here
  // using useQuery or useMutation hooks
}

This approach gives you the best performance by:

Minimizing client-side queries and auth checks.
Ensuring all necessary data is available immediately on component render.
Allowing you to make additional queries in the client component if needed, based on the user info you already have.

If you need real-time updates for the user info or mashup data, you can still use useQuery in the client component to subscribe to changes, passing the initial data from the server to avoid unnecessary loading states:

const updatedMashup = useQuery(api.mashups.getMashupsByIds, { mashupIds: [mashupId] }, { initialData: [mashup] });

This approach gives you the best of both worlds: fast initial load with server-side data fetching, and real-time updates for a responsive user experience.

Convex documentation on server-side rendering (https://docs.convex.dev/client/react/nextjs/server-rendering) provides more details on this approach, which is recommended for optimal performance and user experience.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 22, 2024, 11:02 PM

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@wide bobcat what does this line do exactly? const token = await auth().getToken({ template: "convex" });

wide bobcatBOT Nov 22, 2024, 11:02 PM

#

Let me check the knowledge base for you again. One moment! :books:

broken gale Nov 22, 2024, 11:04 PM

#

@wide bobcat what does this line do exactly? const token = await auth().getToken({ template: "convex" });

wide bobcatBOT Nov 22, 2024, 11:04 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

This line of code is specifically related to using Clerk authentication with Convex. Let me explain what it does:

auth() is a function provided by Clerk (specifically from @clerk/nextjs) that gives you access to the authentication context on the server side.
The getToken() method is called on the result of auth(). This method is used to retrieve a JSON Web Token (JWT) for the currently authenticated user.
The { template: "convex" } argument specifies that we want a token formatted specifically for use with Convex. This is a custom JWT template that you need to set up in your Clerk dashboard for Convex integration.
The await keyword is used because getToken() returns a Promise, as it might need to perform some asynchronous operations to retrieve or generate the token.
The resulting token is a string containing the JWT that Convex can use to authenticate and identify the user.

This token is then typically passed to Convex functions (like fetchQuery) in the token option, allowing Convex to authenticate the request and identify the user on the server side.

For example, as shown in the Convex documentation on server-side authentication (https://docs.convex.dev/client/react/nextjs/server-rendering#server-side-authentication):

const preloadedTasks = await fetchQuery(
  api.tasks.list,
  { list: "default" },
  { token },
);

This approach allows you to make authenticated requests to Convex from your Next.js server components, ensuring that the user's identity and permissions are respected even in server-side operations.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

#

Sorry @broken gale, I am experiencing especially high traffic right now, please try again. :technologist:

broken gale Nov 22, 2024, 11:17 PM

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@wide bobcat do you see any ares of potential performances improvements? The goal is to render as much on the server as possible. Also look for other areas of improvements you see and suggest your recommendations.

📎 page.jsx 📎 ClientMashupDetails.jsx

wide bobcatBOT Nov 22, 2024, 11:17 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

Based on the information provided and the goal of rendering as much as possible on the server, I can suggest a few potential performance improvements and recommendations:

Server-side rendering optimization:
To maximize server-side rendering, you can use the preloadQuery function instead of fetchQuery. This allows you to preload the data on the server and pass it to the client component, reducing client-side data fetching. Here's how you can modify your code:

import { preloadQuery } from "convex/nextjs";

export default async function MashupDetailsPage({ params: { mashupId } }) {
  const token = await auth().getToken({ template: "convex" });

  const preloadedMashup = await preloadQuery(api.mashups.getMashupsByIds, { 
    mashupIds: [mashupId]
  }, { token });

  const preloadedUser = await preloadQuery(api.users.getCurrentUser, {}, { token });

  return (
    <ClientMashupDetails 
      preloadedMashup={preloadedMashup} 
      preloadedUser={preloadedUser} 
      mashupId={mashupId} 
    />
  )
}

Then in your client component:

import { usePreloadedQuery } from "convex/react";

export default function ClientMashupDetails({ preloadedMashup, preloadedUser, mashupId }) {
  const mashup = usePreloadedQuery(preloadedMashup);
  const user = usePreloadedQuery(preloadedUser);

  // Rest of your component logic
}

This approach is recommended in the Convex documentation for server rendering (https://docs.convex.dev/client/react/nextjs/server-rendering#preloading-data-for-client-components).

Parallel data fetching:
If you need to fetch multiple pieces of data, consider fetching them in parallel to reduce overall loading time:

#

   const [preloadedMashup, preloadedUser] = await Promise.all([
     preloadQuery(api.mashups.getMashupsByIds, { mashupIds: [mashupId] }, { token }),
     preloadQuery(api.users.getCurrentUser, {}, { token })
   ]);

Optimize database queries:
In your getMashupsByIds query, you're using ctx.db.get() for each ID. For better performance, especially with multiple IDs, consider using a single query:
```
const mashups = await ctx.db
  .query("mashups")
  .filter(q => q.inArray(args.mashupIds, q.field("_id")))
  .collect();
```
This reduces the number of database operations.
Implement caching:
Consider implementing caching for frequently accessed data. Convex has built-in caching mechanisms, but you can also use Next.js's caching capabilities for server-rendered content.
Use Suspense for loading states:
Implement React Suspense for a better loading experience. This can help you show loading states more gracefully while data is being fetched.
Optimize authentication:
If possible, cache the auth token or user session to avoid making unnecessary token requests for each page load.
Implement pagination:
If you're dealing with large datasets, implement pagination to limit the amount of data fetched and rendered at once.
Use Edge Runtime:
Consider using Next.js Edge Runtime for faster server-side rendering, especially for dynamic content.

Remember, these suggestions should be implemented based on your specific use case and after proper testing to ensure they actually improve performance in your application.

#

Convex documentation on query performance (https://stack.convex.dev/convex-query-performance) provides more insights on optimizing your queries for better performance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 23, 2024, 2:04 AM

#

@wide bobcat any idea why these queries are running twice on first load? Only the getUserDetailsForHeader, checkOwnerShipBatch and getUserCarts run twice on first load. Otherwise its cached well after

📎 ClientMashupDetails.jsx 📎 CartProvider.jsx 📎 Header.jsx 📎 layout.jsx

wide bobcatBOT Nov 23, 2024, 2:04 AM

#

Let me check the knowledge base for you again. One moment! :books:

#

Based on the information provided, it's difficult to pinpoint the exact reason why these specific queries are running twice on the first load without seeing more of your code. However, I can suggest a few potential reasons and solutions:

React's Strict Mode:
If you're using React's Strict Mode (which is enabled by default in Next.js), it intentionally double-invokes certain functions to help identify potential issues. This could cause your queries to run twice during development.

To check if this is the case, you can temporarily disable Strict Mode in your Next.js config and see if the issue persists. However, it's generally recommended to keep Strict Mode enabled for development.
Multiple Component Mounts:
If these queries are being called in components that are mounted multiple times or in different parts of your component tree, it could lead to multiple query executions.
Server-Side Rendering (SSR) and Client-Side Hydration:
In Next.js, components can render once on the server and then again on the client during hydration. This could potentially cause queries to run twice.

To address these issues and optimize your queries, consider the following:

Use useQuery with initialData:
If you're preloading data on the server, pass it as initialData to useQuery on the client. This can prevent unnecessary refetching:
```
const userDetails = useQuery(api.users.getUserDetailsForHeader, {}, { initialData: preloadedUserDetails });
```
Implement Query Deduplication:
Convex has built-in query deduplication, but ensure you're using the latest version and that your queries are structured to take advantage of this feature.
Use Query Keys:
If you're using a custom query hook, make sure you're using proper query keys to avoid unnecessary refetches.

#

Optimize Server-Side Rendering:
Use preloadQuery on the server and usePreloadedQuery on the client as recommended in the Convex documentation for server rendering (https://docs.convex.dev/client/react/nextjs/server-rendering#preloading-data-for-client-components).
Implement Caching:
Consider using the ConvexQueryCacheProvider from the convex-helpers package to keep query subscriptions active for views that are closed and opened frequently. This can help reduce unnecessary refetches, as explained in this Discord thread about client-side caching (https://discord.com/channels/1019350475847499849/1301891937556762634).
Check for Unnecessary Re-renders:
Ensure that your components are not unnecessarily re-rendering, which could trigger multiple query executions.
Use React DevTools:
Utilize React DevTools to profile your application and identify where and why these queries are being triggered multiple times.

Remember, some level of query execution on both server and client is normal in a Next.js SSR setup. The goal is to optimize this process to avoid unnecessary data fetching while maintaining a consistent and responsive user experience.

If the issue persists after trying these solutions, you might want to create a minimal reproducible example and seek further assistance from the Convex community or support channels.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 23, 2024, 2:17 PM

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@wide bobcat i get this error when a user signs out from this page. I am using clerk for auth

wide bobcatBOT Nov 23, 2024, 2:17 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

I apologize, but I don't see any specific error message in your question. However, based on the context of using Clerk for authentication with Convex and encountering an error during sign-out, I can provide some general guidance.

A common issue that occurs when signing out in applications using Clerk and Convex is related to queries still running after the user has been logged out. This can lead to authentication errors or unexpected behavior. Here are a few steps you can take to address this:

Use the Authenticated component:
Wrap your components that make authenticated queries in the Authenticated component from convex/react. This ensures that queries are only run when the user is authenticated. Convex documentation on Clerk integration (https://docs.convex.dev/auth/clerk#logged-in-and-logged-out-views) provides more details on this approach.
```
import { Authenticated } from "convex/react";

function MyComponent() {
  return (
    <Authenticated>
      {/* Your authenticated content here */}
    </Authenticated>
  );
}
```
Handle sign-out gracefully:
Ensure that you're handling the sign-out process correctly. This might involve clearing any local state or caches that depend on the user's authentication status.
Use error boundaries:
Implement React error boundaries to catch and handle errors that might occur during the sign-out process. This can help prevent your application from crashing and provide a better user experience.
Check for authentication in your Convex functions:
In your Convex query and mutation functions, always check for user authentication before proceeding with database operations.

#

   export const myFunction = query({
     handler: async (ctx) => {
       const identity = await ctx.auth.getUserIdentity();
       if (!identity) {
         throw new Error("Not authenticated");
       }
       // Proceed with authenticated operations
     },
   });

Use useConvexAuth:
The useConvexAuth hook from convex/react can be useful for managing authentication state in your components.

import { useConvexAuth } from "convex/react";

function MyComponent() {
  const { isAuthenticated, isLoading } = useConvexAuth();
  if (isLoading) {
    return <div>Loading...</div>;
  }
  if (!isAuthenticated) {
    return <div>Please log in</div>;
  }
  // Render authenticated content
}

Without seeing the specific error message, it's difficult to provide more targeted advice. If you can share the exact error message you're seeing, I'd be happy to provide more specific guidance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 23, 2024, 2:27 PM

#

@wide bobcat here is the error again in the logs now. ```
import { fetchQuery } from "convex/nextjs";
import { api } from "@/convex/_generated/api";
import ClientMashupDetails from "@/components/ClientMashupDetails";
import { auth } from "@clerk/nextjs/server";

export default async function MashupDetailsPage({ params: { mashupId } }) {
const token = await auth().getToken({ template: "convex" });

// Preload the mashup in the server
const preloadedMashup = await fetchQuery(api.mashups.getMashupByIdNew, { 
  mashupId : mashupId
}, { token });

if (!preloadedMashup) {
  return <div className="text-white-1 text-20 font-bold">Mashup not found</div>;
}

return (
<ClientMashupDetails mashup={preloadedMashup} mashupIds={mashupId} />
)
}```

wide bobcatBOT Nov 23, 2024, 2:27 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

Thank you for providing the code snippet. However, I don't see an error message in the code you've shared. It appears to be a Next.js server component that fetches a mashup using Convex and Clerk for authentication.

Without seeing the specific error you're encountering, it's difficult to pinpoint the exact issue. However, I can provide some general advice and potential improvements for this code:

Error Handling:
Add try/catch blocks to handle potential errors during token retrieval and query execution. This can help you identify where the error is occurring.

export default async function MashupDetailsPage({ params: { mashupId } }) {
  try {
    const token = await auth().getToken({ template: "convex" });
    
    const preloadedMashup = await fetchQuery(api.mashups.getMashupByIdNew, { 
      mashupId : mashupId
    }, { token });

    if (!preloadedMashup) {
      return <div className="text-white-1 text-20 font-bold">Mashup not found</div>;
    }

    return (
      <ClientMashupDetails mashup={preloadedMashup} mashupIds={mashupId} />
    )
  } catch (error) {
    console.error('Error in MashupDetailsPage:', error);
    return <div className="text-white-1 text-20 font-bold">An error occurred</div>;
  }
}

Use preloadQuery:
As suggested in the Convex documentation for server rendering (https://docs.convex.dev/client/react/nextjs/server-rendering#preloading-data-for-client-components), consider using preloadQuery instead of fetchQuery for better performance:
```
import { preloadQuery } from "convex/nextjs";

// ... in your component
const preloadedMashup = await preloadQuery(api.mashups.getMashupByIdNew, { 
  mashupId : mashupId
}, { token });
```

#

return (
<ClientMashupDetails preloadedMashup={preloadedMashup} mashupId={mashupId} />
)


3. Handle Authentication Errors:
Ensure that your Convex query function (`getMashupByIdNew`) properly handles cases where the user might not be authenticated:

```typescript
export const getMashupByIdNew = query({
  args: { mashupId: v.string() },
  handler: async (ctx, args) => {
    const identity = await ctx.auth.getUserIdentity();
    if (!identity) {
      throw new Error("Not authenticated");
    }
    // Proceed with fetching the mashup
  },
});

Type Safety:
Ensure that mashupId is of the correct type expected by your Convex query. If it's supposed to be a string, you might want to convert it:
```
const mashupId = params.mashupId.toString();
```

If you're still encountering an error after implementing these suggestions, please provide the specific error message you're seeing. This will help in diagnosing the issue more accurately.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@broken gale Kapa.ai is still learning and improving, please let me know how I did by reacting below.

broken gale Nov 23, 2024, 2:43 PM

#

@wide bobcat do you see any opportunities for improvement here? if not can we achieve the same logic with less? is this overkill or is this actually good practive according to convex?

📎 CartProvider.jsx

wide bobcatBOT Nov 23, 2024, 2:43 PM

#

Let me check the knowledge base for you again. One moment! :books:

#

Based on the code snippet you've shared and the context of our previous conversation, I can provide some insights on potential improvements and best practices according to Convex:

Use of preloadQuery:
Your current implementation uses fetchQuery, which is good, but Convex recommends using preloadQuery for server components. This is considered a best practice as it allows for better performance and smoother integration with client-side components. Here's how you could modify your code:

import { preloadQuery } from "convex/nextjs";

export default async function MashupDetailsPage({ params: { mashupId } }) {
  const token = await auth().getToken({ template: "convex" });

  const preloadedMashup = await preloadQuery(api.mashups.getMashupByIdNew, { 
    mashupId : mashupId
  }, { token });

  if (!preloadedMashup) {
    return <div className="text-white-1 text-20 font-bold">Mashup not found</div>;
  }

  return (
    <ClientMashupDetails preloadedMashup={preloadedMashup} mashupId={mashupId} />
  )
}

This change aligns with the Convex documentation on server rendering (https://docs.convex.dev/client/react/nextjs/server-rendering#preloading-data-for-client-components).

Error Handling:
Your current implementation doesn't include explicit error handling. Adding a try/catch block could improve robustness:

try {
  const token = await auth().getToken({ template: "convex" });
  const preloadedMashup = await preloadQuery(api.mashups.getMashupByIdNew, { 
    mashupId : mashupId
  }, { token });

  if (!preloadedMashup) {
    return <div className="text-white-1 text-20 font-bold">Mashup not found</div>;
  }

#

return (
<ClientMashupDetails preloadedMashup={preloadedMashup} mashupId={mashupId} />
)
} catch (error) {
console.error('Error fetching mashup:', error);
return <div className="text-white-1 text-20 font-bold">An error occurred</div>;
}


3. Type Safety:
Ensure that `mashupId` is of the correct type expected by your Convex query. If it's supposed to be a string, you might want to convert it:

```typescript
const mashupId = params.mashupId.toString();

Overall, your current implementation is not overkill and follows good practices. The logic is straightforward and focused on its primary task. The main improvement would be switching to preloadQuery as per Convex recommendations.

If you're looking to simplify further, you could potentially combine the null check and the component rendering:

return preloadedMashup 
  ? <ClientMashupDetails preloadedMashup={preloadedMashup} mashupId={mashupId} />
  : <div className="text-white-1 text-20 font-bold">Mashup not found</div>;

However, this is more a matter of coding style preference rather than a significant optimization.

In conclusion, your current implementation is generally good practice according to Convex, with the main suggestion being to use `preloadQuery` instead of `fetchQuery`. The other suggestions are minor improvements that could enhance error handling and type safety.

#Query help

Remember to implement the hasPermission function according to your specific permission logic. This could involve checking the mashup's owner, consulting a separate permissions table, or any other logic specific to your application.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Convex documentation on server-side rendering (https://docs.convex.dev/client/react/nextjs/server-rendering) provides more details on this approach, which is recommended for optimal performance and user experience.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

This approach allows you to make authenticated requests to Convex from your Next.js server components, ensuring that the user's identity and permissions are respected even in server-side operations.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Convex documentation on query performance (https://stack.convex.dev/convex-query-performance) provides more insights on optimizing your queries for better performance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If the issue persists after trying these solutions, you might want to create a minimal reproducible example and seek further assistance from the Convex community or support channels.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Without seeing the specific error message, it's difficult to provide more targeted advice. If you can share the exact error message you're seeing, I'd be happy to provide more specific guidance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If you're still encountering an error after implementing these suggestions, please provide the specific error message you're seeing. This will help in diagnosing the issue more accurately.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

In conclusion, your current implementation is generally good practice according to Convex, with the main suggestion being to use preloadQuery instead of fetchQuery. The other suggestions are minor improvements that could enhance error handling and type safety.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember to implement the `hasPermission` function according to your specific permission logic. This could involve checking the mashup's owner, consulting a separate permissions table, or any other logic specific to your application.

In conclusion, your current implementation is generally good practice according to Convex, with the main suggestion being to use `preloadQuery` instead of `fetchQuery`. The other suggestions are minor improvements that could enhance error handling and type safety.