vestal steppe
I see now that ctx.auth.getUserIdentity() returns a string formatted with:
The issuer (your Convex deployment)
The user ID from your auth provider
Potentially other information to ensure uniqueness
am i supposed to be manually extracting the user ID from this string when i want to insert into my db a row that can be attributed to the user or do i misunderstand how authorized creation is done in convex?
regal nymphBOT
Hi @vestal steppe. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
You're on the right track, but there's a more straightforward way to handle this in Convex. You don't need to manually extract the user ID from the string returned by ctx.auth.getUserIdentity(). Instead, Convex provides helper functions to make this process easier, especially when using Convex Auth.
Here's how you should approach this:
If you're using Convex Auth:
Use the getAuthUserId function from @convex-dev/auth/server. This function automatically extracts the user ID for you.
import { getAuthUserId } from "@convex-dev/auth/server";
import { mutation } from "./_generated/server";
export const createUserItem = mutation({
args: { /* your args */ },
handler: async (ctx, args) => {
const userId = await getAuthUserId(ctx);
if (userId === null) {
throw new Error("Not authenticated");
}
// Now you can use userId directly in your db insert
await ctx.db.insert("items", { userId, ...args });
},
});
Convex Auth Documentation provides more details on this approach.
If you're using a third-party auth provider (like Clerk or Auth0):
You might need to store the user information first and then use that stored ID. Here's an example:
const identity = await ctx.auth.getUserIdentity();
if (!identity) {
throw new Error("Not authenticated");
}
const user = await ctx.db
.query("users")
.withIndex("by_token", (q) =>
q.eq("tokenIdentifier", identity.tokenIdentifier)
)
.unique();
if (!user) {
throw new Error("User not found");
}
// Now you can use user._id in your db insert
await ctx.db.insert("items", { userId: user._id, ...args });
This approach is detailed in the Storing Users in the Convex Database documentation.
getUserIdentity(). Instead, you either use a helper function (getAuthUserId) or query your users table to get the appropriate ID to use in your database operations.
vestal steppe
@regal nymph how does identity.subject fit into this?
<@&1228088700710293556> how does identity.subject fit into this?
@regal nymph how does identity.subject fit into this?
regal nymphBOT
Let me check the knowledge base for you again. One moment! :books:
The identity.subject field is an important part of the user identity information returned by ctx.auth.getUserIdentity() in Convex. Let me explain how it fits into the authentication process:
identity.subject is a unique identifier for the user, typically provided by the authentication provider (like Clerk or Auth0).
It's part of the UserIdentity object, which is guaranteed to have tokenIdentifier, subject, and issuer fields.
The subject field is often used as a unique identifier for the user in your application, especially when working with third-party auth providers.
Here's how you might use identity.subject:
const identity = await ctx.auth.getUserIdentity();
if (!identity) {
throw new Error("Unauthenticated call to mutation");
}
// Store user information using the subject as a unique identifier
await ctx.db.insert("users", {
clerkId: identity.subject,
name: identity.name ?? "Anonymous",
// other user fields...
});
const identity = await ctx.auth.getUserIdentity();
if (!identity) {
throw new Error("Unauthenticated call to mutation");
}
const user = await ctx.db
.query("users")
.withIndex("by_clerkId", q => q.eq("clerkId", identity.subject))
.first();
export const authRLSQuery = customQuery(query, {
args: {},
input: async (ctx, args) => {
const identity = await ctx.auth.getUserIdentity();
if (!identity) {
throw new ConvexError({
code: 'UNAUTHORIZED',
message: 'Sorry, you must be logged in to perform this action'
});
}const db = wrapDatabaseReader({ identity }, ctx.db, {
users: {
read: async (ctx, user) => ctx.identity.subject === user.clerkId
}
});
return { ctx: { ...ctx, db, identity }, args };
}
});
In these examples, `identity.subject` is used as a unique identifier for the user, often stored as `clerkId` or a similar field in the database. This allows you to link the authenticated user to their data in your Convex database without having to manually parse the `tokenIdentifier`.
The `subject` is particularly useful because it's a stable identifier provided by the auth service, making it reliable for identifying users across sessions and requests.
[Auth in Functions](<https://docs.convex.dev/auth/functions-auth>) provides more details on using authentication information in Convex functions.
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------@regal nymph does the user table that convex comes with have a username column?
regal nymphBOT
Let me check the knowledge base for you again. One moment! :books:
The default users table that comes with Convex Auth does not include a username column by default. However, you can customize the schema of the users table to include additional fields such as username.
Here's how you can customize the users table to add a username field:
import { defineSchema, defineTable } from "convex/server";
import { v } from "convex/values";
import { authTables } from "@convex-dev/auth/server";
const schema = defineSchema({
...authTables,
users: defineTable({
name: v.optional(v.string()),
image: v.optional(v.string()),
email: v.optional(v.string()),
emailVerificationTime: v.optional(v.number()),
phone: v.optional(v.string()),
phoneVerificationTime: v.optional(v.number()),
isAnonymous: v.optional(v.boolean()),
username: v.optional(v.string()), // Add the username field here
// other "users" fields...
}).index("email", ["email"]),
// Your other tables...
});
export default schema;
By adding the username field to the users table schema, you can store and manage usernames for your users. You can also add indexes or other constraints as needed to ensure uniqueness or improve query performance.
users table schema, you can refer to the Customizing Schema documentation.
vestal steppe
@regal nymph explain to me the .index. why is there email on it's own and email in a list?
regal nymphBOT
Let me check the knowledge base for you again. One moment! :books:
In Convex, the .index method is used to define indexes on tables to improve query performance. The syntax and usage can sometimes be a bit confusing, so let's break it down:
When you define an index in Convex, you specify:
Here's an example:
users: defineTable({
email: v.string(),
}).index("email", ["email"])
"email" is the name of the index. It must be unique within the users table.["email"] is a list containing the fields that the index will cover. In this case, it's a single field, email.Even if you're indexing a single field, you still provide it as a list (e.g., ["email"]). This is because indexes can cover multiple fields, and the list format allows you to specify the order of fields in the index. For example, if you wanted to index by both channel and user, you would write:
messages: defineTable({
channel: v.id("channels"),
user: v.id("users"),
}).index("by_channel_user", ["channel", "user"])
In this case, the index is named "by_channel_user" and it covers both the channel and user fields, in that order.
Indexes are crucial for optimizing query performance, especially as your dataset grows. They allow the database to quickly locate and retrieve data without scanning the entire table.
vestal steppe
@regal nymph if i want to add another index on top of an existing one would i add another call to .index?
regal nymphBOT
Let me check the knowledge base for you again. One moment! :books:
Yes, you're correct! If you want to add another index on top of an existing one, you would indeed add another call to .index(). This is how you can define multiple indexes on a single table in Convex.
Here's an example of how you would add multiple indexes to a table:
import { defineSchema, defineTable } from "convex/server";
import { v } from "convex/values";
export default defineSchema({
users: defineTable({
email: v.string(),
username: v.string(),
creationDate: v.number(),
})
.index("by_email", ["email"])
.index("by_username", ["username"])
.index("by_creation_date", ["creationDate"])
});
In this example, we've defined three separate indexes on the users table:
email fieldusername fieldcreationDate fieldEach .index() call adds a new index to the table. You can chain these calls one after another, as shown in the example.
Remember that each index you add will have some performance implications:
Therefore, it's important to add indexes judiciously, based on your query patterns and performance needs.
vestal steppe
@regal nymph how can i make a field in my schema unique
regal nymphBOT
Let me check the knowledge base for you again. One moment! :books:
To make a field unique in your Convex schema, you need to implement the uniqueness constraint in your code, as Convex doesn't have a built-in "unique" field property. However, there are a couple of approaches you can take to achieve this:
Convex Ents provides a straightforward way to define unique fields. Here's how you can do it:
import { defineTable } from "convex/server";
import { defineEnt } from "convex-ents";
export default defineSchema({
users: defineEnt({})
.field("email", { unique: true })
});
This approach is described in the Convex Ents documentation.
If you're not using Convex Ents, you can manually implement uniqueness by:
a) Creating an index on the field you want to be unique.
b) Checking for existing documents with the same value before inserting or updating.
Here's an example:
// In your schema file
export default defineSchema({
users: defineTable({
email: v.string(),
}).index("by_email", ["email"])
});
// In your mutation file
export const createUser = mutation({
args: { email: v.string() },
handler: async (ctx, args) => {
const existing = await ctx.db
.query("users")
.withIndex("by_email", (q) => q.eq("email", args.email))
.unique();
if (existing !== null) {
throw new Error(`User with email ${args.email} already exists`);
}
return ctx.db.insert("users", { email: args.email });
},
});
This approach is detailed in the Convex documentation on creating unique fields with upserts.