useCan
useCan uses the Access Control Provider's can function as the query function for TanStack Query's useQuery. It takes the parameters that can takes. It can also be configured with queryOptions for useQuery. Returns the result of useQuery.
Usage
import { useCan } from "@refinedev/core";
const { data } = useCan({
resource: "resource-you-ask-for-access",
action: "action-type-on-resource",
params: { foo: "optional-params" },
});
Performance
As the number of points that check for access control in your app increases, the performance of your app may take a hit, especially if its access control involves remote endpoints. Caching the access control checks helps quite a bit, and since Refine uses TanStack Query, it can be easily done by confiruging the staleTime and cacheTime properties.
import { useCan } from "@refinedev/core";
// inside your component
const { data } = useCan({
resource: "resource-you-ask-for-access",
action: "action-type-on-resource",
params: { foo: "optional-params" } },
queryOptions: {
staleTime: 5 * 60 * 1000, // 5 minutes
}
});
Properties
resource required
Passes to Access Control Provider's can function's resource parameter
useCan({
resource: "resource-you-ask-for-access",
});
action required
Passes to Access Control Provider's can function's action parameter
useCan({
action: "resource-you-ask-for-access",
});
params
Passes to Access Control Provider's can function's params parameter
useCan({
params: { foo: "optional-params" },
});
queryOptions
Query options for TanStack Query's useQuery.
useCan({
queryOptions: {
staleTime: 5 * 60 * 1000, // 5 minutes
},
});
Return values
useCan will return the Query result of TanStack Query's useQuery.
For example, if you want to check if the user can create a post based on the return value:
const App = (
<Refine
// ...
accessControlProvider={{
can: async ({ resource, action }) => {
if (resource === "post" && action === "create") {
return {
can: false,
reason: "Unauthorized",
};
}
return { can: true };
},
}}
/>
);
const MyComponent = () => {
const { data: canCreatePost } = useCan({
action: "create",
resource: "post",
});
console.log(canCreatePost); // { can: false, reason: "Unauthorized" }
};
API Reference
Properties
Type Parameters
| Property | Description |
|---|---|
| CanResponse | Result data of the query HttpError |
Return values
| Description | Type |
|---|---|
Result of the TanStack Query's useQuery | QueryObserverResult<{ data: CanReturnType; }> |