Typing the `custom` method in DataProvider
Hello, I am trying to type the response data from my
custom
method in the DataProvider, which uses the generic TData
to type the response. How do I define it when implementing my provider logic?7 Replies
Hi @bombillazo. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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To define the
TData
type when implementing your custom method in the DataProvider, you can use the DataProvider
type from refine. Here's an example of how to do it:
In this example, the custom
method is defined as an async function with a generic type parameter TData
. This allows you to type the response data when using the custom
method in your application.
For more information on creating a custom data provider, refer to the Create Data Provider From Scratch (https://refine.dev/docs/tutorial/understanding-dataprovider/create-dataprovider/) section in the tutorial.
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flat-fuchsia•2y ago
@kapa.ai How do I narrow the response type inside my custom function implementation to avoid type constraint errors and allow different response types depending on the input?
Let me check the knowledge base for you. One moment! :books:
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To narrow the response type inside your custom function implementation and allow different response types depending on the input, you can use TypeScript's conditional types and type inference. Here's an example of how to do it:
First, define a type that maps the input to the expected response type:
In this example,
ResourceAResponse
and ResourceBResponse
are the expected response types for resourceA
and resourceB
, respectively.
Next, update your custom method implementation to use the CustomResponseType
type:
Now, when you use the custom
method in your application, the response type will be narrowed based on the input resource:
For more information on creating a custom data provider, refer to the Create Data Provider From Scratch (https://refine.dev/docs/tutorial/understanding-dataprovider/create-dataprovider/) section in the tutorial.
----------------------
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:speech_balloon:
----------------------3. Create Data Provider From Scratch | refine
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