metropolitan-bronze•2d ago

TData[] in getList rest data provider

how do i get the type in getList in the rest data provider Type '<TData extends BaseRecord = BaseRecord>({ resource, pagination, filters, sorters, meta }: GetListParams) => Promise<{ data: BaseRecord[]; total: number; }>' is not assignable to type '<TData extends BaseRecord = BaseRecord>(params: GetListParams) => Promise<GetListResponse<TData>>'. Type 'Promise<{ data: BaseRecord[]; total: number; }>' is not assignable to type 'Promise<GetListResponse<TData>>'. Type '{ data: BaseRecord[]; total: number; }' is not assignable to type 'GetListResponse<TData>'. Types of property 'data' are incompatible. Type 'BaseRecord[]' is not assignable to type 'TData[]'. Type 'BaseRecord' is not assignable to type 'TData'. 'BaseRecord' is assignable to the constraint of type 'TData', but 'TData' could be instantiated with a different subtype of constraint 'BaseRecord'.ts(2322) types.d.ts(400, 5): The expected type comes from property 'getList' which is declared here on type 'Omit<Required<DataProvider>, "createMany" | "updateMany" | "deleteMany">' (property) getList: <TData extends BaseRecord = BaseRecord>(params: GetListParams) => Promise<GetListResponse<TData>>

5 Replies

kapa.ai•2d ago

Hi @Joe Gaffney. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To address the type issue you're encountering with the getList method in the REST data provider, you need to properly handle the generic type TData that extends BaseRecord. The error suggests that the return type of your getList function is not correctly matching the expected type. Here's how you can modify your getList implementation to resolve this issue:

getList: async <TData extends BaseRecord = BaseRecord>({
  resource,
  pagination,
  filters,
  sorters,
  meta,
}: GetListParams): Promise<GetListResponse<TData>> => {
  // Your implementation here
  const response = await apiClient.get(`/${resource}`);
  
  return {
    data: response.data as TData[],
    total: response.headers['x-total-count'] || response.data.length,
  };
}

getList: async <TData extends BaseRecord = BaseRecord>({
  resource,
  pagination,
  filters,
  sorters,
  meta,
}: GetListParams): Promise<GetListResponse<TData>> => {
  // Your implementation here
  const response = await apiClient.get(`/${resource}`);
  
  return {
    data: response.data as TData[],
    total: response.headers['x-total-count'] || response.data.length,
  };
}

Key points to note: 1. Use the generic type <TData extends BaseRecord = BaseRecord> in the function signature. 2. Ensure the return type is Promise<GetListResponse<TData>>. 3. Cast the response data to TData[] when returning. This approach allows the getList method to work with any type that extends BaseRecord, while still maintaining type safety. For more details on implementing data providers and their methods, you can refer to the Data Provider Methods documentation (https://refine.dev/docs/data/data-provider/#methods). If you're using useList or useInfiniteList hooks with this data provider, you can specify the type when using the hook:

const { data } = useList<YourDataType>();

const { data } = useList<YourDataType>();

This will ensure that the returned data is correctly typed as YourDataType**]. For more information on using these hooks with proper typing, check the [useList Type Parameters (https://refine.dev/docs/data/hooks/use-list/#type-parameters) and useInfiniteList Type Parameters** (https://refine.dev/docs/data/hooks/use-infinite-list/#type-parameters) documentation. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2d ago

<@422289470487003153> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

metropolitan-bronzeOP•2d ago

@kapa.ai what is the type of meta

kapa.ai•2d ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- The meta parameter in refine's data provider methods, including getList, has the type MetaQuery. This type is used to pass additional information to data provider methods for customizing requests or generating queries. According to the useList API Reference (https://refine.dev/docs/data/hooks/use-list/#api-reference), the meta property is defined as:

meta: MetaQuery

meta: MetaQuery

The MetaQuery type allows you to include any additional properties that you want to pass to your data provider. It's a flexible type that can contain various key-value pairs. For example, you can use meta to pass custom headers to your API requests:

useList({
  meta: {
    headers: { "x-meta-data": "true" },
  },
});

useList({
  meta: {
    headers: { "x-meta-data": "true" },
  },
});

In your data provider implementation, you can then access and use these meta properties:

const myDataProvider = {
  getList: async ({
    resource,
    pagination,
    sorters,
    filters,
    meta,
  }) => {
    const headers = meta?.headers ?? {};
    // Use the headers in your API request
    // ...
  },
};

const myDataProvider = {
  getList: async ({
    resource,
    pagination,
    sorters,
    filters,
    meta,
  }) => {
    const headers = meta?.headers ?? {};
    // Use the headers in your API request
    // ...
  },
};

It's worth noting that in earlier versions of refine, this property was called metaData. However, as mentioned in the migration guide from 3.x to 4.x (https://refine.dev/docs/migration-guide/3x-to-4x/#update-getlist-parameters-of-dataprovider), metaData is now deprecated and meta should be used instead:

export const dataProvider = {
    getList: ({
        resource,
        pagination: {
            mode: "off" | "server" | "client",
        },
        sorters,
        filters,
        meta, // Use this instead of metaData
    }) => {
        ...
    },
};

export const dataProvider = {
    getList: ({
        resource,
        pagination: {
            mode: "off" | "server" | "client",
        },
        sorters,
        filters,
        meta, // Use this instead of metaData
    }) => {
        ...
    },
};

The meta property provides a flexible way to pass additional data to your data provider methods, allowing you to customize your API requests as needed. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2d ago

<@422289470487003153> Kapa.ai is still learning and improving, please let me know how I did by reacting below.