adverse-sapphire•3w ago

Custom dataProvider create and update errors

Hi, I am getting this error in my customDataProvider, How can I solve it Type '<TData extends BaseRecord = BaseRecord, TVariables extends ILead = ILead>({ variables }: CreateParams<TVariables>) => Promise<CreateResponse<TData>>' is not assignable to type '<TData extends BaseRecord = BaseRecord, TVariables = {}>(params: CreateParams<TVariables>) => Promise<CreateResponse<TData>>'. Types of parameters '__0' and 'params' are incompatible. Type 'CreateParams<TVariables>' is not assignable to type 'CreateParams<ILead>'. Type 'TVariables' is not assignable to type 'ILead'.ts(2322) types.d.ts(403, 53): This type parameter might need an extends ILead constraint. types.d.ts(403, 5): The expected type comes from property 'create' which is declared here on type 'CustomDataProvider'

2 Replies

kapa.ai•3w ago

Hi @muthaiga. 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 error you're encountering in your custom dataProvider, it seems like the issue is related to the type constraints of the TVariables parameter in your create and update methods. Specifically, the error indicates that TVariables should extend ILead. Here's a step-by-step guide to resolve this issue: 1. Ensure Type Constraints: Make sure that the TVariables type parameter in your create and update methods extends ILead. 2. Adjust Method Signatures: Update the method signatures to include the necessary type constraints. Here's an example of how you can adjust your create and update methods:

import { DataProvider, BaseRecord, CreateParams, CreateResponse, UpdateParams, UpdateResponse } from "@refinedev/core";

interface ILead {
    // Define the properties of ILead here
}

export const customDataProvider: DataProvider = {
    create: async <TData extends BaseRecord = BaseRecord, TVariables extends ILead = ILead>(
        params: CreateParams<TVariables>
    ): Promise<CreateResponse<TData>> => {
        const { variables } = params;
        // Your create logic here
        return {
            data: {} as TData,
        };
    },
    update: async <TData extends BaseRecord = BaseRecord, TVariables extends ILead = ILead>(
        params: UpdateParams<TVariables>
    ): Promise<UpdateResponse<TData>> => {
        const { variables } = params;
        // Your update logic here
        return {
            data: {} as TData,
        };
    },
    // Implement other methods as needed
};

import { DataProvider, BaseRecord, CreateParams, CreateResponse, UpdateParams, UpdateResponse } from "@refinedev/core";

interface ILead {
    // Define the properties of ILead here
}

export const customDataProvider: DataProvider = {
    create: async <TData extends BaseRecord = BaseRecord, TVariables extends ILead = ILead>(
        params: CreateParams<TVariables>
    ): Promise<CreateResponse<TData>> => {
        const { variables } = params;
        // Your create logic here
        return {
            data: {} as TData,
        };
    },
    update: async <TData extends BaseRecord = BaseRecord, TVariables extends ILead = ILead>(
        params: UpdateParams<TVariables>
    ): Promise<UpdateResponse<TData>> => {
        const { variables } = params;
        // Your update logic here
        return {
            data: {} as TData,
        };
    },
    // Implement other methods as needed
};

In this example, the TVariables type parameter is constrained to extend ILead, which should resolve the type error. For more information on creating and customizing data providers, you can refer to the Refine documentation on data providers (https://refine.dev/docs/data/data-provider/#faq). If you need to override specific methods of existing data providers, you can use the spread syntax as shown in the example for overriding the update method (https://refine.dev/docs/data/data-provider/#faq). If you continue to face issues, please provide more details or refer to the Refine GitHub issues (https://github.com/refinedev/refine/issues) for additional support. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•3w ago

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