other-emerald•2mo ago

Pulling data from hierarchical api

I have an api that exposes multiple endpoints that are hierarchical in nature. For example: /container - returns a list with minimal data like id and name /container/types - returns a list of types /container/types/type - returns a list of items that belong to each type container/types/type/id - returns a specific item I need to build a form that will contain all of the specific items, or possibly a form for each one. What is the correct way to achieve this?

5 Replies

kapa.ai•2mo ago

Hi @Stormlight. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To handle hierarchical API endpoints and build forms for specific items in Refine, you can use a combination of data fetching hooks and form components. Here's an approach to achieve this: 1. Use nested resources to represent the hierarchical structure. 2. Fetch data using appropriate data hooks. 3. Create forms for specific items using Refine's form hooks. Let's break it down: 1. Define nested resources: In your App.tsx or wherever you define your resources, structure them to reflect the API hierarchy:

<Refine
  resources={[
    {
      name: "container",
      list: "/container",
      meta: {
        canCreate: false,
      },
    },
    {
      name: "types",
      list: "/container/types",
      meta: {
        parent: "container",
      },
    },
    {
      name: "items",
      list: "/container/types/:typeId",
      show: "/container/types/:typeId/:id",
      create: "/container/types/:typeId",
      edit: "/container/types/:typeId/:id",
      meta: {
        parent: "types",
      },
    },
  ]}
  // ...other Refine configurations
/>

<Refine
  resources={[
    {
      name: "container",
      list: "/container",
      meta: {
        canCreate: false,
      },
    },
    {
      name: "types",
      list: "/container/types",
      meta: {
        parent: "container",
      },
    },
    {
      name: "items",
      list: "/container/types/:typeId",
      show: "/container/types/:typeId/:id",
      create: "/container/types/:typeId",
      edit: "/container/types/:typeId/:id",
      meta: {
        parent: "types",
      },
    },
  ]}
  // ...other Refine configurations
/>

2. Fetch data: Use the useList hook to fetch data from the hierarchical endpoints. You can use the meta property to pass additional parameters like typeId:

import { useList } from "@refinedev/core";

const { data: containers } = useList({ resource: "container" });
const { data: types } = useList({ resource: "types" });
const { data: items } = useList({
  resource: "items",
  meta: { typeId: selectedTypeId },
});

import { useList } from "@refinedev/core";

const { data: containers } = useList({ resource: "container" });
const { data: types } = useList({ resource: "types" });
const { data: items } = useList({
  resource: "items",
  meta: { typeId: selectedTypeId },
});

3. Create forms: Use the useForm hook to create forms for specific items. You can pass the typeId and id in the meta property:

import { useForm } from "@refinedev/core";

const { formProps, saveButtonProps, queryResult } = useForm({
  resource: "items",
  action: "edit",
  id: itemId,
  meta: { typeId: selectedTypeId },
});

import { useForm } from "@refinedev/core";

const { formProps, saveButtonProps, queryResult } = useForm({
  resource: "items",
  action: "edit",
  id: itemId,
  meta: { typeId: selectedTypeId },
});

Then, you can use these props in your form component:

<form {...formProps}>
  {/* Your form fields */}
  <button type="submit" {...saveButtonProps}>
    Save
  </button>
</form>

<form {...formProps}>
  {/* Your form fields */}
  <button type="submit" {...saveButtonProps}>
    Save
  </button>
</form>

This approach allows you to work with hierarchical API endpoints in Refine. You can fetch data from different levels of the hierarchy and create forms for specific items. For more detailed information on handling relationships and nested resources, you can refer to the following Refine documentation: 1. Relationships in Forms 2. Data Fetching in Refine Remember to adjust the code examples to fit your specific API structure and requirements. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@453354981907759115> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

other-emeraldOP•2mo ago

@kapa.ai please explain how this part works

import { useList } from "@refinedev/core";

const { data: containers } = useList({ resource: "container" });
const { data: types } = useList({ resource: "types" });
const { data: items } = useList({
  resource: "items",
  meta: { typeId: selectedTypeId },
});

import { useList } from "@refinedev/core";

const { data: containers } = useList({ resource: "container" });
const { data: types } = useList({ resource: "types" });
const { data: items } = useList({
  resource: "items",
  meta: { typeId: selectedTypeId },
});

Once I get the types, I'm currently trying to do

types?.data?.map((type) => {
  const { data: items } = useList({
  resource: "items",
  meta: { typeId: type.id},
});

types?.data?.map((type) => {
  const { data: items } = useList({
  resource: "items",
  meta: { typeId: type.id},
});

This results in the error Uncaught TypeError: Cannot read properties of undefined (reading 'length')

kapa.ai•2mo ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- I understand you're asking about how the useList hook works in Refine and encountering an error when trying to use it inside a map function. Let me explain this based on the information from our knowledge sources. The useList hook is a core feature of Refine used for fetching data from your API. Here's how it works: 1. The useList hook is imported from "@refinedev/core". 2. It's used to fetch a list of items from a specified resource. 3. The hook returns an object containing the fetched data and other properties like loading state and error information. Refine useList documentation provides more details on its usage. Now, regarding the error you're encountering, it's important to note that React hooks, including useList, cannot be used inside loops, conditions, or nested functions (like map). This is a fundamental rule of React Hooks. The error you're seeing (Uncaught TypeError: Cannot read properties of undefined (reading 'length')) is likely occurring because the useList hook is not being used correctly in this context. Instead of trying to use useList inside a map function, you should fetch all the necessary data at once. Here's a suggested approach: 1. First, fetch the types:

const { data: types } = useList({ resource: "types" });

const { data: types } = useList({ resource: "types" });

2. Then, if you need items for all types, you can fetch them in a single call:

const { data: allItems } = useList({
  resource: "items",
  filters: [
    {
      field: "typeId",
      operator: "in",
      value: types?.data?.map(type => type.id) || []
    }
  ]
});

const { data: allItems } = useList({
  resource: "items",
  filters: [
    {
      field: "typeId",
      operator: "in",
      value: types?.data?.map(type => type.id) || []
    }
  ]
});

This approach fetches all items for all types in a single API call, which is more efficient. You can then filter or group these items by type in your component's render logic. If your API doesn't support fetching items for multiple types at once, you might need to consider using a different approach, such as fetching items for each type when that type is selected or expanded in your UI. Remember, hooks should only be called at the top level of your React function components. For more information on this, you can refer to the React documentation on Rules of Hooks. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@453354981907759115> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

Pulling data from hierarchical api

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