1. Adding List Page

In Unit 2.4, we created the CRUD pages automatically with Inferencer. In this unit, we will create the CRUD pages manually using the codes generated by Inferencer. So, you can customize the pages as you wish.

Creating List Page

First, let's create our file under the src/pages/products folder. We will name it list.tsx. Then, we will copy the list page code generated by Inferencer and paste it into the file.

To copy the code and paste it into the file, follow the steps below:

1. Navigate to the localhost:3000/products in your browser.

2. Click on the "Show Code" button in the bottom right corner of the page.

3. You can see the list page code generated by Inferencer. Click on the "Copy" button to copy the code.

4. Paste the code into the you created, list.tsx file.

You can see the list page code generated by Inferencer below:

http://localhost:3000/products

Instead of coding the list page component from scratch, Inferencer created the required code base on API response, so that we can customize.

Understanding the List Component

We will go through the list page hooks one by one.

• useTable hook, imported from @refinedev/react-table package, has been developed by using the TanStack Table v8 package and useTable hook imported from @refinedev/core package.

  It provides all the features of the useTable hook from @refinedev/core package as well as the useTable hook from TanStack Table v8 package.

  It is used to fetch the data and manage the table state.

  Refer to the @refinedev/react-table useTable documentation for more information →

  Refer to the TanStack Table v8 documentation for more information →

• useNavigation is a refine hook that is used to navigate between pages. In this case, we are using it to navigate to the edit and show pages when the user clicks on the edit and show buttons in the table.

  Refer to the useNavigation documentation for more information →

Handling Relationships

Each product includes the category field which has id property. This is a foreign key that points to the categories resource which is different than "product" resource.

There is a title field In the categories resource. To display the category title in the table, we can use the useMany hook provided by refine.

This hook allows us to fetch data for multiple records in a single request by providing the id's of the related records. In this case, we need to provide the id's of the products categories. It is particularly useful when we need to fetch related data for multiple records.

Refer to the useMany documentation for more information →

In this tutorial, each product record has a category field as below:

https://api.fake-rest.refine.dev/products

{
  ...
  "category": {
    "id": 1
  }
  ...
},
{
  ...
  "category": {
    "id": 2
  }
  ...
}

We can use the useMany hook to fetch the full category records for each of these products, like this:

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

const { data } = useMany({
    resource: "categories",
    ids: products.map((product) => product.category.id),
});

This will pass the resource and ids to the dataProvider's getMany function. The dataProvider will then make a single request to the API to fetch the full records for each category related to the products. The resulting data variable will be an array of category records, like this:

[
    {
        id: 1,
        title: "mock category title",
    },
    {
        id: 2,
        title: "another mock category title",
    },
];

We can then use this data array to display the title of each category in the table.

Adding the List Page to the App

Now that we have created the list page, we need to add it to the App.tsx file.

1. Open src/App.tsx file on your editor.

2. Import the created ProductList component.

3. Replace the HeadlessInferencer component with the ProductList component.

src/App.tsx

import { Refine } from "@refinedev/core";
import routerBindings from "@refinedev/react-router-v6";
import dataProvider from "@refinedev/simple-rest";
import { HeadlessInferencer } from "@refinedev/inferencer/headless";
import { BrowserRouter, Routes, Route, Outlet } from "react-router-dom";

import { ProductList } from "pages/products/list";

const App = () => {
    return (
        <BrowserRouter>
            <Refine
                routerProvider={routerBindings}
                dataProvider={dataProvider("https://api.fake-rest.refine.dev")}
                resources={[
                    {
                        name: "products",
                        list: "/products",
                        show: "/products/show/:id",
                        create: "/products/create",
                        edit: "/products/edit/:id",
                    },
                ]}
            >
                <Routes>
                    <Route path="products">
                        <Route index element={<ProductList />} />
                        <Route
                            path="show/:id"
                            element={<HeadlessInferencer />}
                        />
                        <Route
                            path="edit/:id"
                            element={<HeadlessInferencer />}
                        />
                        <Route path="create" element={<HeadlessInferencer />} />
                    </Route>
                </Routes>
            </Refine>
        </BrowserRouter>
    );
};
export default App;

Now, we can see the list page in the browser at localhost:3000/products

Checklist

I added the list page to the app.

I understood the list page components and hooks.

I understood the relationship handling.