Handle relational data using useMany with the foreign key field

How can I handle relational data using useMany with the foreign key field like 'product_id'?

4 Replies

Hi @Thanh Ho. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- You can handle relational data using the useMany hook in Refine. This hook is used to fetch multiple records from the API. It uses the getMany method from the dataProvider as the query function. If your data provider does not have a getMany method, useMany will use the getOne method instead, but this is not recommended as it will make requests one by one for each id. It's better to implement the getMany method in the data provider. Here is an example of how you can use the useMany hook to fetch relational data using a foreign key field like 'product_id':

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

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

const { data: products } = useMany({  
 resource: "products",  
 ids: productCategories.map((productCategory) => productCategory.productId),  
 queryOptions: {  
 enabled: productCategories.length > 0,  
 },  
});  

const { data: categories } = useMany({  
 resource: "categories",  
 ids: productCategories.map((productCategory) => productCategory.categoryId),  
 queryOptions: {  
 enabled: productCategories.length > 0,  
 },  
});

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

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

const { data: products } = useMany({  
 resource: "products",  
 ids: productCategories.map((productCategory) => productCategory.productId),  
 queryOptions: {  
 enabled: productCategories.length > 0,  
 },  
});  

const { data: categories } = useMany({  
 resource: "categories",  
 ids: productCategories.map((productCategory) => productCategory.categoryId),  
 queryOptions: {  
 enabled: productCategories.length > 0,  
 },  
});

In this example, useMany is used to fetch the products and categories of a product category. The ids property is an array of product ids or category ids that you want to fetch. The queryOptions property is used to enable or disable the query based on whether there are any product categories. For more information, you can refer to the Refine documentation on useMany (https://refine.dev/docs/data/hooks/use-many/). Please note that the actual implementation may vary based on your specific requirements and the structure of your data. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•9mo ago

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foreign-sapphireOP•9mo ago

@kapa.ai I have 2 tables: products and product_images, each product can have zero to many images with the foreign key product_id. I use useList to get products, and useMany to get related images for the product results. In this case, useMany needs to query product_images with product_id, not id. How can I do that?

foreign-sapphireOP•9mo ago

This code is helpful. Thanks.

useMany({
  resource: "posts",
  ids: [1, 2],
  meta: {
    idColumnName: "post_id",
  },
});

useMany({
  resource: "posts",
  ids: [1, 2],
  meta: {
    idColumnName: "post_id",
  },
});

https://refine.dev/docs/data/packages/supabase/#idcolumnname---using-custom-primary-key

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