Writing data to Database | Remix Supabase SaaS Kit

Learn how to write, update and delete data using the Supabase Database in Remix Supabase SaaS Kit project.

Similarly to reading data, we may want to create a custom hook also when we write, update or delete data to our Supabase database.

Assuming we have an entity called tasks, and we want to create a hook to create a new Task, we can do the following.

First, we create a new hook at lib/tasks/hooks/use-create-task.ts
We add the tasks table name to lib/db-tables.ts
We create a mutations.ts file within lib/tasks

export const TASKS_TABLE = `tasks`;

In our mutations file, we will add all the mutations we want to perform on the tasks table. In this case, we will add a createTask mutation.

export function createTask(
  client: Client,
  task: Task,
) {
  return client.from(TASKS_TABLE).insert(task).throwOnError();
}

Now, we can use the createTask mutation in our useCreateTask hook.

We will be using the useMutation hook from react-query to create our hook.

lib/tasks/hooks/use-create-task.ts

function useCreateTaskMutation(task: Task) {
 const client = useSupabase();
 return useMutation(
   async (task: Task) => {
     return createTask(client, task);
   }
 );
}
export default useCreateTaskMutation;

Let's take a look at a complete example of a form that makes a request using the hook above:

components/tasks/CreateTaskForm.tsx

import { useNavigate } from '@remix-run/react';
import type { FormEventHandler } from 'react';
import { useCallback } from 'react';
import { toast } from 'sonner';
import TextField from '~/core/ui/TextField';
import Button from '~/core/ui/Button';
import useCreateTaskMutation from '~/lib/tasks/hooks/use-create-task';
import useCurrentOrganization from '~/lib/organizations/hooks/use-current-organization';
const CreateTaskForm = () => {
 const createTaskMutation = useCreateTaskMutation();
 const navigate = useNavigate();
 const organization = useCurrentOrganization();
 const organizationId = organization?.id as number;
 const onCreateTask: FormEventHandler<HTMLFormElement> = useCallback(
   async (event) => {
     event.preventDefault();
     const target = event.currentTarget;
     const data = new FormData(target);
     const name = data.get('name') as string;
     const dueDate = (data.get('dueDate') as string) || getDefaultDueDate();
     if (name.trim().length < 3) {
       toast.error('Task name must be at least 3 characters long');
       return;
     }
     const task = {
       organizationId,
       name,
       dueDate,
       done: false,
     };
     // create task
     await createTaskMutation.mutateAsync(task);
     // redirect to /tasks
     return navigate(`/tasks`);
   },
   [navigate, createTaskMutation, organizationId]
 );
 return (
   <form onSubmit={onCreateTask}>
     <div>
       <TextField.Label>
         Name
         <TextField.Input
           required
           name={'name'}
           placeholder={'ex. Launch on IndieHackers'}
         />
         <TextField.Hint>Hint: whatever you do, ship!</TextField.Hint>
       </TextField.Label>
       <TextField.Label>
         Due date
         <TextField.Input name={'dueDate'} type={'date'} />
       </TextField.Label>
       <div>
         <Button>Create Task</Button>
       </div>
     </div>
   </form>
 );
};
export default CreateTaskForm;
function getDefaultDueDate() {
 const date = new Date();
 date.setDate(date.getDate() + 1);
 date.setHours(23, 59, 59);
 return date.toDateString();
}