Varieties of data classifications for the information obtained from supabase

1

I'm encountering an issue while attempting to define the data types from Supabase. I received an error message stating:

"type '{ id: string; title: string; capacity: number | null; start_date: Date | null; start_time: string | null; end_date: Date | null; end_time: string | null ; image_url: string | null; event_participate: { ... ; }[]; }[] | null' cannot be assigned to type 'Event[]'. Cannot assign type 'null' to type 'Event[]'."

I have referred to the official documentation provided below, but unfortunately, I haven't found a solution yet. Can someone guide me on how to properly define the Array from Supabase?

Your assistance in resolving this matter would be greatly appreciated.

Below are the code snippets for reference.

#event-index.tsx

"use client";
import Link from "next/link";
import Card from "@mui/material/Card";
import CardContent from "@mui/material/CardContent";
import Typography from "@mui/material/Typography";
import { Container, CardMedia, Stack } from "@mui/material";
import GlobalHeader from "@/components/globalHeader";
import format from "date-fns/format";
import { ReactNode } from "react";

interface Event {
  // Event interface properties here...
}

// Typing for EventIndex component...

export default EventIndex;

#page.tsx

// Import statements and async function definition...

const Event = async () => {
  // Code block fetching events from Supabase...
};

export default Event;


#database.types.ts

export type Json = // Definition for JSON data type...

export interface Database {
  public: {
    Tables: {
      // Table definitions...
    };
    Views: {
      // Views definitions...
    };
    Functions: {
      // Functions definitions...
    };
    Enums: {
      // Enums definitions...
    };
    CompositeTypes: {
      // Composite types definitions...
    };
  };
}

export type Tables<T extends keyof Database["public"]["Tables"]> =
  Database["public"]["Tables"][T]["Row"];

Answer №1

It is not recommended to create your own custom types in this manner.

interface Event {
  id: string;
  title: string;
  capacity: number;
  start_date: Date;
  start_time: string;
  end_date: Date;
  end_time: string;
  image_url: string;
  event_participate: {
    length: ReactNode;
    id: string;
  };
}

Instead, utilize the types that Supabase has auto-generated for you:

type Event = Database['public']['Tables']['events']['Row']

Note that the code provided above has not been validated, but it should give you a good understanding of the concept.

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