Typesafe Supabase Flutter Queries

Supabase Flutter Types? In web development, supabase provide you with an API to generate typescript types to make typesafe queries. But what about for flutter? for dart? That's what this is all about

Yes we can generate dart classes directly from you supabase schema in order to achieve Typesafe Queries Flutter Supabase

Supabase Schema Dart Class Generator using this tool you can generate dart class via WebApp or CLI

1. Assuming the following table schema

create table
  public.books (
    id bigint generated by default as identity,
    name character varying not null,
    description text null,
    price integer not null,
    created_at timestamp with time zone not null default now(),
    constraint books_pkey primary key (id)
  ) tablespace pg_default;

2. Use the CLI or the Web App to generate dart classes

class Books {
  final BigInt id;
  final String name;
  final String? description;
  final int price;
  final DateTime created_at;

  const Books({
    required this.id,
    required this.name,
    this.description,
    required this.price,
    required this.created_at,
  });

  static String get table_name => 'books';
  static String get c_id => 'id';
  static String get c_name => 'name';
  static String get c_description => 'description';
  static String get c_price => 'price';
  static String get c_created_at => 'created_at';
  static Map<String, dynamic> insert({
    BigInt? id,
    required String name,
    String? description,
    required int price,
    DateTime? created_at,
  }) {
    return {
      if (id != null) 'id': id.toString(),
      'name': name.toString(),
      if (description != null) 'description': description.toString(),
      'price': price.toString(),
      if (created_at != null) 'created_at': created_at.toUtc().toString(),
    };
  }

  static Map<String, dynamic> update({
    BigInt? id,
    String? name,
    String? description,
    int? price,
    DateTime? created_at,
  }) {
    return {
      if (id != null) 'id': id.toString(),
      if (name != null) 'name': name.toString(),
      if (description != null) 'description': description.toString(),
      if (price != null) 'price': price.toString(),
      if (created_at != null) 'created_at': created_at.toUtc().toString(),
    };
  }

  factory Books.fromJson(Map<String, dynamic> json) {
    return Books(
      id: BigInt.parse(json['id'].toString()),
      name: json['name'] as String,
      description:
          json['description'] != null ? json['description'] as String : null,
      price: json['price'] as int,
      created_at: DateTime.parse(json['created_at'].toString()),
    );
  }
}

3. Using the generated class

we now have a typesafe'ish to interact with the database.

Getting Table Name

  Books.table_name // "books"

Fetch Data

// fetchedBooks is a typeof List<Books>
final books = await supabase
      .books
      .select("*")
      .withConverter((data) => data.map(Books.fromJson).toList());

Insert Data

yes, we know which ones is required and which ones are optional

final data = Books.insert(
  name: 'Learn Flutter',
  description: 'Endless brackets and braces',
  price: 2,
);
await supabase.books.insert(data);

Inset Many Data

final many_data = [
  Books.insert(
    name: 'Learn Minecraft',
    description: 'Endless blocks and bricks',
    price: 2,
  ),
  Books.insert(
    name: 'Description is optional',
    created_at: DateTime.now(),
    price: 2,
  ),
];
await supabase.books.insert(many_data);

Update Data

final newData = Books.update(
  name: 'New Book Name',
);
await supabase.books.update(newData).eq(Books.c_id, 1);

Delete Data

await supabase.books.delete().eq(Books.c_id, 1);

How it works is that it uses the rest api to fetch for your schemas and then constructs the dart classes for you. Is it safe? yes first of all the project is open source and they api is used by other tools like this one that visualizes your database.

Is this only for flutter? no you can use it in a normal Dart Project.

Im trying to make it better for the community i would really appreciate some help and suggestions to improve it. especially the process of parsing the data to dart types, but either way the generated classes are tested for runtime for most supabase / postgres types

mmvergara / supadart

Typesafe queries in Supabase Flutter! Generate Flutter / Dart 🎯 classes from your Supabase schema.

Supadart 🎯

Typesafe Supabase Flutter Queries
Generate Flutter / Dart 🎯 classes from your Supabase schema.

// allBooks is a typeof List<Books>
final allBooks = await supabase
      .books
      .select("*")
      .withConverter(Books.converter);

Table of Contents 📚

• Generate Dart Classes
  • Pre-requisites
  • Generate Dart Classes
    • Using the Web App
    • Using the Dart CLI
• Example Usage
  • Fetch Data
  • Fetch Single Data
  • Insert Data
  • Insert Many Data
  • Update Data
  • Delete Data
  • Enums CRUD
  • Column Selection Queries

Features 🚀

• 🌐 Cli and Web App
• 🛠️ Typesafe Queries (Create, Read, Equality)
• 🧱 Immutable Generated Classes
• 🗂️ Roundtrip Serialization fromJson to toJson and back
• 📊 Supports Column Selection Queries
• 🔢 Supports all Supabase Major datatypes
• 🗂️ Supports Defined as array types
• 🗂️ Supports Enums

Conversion Table 📊

Supabase Identifier	PostgreSQL Format	JSON Type	Dart Type	Runtime Tested
# int2	smallint	integer	int	type ✅ type[]✅
# int4	integer	integer	int	type

…

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