Flutter SQFlite one to many relationship setup

Question

I am creating an app and need a database. The database contains a location table and point of interests table.
It's a one to many relationship.
A location has several point of interests.
Now I tried to do this relationship in flutter with sqflite, but failed. I already tried to add a Foreign Key, but it did not work.
This is only the most important part of the code.

static final String locationTable = 'location';
static final String columnLocationId = 'id';
static final String columnLocationTitle = 'title';  

static final String pointOfInterestTable = 'point_of_interest';
static final String columnPointOfInterestId = 'id';
static final String columnPointOfInterestTitle = 'title';

static final String createTableLocation = 'CREATE TABLE $locationTable('
    '$columnLocationId INTEGER PRIMARY KEY AUTOINCREMENT,'
    '$columnLocationTitle TEXT NOT NULL)';

static final String createTableLocation = 'CREATE TABLE $pointOfInterestTable('
    '$columnPointOfInterestId INTEGER PRIMARY KEY AUTOINCREMENT,'
    '$columnPointOfInterestTitle TEXT NOT NULL)';

Future<List> getPointOfInterestsOfLocations(int id) async {
    final db = await this.db;
    final maps = await db.query(
      locationTable,
      where: '$columnLocationId = ?',
      whereArgs: [id],
    );
    return maps.toList();
}

And this is the line of code for loading it in a list:

List pointOfViews = await _pointOfViewDb.getPointOfInterestsOfLocations(id: location.id);

Answer 1

It seems you need to enable foreign key support in sqlite yourself.

In sqflite you can define a function like so:

static Future _onConfigure(Database db) async {
    await db.execute('PRAGMA foreign_keys = ON');
}

and add it to your openDatabase function like so:

openDatabase(version: _databaseVersion, onCreate: _onCreate,
             onUpdate: _onUpdate, onDelete: _onDelete,
             onConfigure: _onConfigure);