Maybe what i’m looking for is impossible but it would be very convenient for my needs
class Music extends Database {
static ref(id){return `musics/${id}`}
}
class Book extends Database {
static ref(id){return `books/${id}`}
}
class Database {
static fetch(id){
return request(Database.children.ref(id)) // <===== HERE of course the 'children' function doesn't exists
}
}
Music.fetch(‘1234’)
Book.fetch(‘9876’)
How to call a the static ref function from the static fetch function in the parent ?
This will avoid to copy the ‘fetch’ function in all children class
If this is an anti-pattern solution, what can I do ?
>Solution :
The relationship is the opposite: children can refer to their parent.
You can have a generic static method in the parent (Database) that the children just call with appropriate data:
class Database {
static fetch(data, type){
console.log(`requesting data: ${data} for type: ${type}`);
}
}
class Music extends Database {
static fetch(id){ return super.fetch(`musics/${id}`, "Music"); }
}
class Book extends Database {
static fetch(id){ return super.fetch(`musics/${id}`, "Book"); }
}
Music.fetch('1234')
Book.fetch('9876')Alternatively, the parent can still access data from this, so you can use it to access the child:
class Database {
static fetch(data){
console.log(`requesting data: ${data} for type: ${this.myType}`);
}
}
class Music extends Database {
static myType = "Music";
static fetch(id){ return super.fetch(`musics/${id}`); }
}
class Book extends Database {
static myType = "Book";
static fetch(id){ return super.fetch(`musics/${id}`); }
}
Music.fetch('1234')
Book.fetch('9876')Your code could be done with using this
class Database {
static fetch(id){
console.log(`requesting data: ${this.ref(id)}`);
}
}
class Music extends Database {
static ref(id){return `musics/${id}`}
}
class Book extends Database {
static ref(id){return `books/${id}`}
}
Music.fetch('1234')
Book.fetch('9876')However, I would advise against it. It puts all the responsibility of the inheriting classes to work the same, instead of putting all the logic in the parent and the inheriting classes do the minimal work necessary.