Issue
I am working in Angular and I have a following situation:
my.service.ts has this class:
export class MyClass {
MyList: string[] = [];
MyString: string = '';
createString(): void {
this.MyList.forEach(s => {
this.MyString += s + ', ';
});
}
}
And my.component.ts calls it like this:
myData: MyClass[] = [];
this.myService.getMyData().subscribe(res => {
myData = res;
if (myData.length > 0) {
this.myData.forEach(x => x.createString());
}
});
VS Code recognizes the createString
function as a metod of MyClass
, but I still get an error:
ERROR TypeError: x.createString is not a function
Any explanations?
EDIT: The data comes from back end, and the back end model doesn't have this method. Maybe that is the issue?
Solution
The object coming from the server will be just a simple object not an instance of the class MyClass
. You can create instances of MyClass
and assign the values from the server object to the instance of the class:
this.myService.getMyData().subscribe(res => {
myData = res.map(o => Object.assign(new MyClass(), o));
if (myData.length > 0) {
this.myData.forEach(x => x.createString());
}
});
Answered By - Titian Cernicova-Dragomir
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