Invalid assignment: type 'string' is incompatible with type

After updating the Angular version in my project, I encountered this issue:

The error message 'The type 'string' is not assignable to type 'ReportTeamFilter[]'' pops up.

This problem arises when I try to assign a value to searchOptions.BusinessLst using this.business.value;

business = new FormControl('');
var searchOptions: DelegateSearch = new DelegateSearch();
searchOptions.BusinessLst = this.business.value;

delegate.ts

import { ReportingFilter }
export class DelegateSearch {
public BusinessLst: ReportingTeamFilter[];
constructor() {}
}

reporting-model.ts

export class ReportingTeamFilter {

public Id: number;
public Name: string;
public Date: Date;

constructor(){}
}

Does anyone have any suggestions on how to resolve this issue?

Appreciate any help. Thank you

Answer №1

I believe the error being generated is due to Angular's new typed form feature. However, it seems that this feature was not functioning correctly during runtime before, so it might be beneficial that the error is now detected during the development phase.

The specific error encountered is as follows:

  • When you initialized business with new FormControl(''), you set this.business.value to return a string (previously, without typed forms, it would have returned any).
  • You declared BusinessLst as type ReportingTeamFilter[]
  • Subsequently, you attempted to assign a string value to this array type in the line
    searchOptions.BusinessLst = this.business.value;

This mismatch of types is causing the error to be thrown. To resolve this issue, you need to specify the correct types for each variable. Unfortunately, I do not have enough information about your business logic to assist further in determining the correct types.

Answer №2

Instead of an array of ReportingTeamFilter, you are receiving a string.

To resolve this issue, update BusinessLst to have a type of string instead.

// Before:
public BusinessLst: ReportingTeamFilter[];

// After:
public BusinessLst: string[];

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