DEXIE - An operation that has a declared type which is not 'void' or 'any' should always have a return value

Looking to incorporate a function that verifies if a price falls within a certain range.

The data is stored in IndexedDB and I'm utilizing Dexie for data manipulation.

Currently facing issues in compiling my solution.

public checkPriceRange(customerCode: string, listCode: string, articleCode: string, price: number): Observable<any> {

    this._WebDBService.Articles_List.filter(function (item){
      return (item.listCode == listCode && item.articleCode == articleCode);
    }).toArray().then(
      result => {
        if(result.length != 1)
        {
          return Observable.of(false)
        }
        else{
          if(result[0].minPrice >= price && result[0].maxPrice <= price)
            return Observable.of(true)
          else
            return Observable.of(false)
        }
      }
    );
   }

Seeking guidance on the appropriate approach to using Dexie...

Just need to verify certain fields within a row of a DexieTable, nothing complex, and return an Observable...

Appreciate the assistance.

Answer №1

Please ensure to include the return keyword before executing the following line of code:

return this._WebDBService.Listino_Articoli.filter(function (i){

Answer №2

When using the Dexie method toArray(), it returns a Promise, but if you want to return an Observable instead, you can try the following approach:

You can modify your code to something like this:

public checkPrizeChange(codCli: string, codList: string, codArt: string, price: number): Observable<boolean> {

  return Observable.fromPromise(this._WebDBService.Listino_Articoli.filter(i => i.codLis == codList && i.codArt == codArt).toArray().then(
    data => {
      if(data.length != 1)
      {
        return false;
      }
      else{
        if(data[0].prezzoMin >= price && data[0].prezzoMax <= price)
          return true;
        else
          return false;
      }
    }
  );
}

Additionally, you might want to consider utilizing a compound index "[codLis+codArt]" to optimize your query performance. If you are using Dexie 2.0, you can rewrite your query to take advantage of the index like so:

this._WebDBService.Listino_Articoli.where({
  codLis: codLis,
  codArt: codArt
}).toArray()

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