books/models/baseModels/PaymentFor/PaymentFor.ts

import { Doc } from 'fyo/model/doc';
import { FiltersMap, FormulaMap } from 'fyo/model/types';
import Money from 'pesa/dist/types/src/money';

export class PaymentFor extends Doc {
  formulas: FormulaMap = {
    amount: {
      formula: async () => {
        if (!this.referenceName) {
          return this.fyo.pesa(0);
        }

        const outstandingAmount = this.parentdoc!.getFrom(
          this.referenceType as string,
          this.referenceName as string,
          'outstandingAmount'
        ) as Money;

        if (outstandingAmount) {
          return outstandingAmount;
        }

        return this.fyo.pesa(0);
      },
      dependsOn: ['referenceName'],
    },
  };

  static filters: FiltersMap = {
    referenceName: () => ({
      outstandingAmount: ['>', 0],
    }),
  };
}