Code + comment cleanup for the entities

ref #39

src/models/entities/DistanceDonation.ts

@@ -4,19 +4,21 @@ import { Donation } from "./Donation";
 import { Runner } from "./Runner";
 
 /**
- * Defines a distance based donation.
- * Here people donate a certain amout per kilometer
+ * Defines the DistanceDonation entity.
+ * For distanceDonations a donor pledges to donate a certain amount for each kilometer ran by a runner.
 */
 @ChildEntity()
 export class DistanceDonation extends Donation {
   /**
-   * The runner associated.
+   * The donation's associated runner.
+   * Used as the source of the donation's distance.
    */
   @IsNotEmpty()
   @ManyToOne(() => Runner, runner => runner.distanceDonations)
   runner: Runner;
 
   /**
+   * The donation's amount donated per distance.
    * The amount the donor set to be donated per kilometer that the runner ran.
    */
   @Column()
@@ -26,12 +28,12 @@ export class DistanceDonation extends Donation {
 
   /**
    * The donation's amount in cents (or whatever your currency's smallest unit is.).
-   * The exact implementation may differ for each type of donation.
+   * Get's calculated from the runner's distance ran and the amount donated per kilometer.
    */
   public get amount(): number {
     let calculatedAmount = -1;
     try {
-      calculatedAmount = this.amountPerDistance * this.runner.distance;
+      calculatedAmount = this.amountPerDistance * (this.runner.distance / 1000);
     } catch (error) {
       throw error;
     }