Implemented the donation creation action models

ref #66

src/models/actions/create/CreateDistanceDonation.ts

@@ -0,0 +1,52 @@
+import { IsInt, IsPositive } from 'class-validator';
+import { getConnection } from 'typeorm';
+import { RunnerNotFoundError } from '../../../errors/RunnerErrors';
+import { DistanceDonation } from '../../entities/DistanceDonation';
+import { Runner } from '../../entities/Runner';
+import { CreateDonation } from './CreateDonation';
+
+/**
+ * This class is used to create a new FixedDonation entity from a json body (post request).
+ */
+export class CreateDistanceDonation extends CreateDonation {
+
+    /**
+     * The donation's associated runner.
+     * This is important to link the runner's distance ran to the donation.
+     */
+    @IsInt()
+    @IsPositive()
+    runner: number;
+
+    /**
+     * The donation's amount per distance (full kilometer aka 1000 meters).
+     * The unit is your currency's smallest unit (default: euro cent).
+     */
+    @IsInt()
+    @IsPositive()
+    amountPerDistance: number;
+
+    /**
+     * Creates a new FixedDonation entity from this.
+     */
+    public async toEntity(): Promise<DistanceDonation> {
+        let newDonation = new DistanceDonation;
+
+        newDonation.amountPerDistance = this.amountPerDistance;
+        newDonation.donor = await this.getDonor();
+        newDonation.runner = await this.getRunner();
+
+        return newDonation;
+    }
+
+    /**
+     * Gets a runner based on the runner id provided via this.runner.
+     */
+    public async getRunner(): Promise<Runner> {
+        const runner = await getConnection().getRepository(Runner).findOne({ id: this.runner });
+        if (!runner) {
+            throw new RunnerNotFoundError();
+        }
+        return runner;
+    }
+}