feat: implement getFieldById method

src/models/Field.ts

@@ -0,0 +1,38 @@
+import { FieldStatus } from '../enums/FieldStatus';
+import { FieldType } from '../enums/FieldType';
+
+export class Field {
+  public id: number;
+  public appId: number;
+  public name: string;
+  public type: FieldType;
+  public status: FieldStatus;
+  public isRequired: boolean;
+  public isUnique: boolean;
+
+  public constructor(
+    id: number,
+    appId: number,
+    name: string,
+    type: string,
+    status: string,
+    isRequired: boolean,
+    isUnique: boolean
+  ) {
+    if (FieldType[type] === undefined) {
+      throw new Error(`The type '${type}' is not a valid FieldType.`);
+    }
+
+    if (FieldStatus[status] === undefined) {
+      throw new Error(`The status '${status}' is not a valid FieldStatus.`);
+    }
+
+    this.id = id;
+    this.appId = appId;
+    this.name = name;
+    this.type = FieldType[type];
+    this.status = FieldStatus[status];
+    this.isRequired = isRequired;
+    this.isUnique = isUnique;
+  }
+}