Fixed a bug in modeling, when receiving a sub model as ID with value 0, the value wouldn't get modeled.

lib/modeling/modeler.ts

@@ -213,7 +213,7 @@ export class Modeler {
 			entityFieldRawData = defaultValue;
 		}
 
-		if (entityFieldRawData && !(entityFieldRawData instanceof ModelBase)) {
+		if (entityFieldRawData !== undefined && entityFieldRawData !== null && !(entityFieldRawData instanceof ModelBase)) {
 			const fieldData$ = this.getSubModel<TData>(entityField, entityFieldRawData, options);
 			if (fieldData$)
 				return fieldData$;

test/mock/todo-status.entity.ts

@@ -3,6 +3,7 @@ import {EntityModelBase} from "../../lib/config/entity-model.base";
 import {EntityField} from "../../lib/config/decorators/entity-field.decorator";
 
 export const todoStatusValues = [
+	{ id: 0, name: 'Pending' },
 	{ id: 1, name: "Open" },
 	{ id: 2, name: "In progress" },
 	{ id: 3, name: "Done" },

test/modeling/modeler.spec.ts

@@ -14,6 +14,7 @@ import {Entity} from "../../lib/config/decorators/entity.decorator";
 import {EntityModelBase} from "../../lib/config/entity-model.base";
 import {Repository} from "../../lib/api/repository/repository";
 import {EntityField} from "../../lib/config/decorators/entity-field.decorator";
+import {TodoStatus} from "../mock/todo-status.entity";
 
 describe('Modeler', () => {
 	let paris: Paris;
@@ -96,6 +97,20 @@ describe('Modeler', () => {
 				done();
 			});
 		});
+
+		it("assigns a sub-model that has id === 0 from values", done => {
+			const todoRawData = {
+				id: 6,
+				text: 'Pending...',
+				time: 1534433193347,
+				status: 0
+			};
+
+			paris.modeler.modelEntity(todoRawData, todoEntityConfig).subscribe(todoItem => {
+				expect(todoItem.status).toBeInstanceOf(TodoStatus);
+				done();
+			});
+		});
 	});
 
 	describe('model configuration', () => {