Fixed denormalization skipping of falsy valued ids used in Object schemas

src/schemas/Object.js

@@ -21,7 +21,7 @@ export const denormalize = (schema, input, unvisit) => {
 
   const object = { ...input };
   Object.keys(schema).forEach((key) => {
-    if (object[key]) {
+    if (object[key] != null) {
       object[key] = unvisit(object[key], schema[key]);
     }
   });

src/schemas/__tests__/Object.test.js

@@ -50,4 +50,19 @@ describe(`${schema.Object.name} denormalization`, () => {
     expect(denormalize({ user: 1 }, { user: userSchema, tacos: {} }, fromJS(entities))).toMatchSnapshot();
     expect(denormalize(fromJS({ user: 1 }), { user: userSchema, tacos: {} }, fromJS(entities))).toMatchSnapshot();
   });
+
+  test('denormalizes an object that contains a property representing a an object with an id of zero', () => {
+    const userSchema = new schema.Entity('user');
+    const object = new schema.Object({
+      user: userSchema
+    });
+    const entities = {
+      user: {
+        0: { id: 0, name: 'Chancho' }
+      }
+    };
+    expect(denormalize({ user: 0 }, object, entities)).toMatchSnapshot();
+    expect(denormalize({ user: 0 }, object, fromJS(entities))).toMatchSnapshot();
+    expect(denormalize(fromJS({ user: 0 }), object, fromJS(entities))).toMatchSnapshot();
+  });
 });

src/schemas/__tests__/__snapshots__/Object.test.js.snap

@@ -27,6 +27,33 @@ Immutable.Map {
 }
 `;
 
+exports[`ObjectSchema denormalization denormalizes an object that contains a property representing a an object with an id of zero 1`] = `
+Object {
+  "user": Object {
+    "id": 0,
+    "name": "Chancho",
+  },
+}
+`;
+
+exports[`ObjectSchema denormalization denormalizes an object that contains a property representing a an object with an id of zero 2`] = `
+Object {
+  "user": Immutable.Map {
+    "id": 0,
+    "name": "Chancho",
+  },
+}
+`;
+
+exports[`ObjectSchema denormalization denormalizes an object that contains a property representing a an object with an id of zero 3`] = `
+Immutable.Map {
+  "user": Immutable.Map {
+    "id": 0,
+    "name": "Chancho",
+  },
+}
+`;
+
 exports[`ObjectSchema denormalization denormalizes plain object shorthand 1`] = `
 Object {
   "user": Object {