Refactor denormalize/unvisit.

Fixes gh-225

src/schemas/Array.js

@@ -23,7 +23,9 @@ export const normalize = (schema, input, parent, key, visit, addEntity) => {
 
 export const denormalize = (schema, input, unvisit, getDenormalizedEntity) => {
   schema = validateSchema(schema);
-  return input.map((entityOrId) => unvisit(entityOrId, schema, getDenormalizedEntity));
+  return Array.isArray(input) ?
+    input.map((entityOrId) => unvisit(entityOrId, schema, getDenormalizedEntity)) :
+    input;
 };
 
 export default class ArraySchema extends PolymorphicSchema {
@@ -35,6 +37,8 @@ export default class ArraySchema extends PolymorphicSchema {
   }
 
   denormalize(input, unvisit, getDenormalizedEntity) {
-    return input.map((value) => this.denormalizeValue(value, unvisit, getDenormalizedEntity));
+    return Array.isArray(input) ?
+      input.map((value) => this.denormalizeValue(value, unvisit, getDenormalizedEntity)) :
+      input;
   }
 }

src/schemas/Entity.js

@@ -1,5 +1,3 @@
-import { denormalize } from './Object';
-
 export default class EntitySchema {
   constructor(key, definition = {}, options = {}) {
     if (!key || typeof key !== 'string') {
@@ -16,7 +14,7 @@ export default class EntitySchema {
 
     this._key = key;
     this._getId = typeof idAttribute === 'function' ? idAttribute : (input) => input[idAttribute];
-    this._idAttribute = idAttribute
+    this._idAttribute = idAttribute;
     this._mergeStrategy = mergeStrategy;
     this._processStrategy = processStrategy;
     this.define(definition);
@@ -25,9 +23,9 @@ export default class EntitySchema {
   get key() {
     return this._key;
   }
-  
+
   get idAttribute() {
-    return this._idAttribute
+    return this._idAttribute;
   }
 
   define(definition) {
@@ -63,6 +61,14 @@ export default class EntitySchema {
     if (typeof entity !== 'object') {
       return entity;
     }
-    return denormalize(this.schema, entity, unvisit, getDenormalizedEntity);
+
+    const processedEntity = { ...entity };
+    Object.keys(this.schema).forEach((key) => {
+      if (processedEntity.hasOwnProperty(key)) {
+        const schema = this.schema[key];
+        processedEntity[key] = unvisit(processedEntity[key], schema, getDenormalizedEntity);
+      }
+    });
+    return processedEntity;
   }
 }

src/schemas/__tests__/Array.test.js

@@ -85,6 +85,21 @@ describe(`${schema.Array.name} denormalization`, () => {
       };
       expect(denormalize([ 1, 2 ], [ cats ], entities)).toMatchSnapshot();
     });
+
+    it('returns the input value if is not an array', () => {
+      const filling = new schema.Entity('fillings');
+      const taco = new schema.Entity('tacos', { fillings: [ filling ] });
+      const entities = {
+        tacos: {
+          '123': {
+            id: '123',
+            fillings: null
+          }
+        }
+      };
+
+      expect(denormalize('123', taco, entities)).toMatchSnapshot();
+    });
   });
 
   describe('Class', () => {
@@ -137,5 +152,21 @@ describe(`${schema.Array.name} denormalization`, () => {
 
       expect(denormalize(input, listSchema, entities)).toMatchSnapshot();
     });
+
+    it('returns the input value if is not an array', () => {
+      const filling = new schema.Entity('fillings');
+      const fillings = new schema.Array(filling);
+      const taco = new schema.Entity('tacos', { fillings });
+      const entities = {
+        tacos: {
+          '123': {
+            id: '123',
+            fillings: null
+          }
+        }
+      };
+
+      expect(denormalize('123', taco, entities)).toMatchSnapshot();
+    });
   });
 });

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

@@ -31,6 +31,13 @@ Array [
 ]
 `;
 
+exports[`ArraySchema denormalization Class returns the input value if is not an array 1`] = `
+Object {
+  "fillings": null,
+  "id": "123",
+}
+`;
+
 exports[`ArraySchema denormalization Object denormalizes a single entity 1`] = `
 Array [
   Object {
@@ -44,6 +51,13 @@ Array [
 ]
 `;
 
+exports[`ArraySchema denormalization Object returns the input value if is not an array 1`] = `
+Object {
+  "fillings": null,
+  "id": "123",
+}
+`;
+
 exports[`ArraySchema normalization Class filters out undefined and null normalized values 1`] = `
 Object {
   "entities": Object {